CVE-2026-53392

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53392", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.402Z", "datePublished": "2026-07-19T12:01:56.101Z", "dateUpdated": "2026-10-19T20:07:46.094Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:50:43.747Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4/flexfiles: reject zero filehandle version count\n\nff_layout_alloc_lseg() decodes the filehandle-version array count\nfrom the flexfiles layout body. The value is used as the count for\nkzalloc_objs(), and the current code only rejects NULL.\n\nA zero count yields ZERO_SIZE_PTR, which can be stored in\ndss_info->fh_versions even though later flexfiles paths assume that at\nleast one filehandle version exists.\n\nReject fh_count == 0 before the allocation, matching the existing zero\nversion_count validation in the flexfiles GETDEVICEINFO parser.\n\nA QEMU/KASAN run with a malformed flexfiles layout hit:\n\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:ff_layout_encode_ff_layoutupdate.isra.0+0x15f/0x750\n ff_layout_encode_layoutreturn+0x683/0x970\n nfs4_xdr_enc_layoutreturn+0x278/0x3a0\n Kernel panic - not syncing: Fatal exception\n\nThe patched kernel rejects the malformed layout without KASAN/oops/panic,\nand a valid fh_count=1 regression still opens, reads, and unmounts cleanly."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in the NFSv4 pNFS flexfiles client parsing a malicious LAYOUTGET layout blob from the server over NFS/RPC; a remote attacker who controls or MITMs the NFS server delivers the crafted fh_count=0 response over the network.\nAC:L - Once a client is using flexfiles pNFS, the attacker fully controls the layout XDR and can set fh_count=0 to deterministically store ZERO_SIZE_PTR; a later I/O, layoutstats, or LAYOUTRETURN path dereferences fh_versions[0] and panics without races or special heap layout.\nPR:N - Exploitation requires no privileges on the victim host; the attacker only needs to be the (or impersonate) the NFS server sending protocol responses after normal client connection/authentication.\nUI:N - After an NFS pNFS flexfiles mount is established (common in enterprise/HPC NAS deployments), triggering the malformed layout and subsequent kernel panic requires no further victim action beyond routine file access on the already-mounted share.\nS:U - Impact is a kernel oops/panic on the NFS client host; it does not cross a VM, container, or IOMMU security boundary to affect a different authority.\nC:N - The failure mode is a NULL-pointer dereference at ZERO_SIZE_PTR (0x10) when accessing fh_versions[0]; KASAN confirms a faulting dereference with no successful out-of-bounds read or information leak to userspace.\nI:N - There is no memory corruption or successful write primitive\u2014only an invalid-pointer dereference that crashes the kernel before any integrity-changing operation completes.\nA:H - A confirmed KASAN null-ptr-deref in ff_layout_encode_ff_layoutupdate during LAYOUTRETURN encoding causes a fatal kernel exception/panic, fully denying availability of the client system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs/flexfilelayout/flexfilelayout.c"], "versions": [{"version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "9033591535c066726f5b505126ccb4068b98fa4f", "status": "affected", "versionType": "git"}, {"version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "18cc6d57a14fa65ab2a2b52279f549041c4bc9cf", "status": "affected", "versionType": "git"}, {"version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "be7829715e341b42846437dd9e721005db59f0cc", "status": "affected", "versionType": "git"}, {"version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "eeabb9020721db6bc132e68eeae380b8d4fb4b04", "status": "affected", "versionType": "git"}, {"version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "7779c85028a0676fb190cde4f0c540f4f8e97761", "status": "affected", "versionType": "git"}, {"version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "d8c90c7cc061265d5f2813a1f5c82ef2f4707e67", "status": "affected", "versionType": "git"}, {"version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "2131ed64b767ffa8bcdb3677d90f3964e39aabc8", "status": "affected", "versionType": "git"}, {"version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs/flexfilelayout/flexfilelayout.c"], "versions": [{"version": "4.0", "status": "affected"}, {"version": "0", "lessThan": "4.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.38", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.3", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.18.38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "7.1.