CVE-2024-35979 (GCVE-0-2024-35979)
Vulnerability from cvelistv5
Published
2024-05-20 09:42
Modified
2026-08-05 11:31
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: raid1: fix use-after-free for original bio in raid1_write_request() r1_bio->bios[] is used to record new bios that will be issued to underlying disks, however, in raid1_write_request(), r1_bio->bios[] will set to the original bio temporarily. Meanwhile, if blocked rdev is set, free_r1bio() will be called causing that all r1_bio->bios[] to be freed: raid1_write_request() r1_bio = alloc_r1bio(mddev, bio); -> r1_bio->bios[] is NULL for (i = 0; i < disks; i++) -> for each rdev in conf // first rdev is normal r1_bio->bios[0] = bio; -> set to original bio // second rdev is blocked if (test_bit(Blocked, &rdev->flags)) break if (blocked_rdev) free_r1bio() put_all_bios() bio_put(r1_bio->bios[0]) -> original bio is freed Test scripts: mdadm -CR /dev/md0 -l1 -n4 /dev/sd[abcd] --assume-clean fio -filename=/dev/md0 -ioengine=libaio -rw=write -bs=4k -numjobs=1 \ -iodepth=128 -name=test -direct=1 echo blocked > /sys/block/md0/md/rd2/state Test result: BUG bio-264 (Not tainted): Object already free ----------------------------------------------------------------------------- Allocated in mempool_alloc_slab+0x24/0x50 age=1 cpu=1 pid=869 kmem_cache_alloc+0x324/0x480 mempool_alloc_slab+0x24/0x50 mempool_alloc+0x6e/0x220 bio_alloc_bioset+0x1af/0x4d0 blkdev_direct_IO+0x164/0x8a0 blkdev_write_iter+0x309/0x440 aio_write+0x139/0x2f0 io_submit_one+0x5ca/0xb70 __do_sys_io_submit+0x86/0x270 __x64_sys_io_submit+0x22/0x30 do_syscall_64+0xb1/0x210 entry_SYSCALL_64_after_hwframe+0x6c/0x74 Freed in mempool_free_slab+0x1f/0x30 age=1 cpu=1 pid=869 kmem_cache_free+0x28c/0x550 mempool_free_slab+0x1f/0x30 mempool_free+0x40/0x100 bio_free+0x59/0x80 bio_put+0xf0/0x220 free_r1bio+0x74/0xb0 raid1_make_request+0xadf/0x1150 md_handle_request+0xc7/0x3b0 md_submit_bio+0x76/0x130 __submit_bio+0xd8/0x1d0 submit_bio_noacct_nocheck+0x1eb/0x5c0 submit_bio_noacct+0x169/0xd40 submit_bio+0xee/0x1d0 blkdev_direct_IO+0x322/0x8a0 blkdev_write_iter+0x309/0x440 aio_write+0x139/0x2f0 Since that bios for underlying disks are not allocated yet, fix this problem by using mempool_free() directly to free the r1_bio.
