CVE-2024-56548 (GCVE-0-2024-56548)
Vulnerability from cvelistv5
Published
2024-12-27 14:11
Modified
2026-08-05 11:44
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: hfsplus: don't query the device logical block size multiple times Devices block sizes may change. One of these cases is a loop device by using ioctl LOOP_SET_BLOCK_SIZE. While this may cause other issues like IO being rejected, in the case of hfsplus, it will allocate a block by using that size and potentially write out-of-bounds when hfsplus_read_wrapper calls hfsplus_submit_bio and the latter function reads a different io_size. Using a new min_io_size initally set to sb_min_blocksize works for the purposes of the original fix, since it will be set to the max between HFSPLUS_SECTOR_SIZE and the first seen logical block size. We still use the max between HFSPLUS_SECTOR_SIZE and min_io_size in case the latter is not initialized. Tested by mounting an hfsplus filesystem with loop block sizes 512, 1024 and 4096. The produced KASAN report before the fix looks like this: [ 419.944641] ================================================================== [ 419.945655] BUG: KASAN: slab-use-after-free in hfsplus_read_wrapper+0x659/0xa0a [ 419.946703] Read of size 2 at addr ffff88800721fc00 by task repro/10678 [ 419.947612] [ 419.947846] CPU: 0 UID: 0 PID: 10678 Comm: repro Not tainted 6.12.0-rc5-00008-gdf56e0f2f3ca #84 [ 419.949007] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 [ 419.950035] Call Trace: [ 419.950384] <TASK> [ 419.950676] dump_stack_lvl+0x57/0x78 [ 419.951212] ? hfsplus_read_wrapper+0x659/0xa0a [ 419.951830] print_report+0x14c/0x49e [ 419.952361] ? __virt_addr_valid+0x267/0x278 [ 419.952979] ? kmem_cache_debug_flags+0xc/0x1d [ 419.953561] ? hfsplus_read_wrapper+0x659/0xa0a [ 419.954231] kasan_report+0x89/0xb0 [ 419.954748] ? hfsplus_read_wrapper+0x659/0xa0a [ 419.955367] hfsplus_read_wrapper+0x659/0xa0a [ 419.955948] ? __pfx_hfsplus_read_wrapper+0x10/0x10 [ 419.956618] ? do_raw_spin_unlock+0x59/0x1a9 [ 419.957214] ? _raw_spin_unlock+0x1a/0x2e [ 419.957772] hfsplus_fill_super+0x348/0x1590 [ 419.958355] ? hlock_class+0x4c/0x109 [ 419.958867] ? __pfx_hfsplus_fill_super+0x10/0x10 [ 419.959499] ? __pfx_string+0x10/0x10 [ 419.960006] ? lock_acquire+0x3e2/0x454 [ 419.960532] ? bdev_name.constprop.0+0xce/0x243 [ 419.961129] ? __pfx_bdev_name.constprop.0+0x10/0x10 [ 419.961799] ? pointer+0x3f0/0x62f [ 419.962277] ? __pfx_pointer+0x10/0x10 [ 419.962761] ? vsnprintf+0x6c4/0xfba [ 419.963178] ? __pfx_vsnprintf+0x10/0x10 [ 419.963621] ? setup_bdev_super+0x376/0x3b3 [ 419.964029] ? snprintf+0x9d/0xd2 [ 419.964344] ? __pfx_snprintf+0x10/0x10 [ 419.964675] ? lock_acquired+0x45c/0x5e9 [ 419.965016] ? set_blocksize+0x139/0x1c1 [ 419.965381] ? sb_set_blocksize+0x6d/0xae [ 419.965742] ? __pfx_hfsplus_fill_super+0x10/0x10 [ 419.966179] mount_bdev+0x12f/0x1bf [ 419.966512] ? __pfx_mount_bdev+0x10/0x10 [ 419.966886] ? vfs_parse_fs_string+0xce/0x111 [ 419.967293] ? __pfx_vfs_parse_fs_string+0x10/0x10 [ 419.967702] ? __pfx_hfsplus_mount+0x10/0x10 [ 419.968073] legacy_get_tree+0x104/0x178 [ 419.968414] vfs_get_tree+0x86/0x296 [ 419.968751] path_mount+0xba3/0xd0b [ 419.969157] ? __pfx_path_mount+0x10/0x10 [ 419.969594] ? kmem_cache_free+0x1e2/0x260 [ 419.970311] do_mount+0x99/0xe0 [ 419.970630] ? __pfx_do_mount+0x10/0x10 [ 419.971008] __do_sys_mount+0x199/0x1c9 [ 419.971397] do_syscall_64+0xd0/0x135 [ 419.971761] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 419.972233] RIP: 0033:0x7c3cb812972e [ 419.972564] Code: 48 8b 0d f5 46 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c2 46 0d 00 f7 d8 64 89 01 48 [ 419.974371] RSP: 002b:00007ffe30632548 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 [ 419.975048] RAX: ffffffffffffffda RBX: 00007ffe306328d8 RCX: 00007c3cb812972e [ 419.975701] RDX: 0000000020000000 RSI: 0000000020000c80 RDI: ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: 6596528e391ad978a6a120142cba97a1d7324cb6