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9033591535c066726f5b505126ccb4068b98fa4f"}, {"url": "https://git.kernel.org/stable/c/18cc6d57a14fa65ab2a2b52279f549041c4bc9cf"}, {"url": "https://git.kernel.org/stable/c/be7829715e341b42846437dd9e721005db59f0cc"}, {"url": "https://git.kernel.org/stable/c/eeabb9020721db6bc132e68eeae380b8d4fb4b04"}, {"url": "https://git.kernel.org/stable/c/7779c85028a0676fb190cde4f0c540f4f8e97761"}, {"url": "https://git.kernel.org/stable/c/d8c90c7cc061265d5f2813a1f5c82ef2f4707e67"}, {"url": "https://git.kernel.org/stable/c/2131ed64b767ffa8bcdb3677d90f3964e39aabc8"}, {"url": "https://git.kernel.org/stable/c/2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2"}], "title": "NFSv4/flexfiles: reject zero filehandle version count", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53392", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:30:14.556570Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:07:46.094Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53392", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:30:14.556570Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:30:15.701Z"}}], "cna": {"title": "NFSv4/flexfiles: reject zero filehandle version count", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is in the NFSv4 pNFS flexfiles client parsing a malicious LAYOUTGET layout blob from the server over NFS/RPC; a remote attacker who controls or MITMs the NFS server delivers the crafted fh_count=0 response over the network.\nAC:L - Once a client is using flexfiles pNFS, the attacker fully controls the layout XDR and can set fh_count=0 to deterministically store ZERO_SIZE_PTR; a later I/O, layoutstats, or LAYOUTRETURN path dereferences fh_versions[0] and panics without races or special heap layout.\nPR:N - Exploitation requires no privileges on the victim host; the attacker only needs to be the (or impersonate) the NFS server sending protocol responses after normal client connection/authentication.\nUI:N - After an NFS pNFS flexfiles mount is established (common in enterprise/HPC NAS deployments), triggering the malformed layout and subsequent kernel panic requires no further victim action beyond routine file access on the already-mounted share.\nS:U - Impact is a kernel oops/panic on the NFS client host; it does not cross a VM, container, or IOMMU security boundary to affect a different authority.\nC:N - The failure mode is a NULL-pointer dereference at ZERO_SIZE_PTR (0x10) when accessing fh_versions[0]; KASAN confirms a faulting dereference with no successful out-of-bounds read or information leak to userspace.\nI:N - There is no memory corruption or successful write primitive\u2014only an invalid-pointer dereference that crashes the kernel before any integrity-changing operation completes.\nA:H - A confirmed KASAN null-ptr-deref in ff_layout_encode_ff_layoutupdate during LAYOUTRETURN encoding causes a fatal kernel exception/panic, fully denying availability of the client system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "9033591535c066726f5b505126ccb4068b98fa4f", "versionType": "git"}, {"status": "affected", "version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "18cc6d57a14fa65ab2a2b52279f549041c4bc9cf", "versionType": "git"}, {"status": "affected", "version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "be7829715e341b42846437dd9e721005db59f0cc", "versionType": "git"}, {"status": "affected", "version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "eeabb9020721db6bc132e68eeae380b8d4fb4b04", "versionType": "git"}, {"status": "affected", "version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "7779c85028a0676fb190cde4f0c540f4f8e97761", "versionType": "git"}, {"status": "affected", "version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "d8c90c7cc061265d5f2813a1f5c82ef2f4707e67", "versionType": "git"}, {"status": "affected", "version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "2131ed64b767ffa8bcdb3677d90f3964e39aabc8", "versionType": "git"}, {"status": "affected", "version": "d67ae825a59d639e4d8b82413af84d854617a87e", "lessThan": "2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2", "versionType": "git"}], "programFiles": ["fs/nfs/flexfilelayout/flexfilelayout.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.0"}, {"status": "unaffected", "version": "0", "lessThan": "4.0", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.96", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.38", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.3", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/nfs/flexfilelayout/flexfilelayout.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9033591535c066726f5b505126ccb4068b98fa4f"}, {"url": "https://git.kernel.org/stable/c/18cc6d57a14fa65ab2a2b52279f549041c4bc9cf"}, {"url": "https://git.kernel.org/stable/c/be7829715e341b42846437dd9e721005db59f0cc"}, {"url": "https://git.kernel.org/stable/c/eeabb9020721db6bc132e68eeae380b8d4fb4b04"}, {"url": "https://git.kernel.org/stable/c/7779c85028a0676fb190cde4f0c540f4f8e97761"}, {"url": "https://git.kernel.org/stable/c/d8c90c7cc061265d5f2813a1f5c82ef2f4707e67"}, {"url": "https://git.kernel.org/stable/c/2131ed64b767ffa8bcdb3677d90f3964e39aabc8"}, {"url": "https://git.kernel.org/stable/c/2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4/flexfiles: reject zero filehandle version count\n\nff_layout_alloc_lseg() decodes the filehandle-version array count\nfrom the flexfiles layout body. The value is used as the count for\nkzalloc_objs(), and the current code only rejects NULL.\n\nA zero count yields ZERO_SIZE_PTR, which can be stored in\ndss_info->fh_versions even though later flexfiles paths assume that at\nleast one filehandle version exists.\n\nReject fh_count == 0 before the allocation, matching the existing zero\nversion_count validation in the flexfiles GETDEVICEINFO parser.