References
Impacted products
Vendor Product Version
Linux Linux Version: 992db13a4aee766c8bfbf046ad15c2db5fa7cab8
Version: 992db13a4aee766c8bfbf046ad15c2db5fa7cab8
Version: 992db13a4aee766c8bfbf046ad15c2db5fa7cab8
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nraid1: fix use-after-free for original bio in raid1_write_request()\n\nr1_bio-\u003ebios[] is used to record new bios that will be issued to\nunderlying disks, however, in raid1_write_request(), r1_bio-\u003ebios[]\nwill set to the original bio temporarily. Meanwhile, if blocked rdev\nis set, free_r1bio() will be called causing that all r1_bio-\u003ebios[]\nto be freed:\n\nraid1_write_request()\n r1_bio = alloc_r1bio(mddev, bio); -\u003e r1_bio-\u003ebios[] is NULL\n for (i = 0;  i \u003c disks; i++) -\u003e for each rdev in conf\n  // first rdev is normal\n  r1_bio-\u003ebios[0] = bio; -\u003e set to original bio\n  // second rdev is blocked\n  if (test_bit(Blocked, \u0026rdev-\u003eflags))\n   break\n\n if (blocked_rdev)\n  free_r1bio()\n   put_all_bios()\n    bio_put(r1_bio-\u003ebios[0]) -\u003e original bio is freed\n\nTest scripts:\n\nmdadm -CR /dev/md0 -l1 -n4 /dev/sd[abcd] --assume-clean\nfio -filename=/dev/md0 -ioengine=libaio -rw=write -bs=4k -numjobs=1 \\\n    -iodepth=128 -name=test -direct=1\necho blocked \u003e /sys/block/md0/md/rd2/state\n\nTest result:\n\nBUG bio-264 (Not tainted): Object already free\n-----------------------------------------------------------------------------\n\nAllocated in mempool_alloc_slab+0x24/0x50 age=1 cpu=1 pid=869\n kmem_cache_alloc+0x324/0x480\n mempool_alloc_slab+0x24/0x50\n mempool_alloc+0x6e/0x220\n bio_alloc_bioset+0x1af/0x4d0\n blkdev_direct_IO+0x164/0x8a0\n blkdev_write_iter+0x309/0x440\n aio_write+0x139/0x2f0\n io_submit_one+0x5ca/0xb70\n __do_sys_io_submit+0x86/0x270\n __x64_sys_io_submit+0x22/0x30\n do_syscall_64+0xb1/0x210\n entry_SYSCALL_64_after_hwframe+0x6c/0x74\nFreed in mempool_free_slab+0x1f/0x30 age=1 cpu=1 pid=869\n kmem_cache_free+0x28c/0x550\n mempool_free_slab+0x1f/0x30\n mempool_free+0x40/0x100\n bio_free+0x59/0x80\n bio_put+0xf0/0x220\n free_r1bio+0x74/0xb0\n raid1_make_request+0xadf/0x1150\n md_handle_request+0xc7/0x3b0\n md_submit_bio+0x76/0x130\n __submit_bio+0xd8/0x1d0\n submit_bio_noacct_nocheck+0x1eb/0x5c0\n submit_bio_noacct+0x169/0xd40\n submit_bio+0xee/0x1d0\n blkdev_direct_IO+0x322/0x8a0\n blkdev_write_iter+0x309/0x440\n aio_write+0x139/0x2f0\n\nSince that bios for underlying disks are not allocated yet, fix this\nproblem by using mempool_free() directly to free the r1_bio."
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              "value": "AV:L - The bug is in the md/raid1 block driver and is reached only through local I/O submission \u2014 a write to /dev/mdX (O_DIRECT/AIO/io_uring) or to a filesystem hosted on the array \u2014 via md_submit_bio() \u2192 md_handle_request() \u2192 raid1_make_request() \u2192 raid1_write_request(). No remote or network protocol reaches this code.\nAC:L - Once any member rdev carries the Blocked/BlockedBadBlocks flag (set by raid1_error() on a failing member, by an unacknowledged bad block, or by a one-line sysfs write), every subsequent write to the array deterministically takes the blocked_rdev path and calls free_r1bio() on an r1bio whose bios[] entries still alias the caller\u0027s original bio \u2014 no race must be won, and the upstream reproducer triggers it reliably on the first write batch.\nPR:L - The freed object is the submitting task\u0027s own bio, and any unprivileged user who can write to a file on a raid1-backed filesystem (or to the array device) supplies the bio that gets prematurely bio_put()\u0027d; no capability is checked anywhere on md_submit_bio() \u2192 raid1_write_request(), and the Blocked state is ordinary array state rather than a privilege the attacker must hold.\nUI:N - The attacker\u0027s own write syscalls drive the entire path; no action by another user or administrator is needed at exploitation time.\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The original bio is returned to its bioset mempool and then kept in use as r1_bio-\u003emaster_bio: it is re-read by init_r1bio(), bio_split()/bio_chain(), and bio_alloc_clone(), which copies bi_bdev, bi_iter and the bi_io_vec pointer out of freed memory \u2014 after reallocation with attacker-sprayed data this yields disk I/O into or out of attacker-chosen kernel memory, an arbitrary-read primitive.\nI:H - md_wait_for_blocked_rdev() sleeps with the freed bio still referenced, giving an unbounded window to reclaim the slab object; the clones built from it write attacker-controlled vectors, and call_bio_endio() finally invokes bio-\u003ebi_end_io from freed memory, giving a function-pointer hijack plus a double-free when the original submitter completes the same bio.\nA:H - This is a use-after-free/double-free on a mempool-backed slab object that KASAN/SLUB flags as \"Object already free\"; in practice it panics the kernel or corrupts the block layer\u0027s bio state, taking the storage stack and the machine down."
