CVE-2026-72438

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Several failure\npaths in raid10_handle_discard() complete the bio and return without\nreleasing the corresponding reference, causing md_write_end() to be\nskipped.\n\nCall md_write_end() before returning from these failure paths to keep\nwrites_pending accounting balanced.\n\nAdditionally, discard split allocation failures can occur after\nwait_barrier() succeeds. Those paths return without calling\nallow_barrier(), leaking the associated barrier reference.\n\nRelease the barrier before returning from those paths."}], "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 - RAID10 is commonly used on network-facing storage servers; discard/TRIM/UNMAP from remote iSCSI initiators or NFS clients reaches raid10_make_request() through the block layer without local host login.\nAC:L - An attacker can reliably trigger the bug by issuing large, stripe-misaligned discards to force bio_split() and inducing GFP_NOIO allocation failure via self-created memory pressure; no rare timing or victim state is required.\nPR:N - Exploitation requires only network reachability to a storage service that accepts discard/UNMAP/DEALLOCATE on the RAID10 LUN or exported filesystem, not Linux host administrator privileges or capabilities.\nUI:N - Discard, TRIM, punch-hole, and SCSI UNMAP are programmatic storage operations that do not require any interactive action by a human victim beyond normal automated I/O.\nS:U - The leaked writes_pending and barrier/nr_pending counters only corrupt RAID10/md internal accounting within the kernel storage stack and do not cross VM, container, or IOMMU security boundaries.\nC:N - The flaw is reference-count leakage on writes_pending and nr_pending with no out-of-bounds access, use-after-free, or memory disclosure; no confidential data is exposed.\nI:N - No memory corruption or unauthorized modification of user or filesystem data occurs; impact is limited to incorrect internal IO/barrier accounting rather than integrity compromise.\nA:H - Leaked nr_pending prevents raise_barrier() and freeze_array() from ever completing, causing indefinite kernel thread hangs during recovery/reshape/error handling and persistent denial of storage service on the array."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/raid10.c"], "versions": [{"version": "c9aa889b035fca4598ae985a0f0c76ebbb547ad2", "lessThan": "2d264c00beadcc67f16d683ab27eed28c047ba2e", "status": "affected", "versionType": "git"}, {"version": "c9aa889b035fca4598ae985a0f0c76ebbb547ad2", "lessThan": "80ac31cce55432034a9eb98262c92ace7866e494", "status": "affected", "versionType": "git"}, {"version": "c9aa889b035fca4598ae985a0f0c76ebbb547ad2", "lessThan": "fea33968592559a55a3f5a96a6386bebcaf988a8", "status": "affected", "versionType": "git"}, {"version": "c9aa889b035fca4598ae985a0f0c76ebbb547ad2", "lessThan": "11b35d1906a7277a3d64afe34224133b44327328", "status": "affected", "versionType": "git"}, {"version": "c9aa889b035fca4598ae985a0f0c76ebbb547ad2", "lessThan": "d1324b41dabd26787559efaeb430643c627c1eb0", "status": "affected", "versionType": "git"}, {"version": "c9aa889b035fca4598ae985a0f0c76ebbb547ad2", "lessThan": "393d687131d8aa8c7e4de2cb494438e145d20fc2", "status": "affected", "versionType": "git"}, {"version": "39db562b3fedb93978a7e42dd216b306740959f8", "status": "affected", "versionType": "git"}, {"version": "5.15.111", "lessThan": "5.16", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/raid10.c"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "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": "5.17", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.111"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2d264c00beadcc67f16d683ab27eed28c047ba2e"}, {"url": "https://git.kernel.org/stable/c/80ac31cce55432034a9eb98262c92ace7866e494"}, {"url": "https://git.kernel.org/stable/c/fea33968592559a55a3f5a96a6386bebcaf988a8"}, {"url": "https://git.kernel.org/stable/c/11b35d1906a7277a3d64afe34224133b44327328"}, {"url": "https://git.kernel.org/stable/c/d1324b41dabd26787559efaeb430643c627c1eb0"}, {"url": "https://git.kernel.org/stable/c/393d687131d8aa8c7e4de2cb494438e145d20fc2"}], "title": "md/raid10: fix writes_pending and barrier reference leaks on discard failures", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72438", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T18:50:00.249923Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:24.215Z"}}]}}

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Several failure\npaths in raid10_handle_discard() complete the bio and return without\nreleasing the corresponding reference, causing md_write_end() to be\nskipped.\n\nCall md_write_end() before returning from these failure paths to keep\nwrites_pending accounting balanced.\n\nAdditionally, discard split allocation failures can occur after\nwait_barrier() succeeds. Those paths return without calling\nallow_barrier(), leaking the associated barrier reference.\n\nRelease the barrier before returning from those paths."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.160", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.111", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.53", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.15.111"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:29:23.144Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72438", "state": "PUBLISHED", "dateUpdated": "2026-10-30T12:29:23.144Z", "dateReserved": "2026-08-09T03:40:39.929Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:56:51.384Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Several failure\npaths in raid10_handle_discard() complete the bio and return without\nreleasing the corresponding reference, causing md_write_end() to be\nskipped.\n\nCall md_write_end() before returning from these failure paths to keep\nwrites_pending accounting balanced.\n\nAdditionally, discard split allocation failures can occur after\nwait_barrier() succeeds. Those paths return without calling\nallow_barrier(), leaking the associated barrier reference.\n\nRelease the barrier before returning from those paths."}], "id": "CVE-2026-72438", "lastModified": "2026-10-30T13:19:52.197", "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-2026-72438", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:50:00.249923Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:17.660", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/11b35d1906a7277a3d64afe34224133b44327328"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2d264c00beadcc67f16d683ab27eed28c047ba2e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/393d687131d8aa8c7e4de2cb494438e145d20fc2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/80ac31cce55432034a9eb98262c92ace7866e494"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d1324b41dabd26787559efaeb430643c627c1eb0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fea33968592559a55a3f5a96a6386bebcaf988a8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: md/raid10: fix writes_pending and barrier reference leaks on discard failures", "id": "2516425", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516425"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["A flaw was found in the Linux kernel's multiple device (MD) driver, specifically in the RAID10 implementation. This vulnerability occurs due to reference leaks in the `writes_pending` and `barrier` mechanisms during discard failures. An attacker could potentially exploit this by triggering discard failures, leading to resource exhaustion and a Denial of Service (DoS) on the affected system."], "name": "CVE-2026-72438", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72438\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72438\nhttps://lore.kernel.org/linux-cve-announce/2026081528-CVE-2026-72438-f2cb@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c9aa889b035fca4598ae985a0f0c76ebbb547ad2,d1324b41dabd26787559efaeb430643c627c1eb0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c9aa889b035fca4598ae985a0f0c76ebbb547ad2,393d687131d8aa8c7e4de2cb494438e145d20fc2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "39db562b3fedb93978a7e42dd216b306740959f8"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.111,5.16)"}}], "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": "semver", "value": "5.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"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": "2026-08-15T12:00:05.302857+00:00", "updated": "2026-08-18T14:30:05.126020+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-675", "CWE-772"]}