CVE-2026-98259 (GCVE-0-2026-98259)
Vulnerability from cvelistv5
Published
2026-10-06 08:45
Modified
2026-10-19 09:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/dax: check zero or empty entry before converting xarray entry Calling dax_to_folio() with empty entry causes kernel panic below when booting a VM with DAX enabled storage. This patch checks empty entry before calling dax_to_folio() on dax_associate_entry(), dax_disassociate_entry(), and dax_busy_page(). Commit 98c183a4fccf ("fs/dax: don't disassociate zero page entries") added guards in the associate and disassociate paths, but the guards still come after dax_to_folio(), and dax_busy_page() still has the same problem. [ 0.737679] EXT4-fs (pmem0p1): mounted filesystem 79676804-7c8b-491a-b2a6-9bae3c72af70 ro with ordered data mode. Quota mode: disabled. [ 0.737891] VFS: Mounted root (ext4 filesystem) readonly on device 259:1. [ 0.739119] devtmpfs: mounted [ 0.739476] Freeing unused kernel memory: 1920K [ 0.740156] Run /sbin/init as init process [ 0.740229] with arguments: [ 0.740286] /sbin/init [ 0.740321] with environment: [ 0.740369] HOME=/ [ 0.740400] TERM=linux [ 0.743162] Unable to handle kernel paging request at virtual address fffffdffbf000008 [ 0.743285] Mem abort info: [ 0.743316] ESR = 0x0000000096000006 [ 0.743371] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.743444] SET = 0, FnV = 0 [ 0.743489] EA = 0, S1PTW = 0 [ 0.743545] FSC = 0x06: level 2 translation fault [ 0.743610] Data abort info: [ 0.743656] ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 [ 0.743720] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 0.743785] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 0.743848] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000b9d17000 [ 0.743931] [fffffdffbf000008] pgd=10000000bfa3d403, p4d=10000000bfa3d403, pud=1000000040bfe403, pmd=0000000000000000 [ 0.744070] Internal error: Oops: 0000000096000006 [#1] SMP [ 0.748888] CPU: 0 UID: 0 PID: 1 Comm: init Not tainted 6.18.4 #1 NONE [ 0.749421] pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 0.749969] pc : dax_disassociate_entry.constprop.0+0x20/0x50 [ 0.750444] lr : dax_insert_entry+0xcc/0x408 [ 0.750802] sp : ffff80008000b9e0 [ 0.751083] x29: ffff80008000b9e0 x28: 0000000000000000 x27: 0000000000000000 [ 0.751682] x26: 0000000001963d01 x25: ffff0000004f7d90 x24: 0000000000000000 [ 0.752264] x23: 0000000000000000 x22: ffff80008000bcc8 x21: 0000000000000011 [ 0.752836] x20: ffff80008000ba90 x19: 0000000001963d01 x18: 0000000000000000 [ 0.753407] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [ 0.753970] x14: ffffbf3154b9ae70 x13: 0000000000000000 x12: ffffbf3154b9ae70 [ 0.754548] x11: ffffffffffffffff x10: 0000000000000000 x9 : 0000000000000000 [ 0.755122] x8 : 000000000000000d x7 : 000000000000001f x6 : 0000000000000000 [ 0.755707] x5 : 0000000000000000 x4 : 0000000000000000 x3 : fffffdffc0000000 [ 0.756287] x2 : 0000000000000008 x1 : 0000000040000000 x0 : fffffdffbf000000 [ 0.756871] Call trace: [ 0.757107] dax_disassociate_entry.constprop.0+0x20/0x50 (P) [ 0.757592] dax_iomap_pte_fault+0x4fc/0x808 [ 0.757951] dax_iomap_fault+0x28/0x30 [ 0.758258] ext4_dax_huge_fault+0x80/0x2dc [ 0.758594] ext4_dax_fault+0x10/0x3c [ 0.758892] __do_fault+0x38/0x12c [ 0.759175] __handle_mm_fault+0x530/0xcf0 [ 0.759518] handle_mm_fault+0xe4/0x230 [ 0.759833] do_page_fault+0x17c/0x4dc [ 0.760144] do_translation_fault+0x30/0x38 [ 0.760483] do_mem_abort+0x40/0x8c [ 0.760771] el0_ia+0x4c/0x170 [ 0.761032] el0t_64_sync_handler+0xd8/0xdc [ 0.761371] el0t_64_sync+0x168/0x16c [ 0.761677] Code: f9453021 f2dfbfe3 cb813080 8b001860 (f9400401) [ 0.762168] ---[ end trace 0000000000000000 ]--- [ 0.762550] note: init[1] exited with irqs disabled [ 0.762631] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
References
Impacted products
Vendor Product Version
Linux Linux Version: 38607c62b34b46317c46d5baf1df03ac6e48a1c6
Version: 38607c62b34b46317c46d5baf1df03ac6e48a1c6
Version: 38607c62b34b46317c46d5baf1df03ac6e48a1c6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/dax.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "44ab7420ab52ab6c04bf225cac7c5c007cedd6c7",
              "status": "affected",
              "version": "38607c62b34b46317c46d5baf1df03ac6e48a1c6",
              "versionType": "git"
            },
            {
              "lessThan": "185cd2f5fe1e3319853cf065905b2885ad0bcbf8",
              "status": "affected",
              "version": "38607c62b34b46317c46d5baf1df03ac6e48a1c6",
              "versionType": "git"
            },
            {
              "lessThan": "8e2b8614039853e68d5338e37821e8bcee9fc05f",
              "status": "affected",