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3f28d49a328fe20926995d5fbdc92da665596268\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/f423f41b7679c09abb26d2bd54be5cbef23c9446\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/fcf3f7e2fc8a53a6140beee46ec782a4c88e4744\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T03:21:49.042Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-35979\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-17T17:38:14.409469Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T17:38:15.563Z\"}}], \"cna\": {\"title\": \"raid1: fix use-after-free for original bio in raid1_write_request()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The bug is in the md/raid1 block driver and is reached only through local I/O submission \\u2014 a write to /dev/mdX (O_DIRECT/AIO/io_uring) or to a filesystem hosted on the array \\u2014 via md_submit_bio() \\u2192 md_handle_request() \\u2192 raid1_make_request() \\u2192 raid1_write_request(). No remote or network protocol reaches this code.\\nAC:L - Once any member rdev carries the Blocked/BlockedBadBlocks flag (set by raid1_error() on a failing member, by an unacknowledged bad block, or by a one-line sysfs write), every subsequent write to the array deterministically takes the blocked_rdev path and calls free_r1bio() on an r1bio whose bios[] entries still alias the caller\u0027s original bio \\u2014 no race must be won, and the upstream reproducer triggers it reliably on the first write batch.\\nPR:L - The freed object is the submitting task\u0027s own bio, and any unprivileged user who can write to a file on a raid1-backed filesystem (or to the array device) supplies the bio that gets prematurely bio_put()\u0027d; no capability is checked anywhere on md_submit_bio() \\u2192 raid1_write_request(), and the Blocked state is ordinary array state rather than a privilege the attacker must hold.\\nUI:N - The attacker\u0027s own write syscalls drive the entire path; no action by another user or administrator is needed at exploitation time.\\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The original bio is returned to its bioset mempool and then kept in use as r1_bio-\u003emaster_bio: it is re-read by init_r1bio(), bio_split()/bio_chain(), and bio_alloc_clone(), which copies bi_bdev, bi_iter and the bi_io_vec pointer out of freed memory \\u2014 after reallocation with attacker-sprayed data this yields disk I/O into or out of attacker-chosen kernel memory, an arbitrary-read primitive.\\nI:H - md_wait_for_blocked_rdev() sleeps with the freed bio still referenced, giving an unbounded window to reclaim the slab object; the clones built from it write attacker-controlled vectors, and call_bio_endio() finally invokes bio-\u003ebi_end_io from freed memory, giving a function-pointer hijack plus a double-free when the original submitter completes the same bio.\\nA:H - This is a use-after-free/double-free on a mempool-backed slab object that KASAN/SLUB flags as \\\"Object already free\\\"; in practice it panics the kernel or corrupts the block layer\u0027s bio state, taking the storage stack and the machine down.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"992db13a4aee766c8bfbf046ad15c2db5fa7cab8\", \"lessThan\": \"3f28d49a328fe20926995d5fbdc92da665596268\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"992db13a4aee766c8bfbf046ad15c2db5fa7cab8\", \"lessThan\": \"f423f41b7679c09abb26d2bd54be5cbef23c9446\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"992db13a4aee766c8bfbf046ad15c2db5fa7cab8\", \"lessThan\": \"fcf3f7e2fc8a53a6140beee46ec782a4c88e4744\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/md/raid1.