Version: c53c89aba3ebdfc3e9acdb18bb5ee9d2f8a328d0
Version: 3.0.8   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: don\u0027t query the device logical block size multiple times\n\nDevices block sizes may change. One of these cases is a loop device by\nusing ioctl LOOP_SET_BLOCK_SIZE.\n\nWhile this may cause other issues like IO being rejected, in the case of\nhfsplus, it will allocate a block by using that size and potentially write\nout-of-bounds when hfsplus_read_wrapper calls hfsplus_submit_bio and the\nlatter function reads a different io_size.\n\nUsing a new min_io_size initally set to sb_min_blocksize works for the\npurposes of the original fix, since it will be set to the max between\nHFSPLUS_SECTOR_SIZE and the first seen logical block size. We still use the\nmax between HFSPLUS_SECTOR_SIZE and min_io_size in case the latter is not\ninitialized.\n\nTested by mounting an hfsplus filesystem with loop block sizes 512, 1024\nand 4096.\n\nThe produced KASAN report before the fix looks like this:\n\n[  419.944641] ==================================================================\n[  419.945655] BUG: KASAN: slab-use-after-free in hfsplus_read_wrapper+0x659/0xa0a\n[  419.946703] Read of size 2 at addr ffff88800721fc00 by task repro/10678\n[  419.947612]\n[  419.947846] CPU: 0 UID: 0 PID: 10678 Comm: repro Not tainted 6.12.0-rc5-00008-gdf56e0f2f3ca #84\n[  419.949007] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\n[  419.950035] Call Trace:\n[  419.950384]  \u003cTASK\u003e\n[  419.950676]  dump_stack_lvl+0x57/0x78\n[  419.951212]  ? hfsplus_read_wrapper+0x659/0xa0a\n[  419.951830]  print_report+0x14c/0x49e\n[  419.952361]  ? __virt_addr_valid+0x267/0x278\n[  419.952979]  ? kmem_cache_debug_flags+0xc/0x1d\n[  419.953561]  ? hfsplus_read_wrapper+0x659/0xa0a\n[  419.954231]  kasan_report+0x89/0xb0\n[  419.954748]  ? hfsplus_read_wrapper+0x659/0xa0a\n[  419.955367]  hfsplus_read_wrapper+0x659/0xa0a\n[  419.955948]  ? __pfx_hfsplus_read_wrapper+0x10/0x10\n[  419.956618]  ? do_raw_spin_unlock+0x59/0x1a9\n[  419.957214]  ? _raw_spin_unlock+0x1a/0x2e\n[  419.957772]  hfsplus_fill_super+0x348/0x1590\n[  419.958355]  ? hlock_class+0x4c/0x109\n[  419.958867]  ? __pfx_hfsplus_fill_super+0x10/0x10\n[  419.959499]  ? __pfx_string+0x10/0x10\n[  419.960006]  ? lock_acquire+0x3e2/0x454\n[  419.960532]  ? bdev_name.constprop.0+0xce/0x243\n[  419.961129]  ? __pfx_bdev_name.constprop.0+0x10/0x10\n[  419.961799]  ? pointer+0x3f0/0x62f\n[  419.962277]  ? __pfx_pointer+0x10/0x10\n[  419.962761]  ? vsnprintf+0x6c4/0xfba\n[  419.963178]  ? __pfx_vsnprintf+0x10/0x10\n[  419.963621]  ? setup_bdev_super+0x376/0x3b3\n[  419.964029]  ? snprintf+0x9d/0xd2\n[  419.964344]  ? __pfx_snprintf+0x10/0x10\n[  419.964675]  ? lock_acquired+0x45c/0x5e9\n[  419.965016]  ? set_blocksize+0x139/0x1c1\n[  419.965381]  ? sb_set_blocksize+0x6d/0xae\n[  419.965742]  ? __pfx_hfsplus_fill_super+0x10/0x10\n[  419.966179]  mount_bdev+0x12f/0x1bf\n[  419.966512]  ? __pfx_mount_bdev+0x10/0x10\n[  419.966886]  ? vfs_parse_fs_string+0xce/0x111\n[  419.967293]  ? __pfx_vfs_parse_fs_string+0x10/0x10\n[  419.967702]  ? __pfx_hfsplus_mount+0x10/0x10\n[  419.968073]  legacy_get_tree+0x104/0x178\n[  419.968414]  vfs_get_tree+0x86/0x296\n[  419.968751]  path_mount+0xba3/0xd0b\n[  419.969157]  ? __pfx_path_mount+0x10/0x10\n[  419.969594]  ? kmem_cache_free+0x1e2/0x260\n[  419.970311]  do_mount+0x99/0xe0\n[  419.970630]  ? __pfx_do_mount+0x10/0x10\n[  419.971008]  __do_sys_mount+0x199/0x1c9\n[  419.971397]  do_syscall_64+0xd0/0x135\n[  419.971761]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[  419.972233] RIP: 