\n\nA QEMU/KASAN run with a malformed flexfiles layout hit:\n\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:ff_layout_encode_ff_layoutupdate.isra.0+0x15f/0x750\n ff_layout_encode_layoutreturn+0x683/0x970\n nfs4_xdr_enc_layoutreturn+0x278/0x3a0\n Kernel panic - not syncing: Fatal exception\n\nThe patched kernel rejects the malformed layout without KASAN/oops/panic,\nand a valid fh_count=1 regression still opens, reads, and unmounts cleanly."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.96", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.38", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.3", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:50:43.747Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53392", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:07:46.094Z", "dateReserved": "2026-06-09T07:44:35.402Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T12:01:56.101Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The value is used as the count for\nkzalloc_objs(), and the current code only rejects NULL.\n\nA zero count yields ZERO_SIZE_PTR, which can be stored in\ndss_info->fh_versions even though later flexfiles paths assume that at\nleast one filehandle version exists.\n\nReject fh_count == 0 before the allocation, matching the existing zero\nversion_count validation in the flexfiles GETDEVICEINFO parser.\n\nA QEMU/KASAN run with a malformed flexfiles layout hit:\n\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:ff_layout_encode_ff_layoutupdate.isra.0+0x15f/0x750\n ff_layout_encode_layoutreturn+0x683/0x970\n nfs4_xdr_enc_layoutreturn+0x278/0x3a0\n Kernel panic - not syncing: Fatal exception\n\nThe patched kernel rejects the malformed layout without KASAN/oops/panic,\nand a valid fh_count=1 regression still opens, reads, and unmounts cleanly."}], "id": "CVE-2026-53392", "lastModified": "2026-10-19T20:19:17.987", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53392", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:30:14.556570Z", "version": "2.0.3"}}]}, "published": "2026-07-19T12:16:50.260", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18cc6d57a14fa65ab2a2b52279f549041c4bc9cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2131ed64b767ffa8bcdb3677d90f3964e39aabc8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7779c85028a0676fb190cde4f0c540f4f8e97761"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9033591535c066726f5b505126ccb4068b98fa4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/be7829715e341b42846437dd9e721005db59f0cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d8c90c7cc061265d5f2813a1f5c82ef2f4707e67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eeabb9020721db6bc132e68eeae380b8d4fb4b04"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-20"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: NFSv4/flexfiles: reject zero filehandle version count", "id": "2502240", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502240"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nNFSv4/flexfiles: reject zero filehandle version count\nff_layout_alloc_lseg() decodes the filehandle-version array count\nfrom the flexfiles layout body. The value is used as the count for\nkzalloc_objs(), and the current code only rejects NULL.\nA zero count yields ZERO_SIZE_PTR, which can be stored in\ndss_info->fh_versions even though later flexfiles paths assume that at\nleast one filehandle version exists.\nReject fh_count == 0 before the allocation, matching the existing zero\nversion_count validation in the flexfiles GETDEVICEINFO parser.\nA QEMU/KASAN run with a malformed flexfiles layout hit:\nKASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\nRIP: 0010:ff_layout_encode_ff_layoutupdate.isra.0+0x15f/0x750\nff_layout_encode_layoutreturn+0x683/0x970\nnfs4_xdr_enc_layoutreturn+0x278/0x3a0\nKernel panic - not syncing: Fatal exception\nThe patched kernel rejects the malformed layout without KASAN/oops/panic,\nand a valid fh_count=1 regression still opens, reads, and unmounts cleanly.", "A flaw was found in the Linux kernel's NFSv4 (Network File System version 4) flexfiles component. This vulnerability occurs when the ff_layout_alloc_lseg() function processes a malformed flexfiles layout that specifies a zero filehandle version count. An attacker could exploit this by providing a specially crafted flexfiles layout, leading to a null-pointer dereference and ultimately causing a kernel panic, resulting in a Denial of Service (DoS) for the system."], "name": "CVE-2026-53392", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53392\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53392\nhttps://lore.kernel.org/linux-cve-announce/2026071956-CVE-2026-53392-540c@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d67ae825a59d639e4d8b82413af84d854617a87e,7779c85028a0676fb190cde4f0c540f4f8e97761)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d67ae825a59d639e4d8b82413af84d854617a87e,d8c90c7cc061265d5f2813a1f5c82ef2f4707e67)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d67ae825a59d639e4d8b82413af84d854617a87e,2131ed64b767ffa8bcdb3677d90f3964e39aabc8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d67ae825a59d639e4d8b82413af84d854617a87e,2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.38,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.3,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T02:15:04.203375+00:00", "updated": "2026-10-20T14:15:14.441819+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}