              "version": "38607c62b34b46317c46d5baf1df03ac6e48a1c6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/dax.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.54",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/dax: check zero or empty entry before converting xarray entry\n\nCalling dax_to_folio() with empty entry causes kernel panic below when\nbooting a VM with DAX enabled storage.\n\nThis patch checks empty entry before calling dax_to_folio() on\ndax_associate_entry(), dax_disassociate_entry(), and dax_busy_page().\n\nCommit 98c183a4fccf (\"fs/dax: don\u0027t disassociate zero page entries\") added\nguards in the associate and disassociate paths, but the guards still come\nafter dax_to_folio(), and dax_busy_page() still has the same problem.\n\n[    0.737679] EXT4-fs (pmem0p1): mounted filesystem 79676804-7c8b-491a-b2a6-9bae3c72af70 ro with ordered data mode. Quota mode: disabled.\n[    0.737891] VFS: Mounted root (ext4 filesystem) readonly on device 259:1.\n[    0.739119] devtmpfs: mounted\n[    0.739476] Freeing unused kernel memory: 1920K\n[    0.740156] Run /sbin/init as init process\n[    0.740229]   with arguments:\n[    0.740286]     /sbin/init\n[    0.740321]   with environment:\n[    0.740369]     HOME=/\n[    0.740400]     TERM=linux\n[    0.743162] Unable to handle kernel paging request at virtual address fffffdffbf000008\n[    0.743285] Mem abort info:\n[    0.743316]   ESR = 0x0000000096000006\n[    0.743371]   EC = 0x25: DABT (current EL), IL = 32 bits\n[    0.743444]   SET = 0, FnV = 0\n[    0.743489]   EA = 0, S1PTW = 0\n[    0.743545]   FSC = 0x06: level 2 translation fault\n[    0.743610] Data abort info:\n[    0.743656]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000\n[    0.743720]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[    0.743785]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[    0.743848] swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000000b9d17000\n[    0.743931] [fffffdffbf000008] pgd=10000000bfa3d403, p4d=10000000bfa3d403, pud=1000000040bfe403, pmd=0000000000000000\n[    0.744070] Internal error: Oops: 0000000096000006 [#1]  SMP\n[    0.748888] CPU: 0 UID: 0 PID: 1 Comm: init Not tainted 6.18.4 #1 NONE\n[    0.749421] pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[    0.749969] pc : dax_disassociate_entry.constprop.0+0x20/0x50\n[    0.750444] lr : dax_insert_entry+0xcc/0x408\n[    0.750802] sp : ffff80008000b9e0\n[    0.751083] x29: ffff80008000b9e0 x28: 0000000000000000 x27: 0000000000000000\n[    0.751682] x26: 0000000001963d01 x25: ffff0000004f7d90 x24: 0000000000000000\n[    0.752264] x23: 0000000000000000 x22: ffff80008000bcc8 x21: 0000000000000011\n[    0.752836] x20: ffff80008000ba90 x19: 0000000001963d01 x18: 0000000000000000\n[    0.753407] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000\n[    0.753970] x14: ffffbf3154b9ae70 x13: 0000000000000000 x12: ffffbf3154b9ae70\n[    0.754548] x11: ffffffffffffffff x10: 0000000000000000 x9 : 0000000000000000\n[    0.755122] x8 : 000000000000000d x7 : 000000000000001f x6 : 0000000000000000\n[    0.755707] x5 : 0000000000000000 x4 : 0000000000000000 x3 : fffffdffc0000000\n[    0.756287] x2 : 0000000000000008 x1 : 0000000040000000 x0 : fffffdffbf000000\n[    0.756871] Call trace:\n[    0.757107]  dax_disassociate_entry.constprop.0+0x20/0x50 (P)\n[    0.757592]  dax_iomap_pte_fault+0x4fc/0x808\n[    0.757951]  dax_iomap_fault+0x28/0x30\n[    0.758258]  ext4_dax_huge_fault+0x80/0x2dc\n[    0.758594]  ext4_dax_fault+0x10/0x3c\n[    0.758892]  __do_fault+0x38/0x12c\n[    0.759175]  __handle_mm_fault+0x530/0xcf0\n[    0.759518]  handle_mm_fault+0xe4/0x230\n[    0.759833]  do_page_fault+0x17c/0x4dc\n[    0.760144]  do_translation_fault+0x30/0x38\n[    0.760483]  do_mem_abort+0x40/0x8c\n[    0.760771]  el0_ia+0x4c/0x170\n[    0.761032]  el0t_64_sync_handler+0xd8/0xdc\n[    0.761371]  el0t_64_sync+0x168/0x16c\n[    0.761677] Code: f9453021 f2dfbfe3 cb813080 8b001860 (f9400401)\n[    0.762168] ---[ end trace 0000000000000000 ]---\n[    0.762550] note: init[1] exited with irqs disabled\n[    0.762631] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:16:30.392Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/44ab7420ab52ab6c04bf225cac7c5c007cedd6c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/185cd2f5fe1e3319853cf065905b2885ad0bcbf8"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e2b8614039853e68d5338e37821e8bcee9fc05f"
        }
      ],
      "title": "fs/dax: check zero or empty entry before converting xarray entry",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98259",
    "datePublished": "2026-10-06T08:45:24.031Z",
    "dateReserved": "2026-09-25T10:25:14.332Z",
    "dateUpdated": "2026-10-19T09:16:30.392Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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