0033:0x7c3cb812972e\n[  419.972564] Code: 48 8b 0d f5 46 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 8b 0d c2 46 0d 00 f7 d8 64 89 01 48\n[  419.974371] RSP: 002b:00007ffe30632548 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5\n[  419.975048] RAX: ffffffffffffffda RBX: 00007ffe306328d8 RCX: 00007c3cb812972e\n[  419.975701] RDX: 0000000020000000 RSI: 0000000020000c80 RDI:\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attack requires local access to issue the `mount()` syscall on an hfsplus image and a concurrent `LOOP_SET_BLOCK_SIZE` ioctl on the backing loop device. There is no remote or adjacent-network path into `hfsplus_read_wrapper()`.\nAC:L - Although this is a race, the attacker controls both sides \u2014 they initiate the mount and drive the block-size ioctl from another thread \u2014 and can retry indefinitely; the window spans `hfsplus_get_last_session()`, two kmallocs and full bio round-trips through the `reread:` path, making it wide and reliably winnable.\nPR:L - `LOOP_SET_BLOCK_SIZE` needs only a writable loop fd with no CAP_SYS_ADMIN check, and the mount side is reachable by a low-privileged local user on the many deployments that delegate mounting (udisks2/autofs removable-media automount on desktops, Android/ChromeOS external HFS+ media, containers granted CAP_SYS_ADMIN), matching the CNA\u0027s established scoring for hfsplus mount-path flaws.\nUI:N - The attacker performs both the loop-device setup/ioctl and the mount themselves; no action by a separate victim user is needed.\nS:U - The heap corruption occurs in kernel memory and is exploited within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `*data = (u8 *)buf + offset` is computed with the enlarged io_size, so `sbi-\u003es_vhdr`/`s_backup_vhdr` point outside the allocation and the code reads adjacent (including freed) slab memory, and the resulting slab corruption can be leveraged into a broader kernel-memory read primitive.\nI:H - The bio is built over up to PAGE_SIZE bytes starting at a 512-byte slab object, so the block read writes thousands of bytes of attacker-chosen loop backing-file content over neighbouring kmalloc objects \u2014 a controlled slab out-of-bounds write suitable for control-flow hijacking and privilege escalation.\nA:H - The out-of-bounds access reliably corrupts adjacent slab objects and triggers a KASAN slab-use-after-free/oops as shown in the commit log, readily causing a kernel panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:44:57.408Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/baccb5e12577b7a9eff54ffba301fdaa0f3ee5a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/f57725bcc5816425e25218fdf5fb6923bc578cdf"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8a2b1c1c2ea85e9a5a2d0c5a5a7e7c639feb866"
        },
        {
          "url": "https://git.kernel.org/stable/c/06cbfbb13ac88f4154c2eb4bc4176f9d10139847"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d7bda75e1a6239db053c73acde17ca146317824"
        },
        {
          "url": "https://git.kernel.org/stable/c/21900e8478126ff6afe3b66679f676e74d1f8830"
        },
        {
          "url": "https://git.kernel.org/stable/c/2667c9b7b76efcbc7adbfea249892f20c313b0da"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfeecda050aa9376f642d5b2a71c4112cc6c8216"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c82587cb57687de3f18ab4b98a8850c789bedcf"
        }
      ],
      "title": "hfsplus: don\u0027t query the device logical block size multiple times",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56548",
    "datePublished": "2024-12-27T14:11:29.373Z",
    "dateReserved": "2024-12-27T14:03:05.989Z",
