{"api_version":"1","generated_at":"2026-10-09T11:43:27+00:00","cve":"CVE-2026-98259","urls":{"html":"https://cve.report/CVE-2026-98259","api":"https://cve.report/api/cve/CVE-2026-98259.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98259","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98259"},"summary":{"title":"fs/dax: check zero or empty entry before converting xarray entry","description":"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't 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","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-06 09:18:14","updated_at":"2026-10-06 09:18:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/44ab7420ab52ab6c04bf225cac7c5c007cedd6c7","name":"https://git.kernel.org/stable/c/44ab7420ab52ab6c04bf225cac7c5c007cedd6c7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/185cd2f5fe1e3319853cf065905b2885ad0bcbf8","name":"https://git.kernel.org/stable/c/185cd2f5fe1e3319853cf065905b2885ad0bcbf8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8e2b8614039853e68d5338e37821e8bcee9fc05f","name":"https://git.kernel.org/stable/c/8e2b8614039853e68d5338e37821e8bcee9fc05f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98259","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98259","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 38607c62b34b46317c46d5baf1df03ac6e48a1c6 44ab7420ab52ab6c04bf225cac7c5c007cedd6c7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 38607c62b34b46317c46d5baf1df03ac6e48a1c6 185cd2f5fe1e3319853cf065905b2885ad0bcbf8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 38607c62b34b46317c46d5baf1df03ac6e48a1c6 8e2b8614039853e68d5338e37821e8bcee9fc05f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.54 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.8 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"98259","cve":"CVE-2026-98259","epss":"0.002060000","percentile":"0.097690000","score_date":"2026-10-06","updated_at":"2026-10-07 00:14:55"},"legacy_qids":[]},"source_records":{"cve_program":{"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-rc4","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-rc4","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't 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":"2026-10-06T08:45:24.031Z","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":"2026-10-06T08:45:24.031Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-06 09:18:14","lastModifiedDate":"2026-10-06 09:18:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98259","Ordinal":"1","Title":"fs/dax: check zero or empty entry before converting xarray entry","CVE":"CVE-2026-98259","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98259","Ordinal":"1","NoteData":"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't 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","Type":"Description","Title":"fs/dax: check zero or empty entry before converting xarray entry"}]}}}