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.28\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/md/raid1.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3f28d49a328fe20926995d5fbdc92da665596268\"}, {\"url\": \"https://git.kernel.org/stable/c/f423f41b7679c09abb26d2bd54be5cbef23c9446\"}, {\"url\": \"https://git.kernel.org/stable/c/fcf3f7e2fc8a53a6140beee46ec782a4c88e4744\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nraid1: fix use-after-free for original bio in raid1_write_request()\\n\\nr1_bio-\u003ebios[] is used to record new bios that will be issued to\\nunderlying disks, however, in raid1_write_request(), r1_bio-\u003ebios[]\\nwill set to the original bio temporarily. Meanwhile, if blocked rdev\\nis set, free_r1bio() will be called causing that all r1_bio-\u003ebios[]\\nto be freed:\\n\\nraid1_write_request()\\n r1_bio = alloc_r1bio(mddev, bio); -\u003e r1_bio-\u003ebios[] is NULL\\n for (i = 0;  i \u003c disks; i++) -\u003e for each rdev in conf\\n  // first rdev is normal\\n  r1_bio-\u003ebios[0] = bio; -\u003e set to original bio\\n  // second rdev is blocked\\n  if (test_bit(Blocked, \u0026rdev-\u003eflags))\\n   break\\n\\n if (blocked_rdev)\\n  free_r1bio()\\n   put_all_bios()\\n    bio_put(r1_bio-\u003ebios[0]) -\u003e original bio is freed\\n\\nTest scripts:\\n\\nmdadm -CR /dev/md0 -l1 -n4 /dev/sd[abcd] --assume-clean\\nfio -filename=/dev/md0 -ioengine=libaio -rw=write -bs=4k -numjobs=1 \\\\\\n    -iodepth=128 -name=test -direct=1\\necho blocked \u003e /sys/block/md0/md/rd2/state\\n\\nTest result:\\n\\nBUG bio-264 (Not tainted): Object already free\\n-----------------------------------------------------------------------------\\n\\nAllocated in mempool_alloc_slab+0x24/0x50 age=1 cpu=1 pid=869\\n kmem_cache_alloc+0x324/0x480\\n mempool_alloc_slab+0x24/0x50\\n mempool_alloc+0x6e/0x220\\n bio_alloc_bioset+0x1af/0x4d0\\n blkdev_direct_IO+0x164/0x8a0\\n blkdev_write_iter+0x309/0x440\\n aio_write+0x139/0x2f0\\n io_submit_one+0x5ca/0xb70\\n __do_sys_io_submit+0x86/0x270\\n __x64_sys_io_submit+0x22/0x30\\n do_syscall_64+0xb1/0x210\\n entry_SYSCALL_64_after_hwframe+0x6c/0x74\\nFreed in mempool_free_slab+0x1f/0x30 age=1 cpu=1 pid=869\\n kmem_cache_free+0x28c/0x550\\n mempool_free_slab+0x1f/0x30\\n mempool_free+0x40/0x100\\n bio_free+0x59/0x80\\n bio_put+0xf0/0x220\\n free_r1bio+0x74/0xb0\\n raid1_make_request+0xadf/0x1150\\n md_handle_request+0xc7/0x3b0\\n md_submit_bio+0x76/0x130\\n __submit_bio+0xd8/0x1d0\\n submit_bio_noacct_nocheck+0x1eb/0x5c0\\n submit_bio_noacct+0x169/0xd40\\n submit_bio+0xee/0x1d0\\n blkdev_direct_IO+0x322/0x8a0\\n blkdev_write_iter+0x309/0x440\\n aio_write+0x139/0x2f0\\n\\nSince that bios for underlying disks are not allocated yet, fix this\\nproblem by using mempool_free() directly to free the r1_bio.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.28\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.7\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:31:21.769Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35979\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:31:21.769Z\", \"dateReserved\": \"2024-05-17T13:50:33.144Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-20T09:42:04.424Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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