    "dateUpdated": "2026-08-05T11:44:57.408Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T20:49:23.519Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-56548\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T20:02:19.622310Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T15:41:07.434Z\"}}], \"cna\": {\"title\": \"hfsplus: don\u0027t query the device logical block size multiple times\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"baccb5e12577b7a9eff54ffba301fdaa0f3ee5a8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"f57725bcc5816425e25218fdf5fb6923bc578cdf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"e8a2b1c1c2ea85e9a5a2d0c5a5a7e7c639feb866\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"06cbfbb13ac88f4154c2eb4bc4176f9d10139847\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"3d7bda75e1a6239db053c73acde17ca146317824\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"21900e8478126ff6afe3b66679f676e74d1f8830\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"2667c9b7b76efcbc7adbfea249892f20c313b0da\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"bfeecda050aa9376f642d5b2a71c4112cc6c8216\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6596528e391ad978a6a120142cba97a1d7324cb6\", \"lessThan\": \"1c82587cb57687de3f18ab4b98a8850c789bedcf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c53c89aba3ebdfc3e9acdb18bb5ee9d2f8a328d0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3.0.8\", \"lessThan\": \"3.1\", \"versionType\": \"semver\"}], \"programFiles\": [\"fs/hfsplus/hfsplus_fs.h\", \"fs/hfsplus/wrapper.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.1\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.325\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.287\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.231\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.174\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/hfsplus/hfsplus_fs.h\", \"fs/hfsplus/wrapper.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/baccb5e12577b7a9eff54ffba301fdaa0f3ee5a8\"}, {\"url\": \"https://git.kernel.org/stable/c/f57725bcc5816425e25218fdf5fb6923bc578cdf\"}, {\"url\": \"https://git.kernel.org/stable/c/e8a2b1c1c2ea85e9a5a2d0c5a5a7e7c639feb866\"}, {\"url\": \"https://git.kernel.org/stable/c/06cbfbb13ac88f4154c2eb4bc4176f9d10139847\"}, {\"url\": \"https://git.kernel.org/stable/c/3d7bda75e1a6239db053c73acde17ca146317824\"}, {\"url\": \"https://git.kernel.org/stable/c/21900e8478126ff6afe3b66679f676e74d1f8830\"}, {\"url\": \"https://git.kernel.org/stable/c/2667c9b7b76efcbc7adbfea249892f20c313b0da\"}, {\"url\": \"https://git.kernel.org/stable/c/bfeecda050aa9376f642d5b2a71c4112cc6c8216\"}, {\"url\": \"https://git.kernel.org/stable/c/1c82587cb57687de3f18ab4b98a8850c789bedcf\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nhfsplus: don\u0027t query the device logical block size multiple times\\n\\nDevices block sizes may change. One of these cases is a loop device by\\nusing ioctl LOOP_SET_BLOCK_SIZE.\\n\\nWhile this may cause other issues like IO being rejected, in the case of\\nhfsplus, it will allocate a block by using that size and potentially write\\nout-of-bounds when hfsplus_read_wrapper calls hfsplus_submit_bio and the\\nlatter function reads a different io_size.\\n\\nUsing a new min_io_size initally set to sb_min_blocksize works for the\\npurposes of the original fix, since it will be set to the max between\\nHFSPLUS_SECTOR_SIZE and the first seen logical block size. We still use the\\nmax between HFSPLUS_SECTOR_SIZE and min_io_size in case the latter is not\\ninitialized.\\n\\nTested by mounting an hfsplus filesystem with loop block sizes 512, 1024\\nand 4096.\\n\\nThe produced KASAN report before the fix looks like this:\\n\\n[  419.944641] ==================================================================\\n[  419.945655] BUG: KASAN: slab-use-after-free in hfsplus_read_wrapper+0x659/0xa0a\\n[  419.946703] Read of size 2 at addr ffff88800721fc00 by task repro/10678\\n[  419.947612]\\n[  419.947846] CPU: 0 UID: 0 PID: 10678 Comm: repro Not tainted 6.12.0-rc5-00008-gdf56e0f2f3ca #84\\n[  419.949007] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\\n[  419.950035] Call Trace:\\n[  419.950384]  \u003cTASK\u003e\\n[  419.950676]  dump_stack_lvl+0x57/0x78\\n[  419.951212]  ? hfsplus_read_wrapper+0x659/0xa0a\\n[  419.951830]  print_report+0x14c/0x49e\\n[  419.952361]  ? __virt_addr_valid+0x267/0x278\\n[  419.952979]  ? kmem_cache_debug_flags+0xc/0x1d\\n[  419.953561]  ? hfsplus_read_wrapper+0x659/0xa0a\\n[  419.954231]  kasan_report+0x89/0xb0\\n[  419.954748]  ? hfsplus_read_wrapper+0x659/0xa0a\\n[  419.955367]  hfsplus_read_wrapper+0x659/0xa0a\\n[  419.955948]  ? __pfx_hfsplus_read_wrapper+0x10/0x10\\n[  419.956618]  ? do_raw_spin_unlock+0x59/0x1a9\\n[  419.957214]  ? _raw_spin_unlock+0x1a/0x2e\\n[  419.957772]  hfsplus_fill_super+0x348/0x1590\\n[  419.958355]  ? hlock_class+0x4c/0x109\\n[  419.958867]  ? __pfx_hfsplus_fill_super+0x10/0x10\\n[  419.959499]  ? __pfx_string+0x10/0x10\\n[  419.960006]  ? lock_acquire+0x3e2/0x454\\n[  419.960532]  ? bdev_name.constprop.0+0xce/0x243\\n[  419.961129]  ? __pfx_bdev_name.constprop.0+0x10/0x10\\n[  419.961799]  ? pointer+0x3f0/0x62f\\n[  419.962277]  ? __pfx_pointer+0x10/0x10\\n[  419.962761]  ? vsnprintf+0x6c4/0xfba\\n[  419.963178]  ? __pfx_vsnprintf+0x10/0x10\\n[  419.963621]  ? setup_bdev_super+0x376/0x3b3\\n[  419.964029]  ? snprintf+0x9d/0xd2\\n[  419.964344]  ? __pfx_snprintf+0x10/0x10\\n[  419.964675]  ? lock_acquired+0x45c/0x5e9\\n[  419.965016]  ? set_blocksize+0x139/0x1c1\\n[  419.965381]  ? sb_set_blocksize+0x6d/0xae\\n[  419.965742]  ? __pfx_hfsplus_fill_super+0x10/0x10\\n[  419.966179]  mount_bdev+0x12f/0x1bf\\n[  419.966512]  ? __pfx_mount_bdev+0x10/0x10\\n[  419.966886]  ? vfs_parse_fs_string+0xce/0x111\\n[  419.967293]  ? __pfx_vfs_parse_fs_string+0x10/0x10\\n[  419.967702]  ? __pfx_hfsplus_mount+0x10/0x10\\n[  419.968073]  legacy_get_tree+0x104/0x178\\n[  419.968414]  vfs_get_tree+0x86/0x296\\n[  419.968751]  path_mount+0xba3/0xd0b\\n[  419.969157]  ? __pfx_path_mount+0x10/0x10\\n[  419.969594]  ? kmem_cache_free+0x1e2/0x260\\n[  419.970311]  do_mount+0x99/0xe0\\n[  419.970630]  ? __pfx_do_mount+0x10/0x10\\n[  419.971008]  __do_sys_mount+0x199/0x1c9\\n[  419.971397]  do_syscall_64+0xd0/0x135\\n[  419.971761]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n[  419.972233] RIP: 0033:0x7c3cb812972e\\n[  419.972564] Code: 48 8b 0d f5 46 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 8b 0d c2 46 0d 00 f7 d8 64 89 01 48\\n[  419.974371] RSP: 002b:00007ffe30632548 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5\\n[  419.975048] RAX: ffffffffffffffda RBX: 00007ffe306328d8 RCX: 00007c3cb812972e\\n[  419.975701] RDX: 0000000020000000 RSI: 0000000020000c80 RDI:\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.325\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.287\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.231\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.174\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.120\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.64\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.11\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.2\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.0.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:55:37.481Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-56548\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:55:37.481Z\", \"dateReserved\": \"2024-12-27T14:03:05.989Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-27T14:11:29.373Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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