{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72364", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.921Z", "datePublished": "2026-08-15T05:56:02.722Z", "dateUpdated": "2026-08-17T05:43:18.766Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:18.766Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix writeback error handling\n\nFix the error handling in writeback_iter() loop. If an error occurs,\nwriteback_iter() needs to be called again with *error set to the error so\nthat it can clean up iteration state. Further, the current folio needs\nunlocking and redirtying."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is in client-side netfs writeback reached only via local VFS writeback (do_writepages -> netfs_writepages) on CIFS, 9p, and AFS mounts after local writes/mmaps dirty pagecache; it is not in ksmbd/nfsd or other packet-receive paths.\nAC:L - An attacker can reliably trigger -ENOMEM during writeback by exhausting the 100-entry folio_queue mempool or system memory while dirtying many pages on a netfs mount, then forcing writeback via sync/fsync, close, or reclaim.\nPR:L - Exploitation requires a local process with write access to files on a netfs-backed mount (typical unprivileged CIFS/9p/AFS user); no real-root or init-namespace-only capability is needed beyond normal filesystem permissions.\nUI:N - No victim interaction is required beyond normal background writeback or attacker-initiated sync/memory pressure; exploitation does not depend on a victim opening a file or mounting a share at attack time.\nS:U - Impact is confined to the kernel pagecache and netfs writeback state on the affected host; it does not cross VM, container, or IOMMU security boundaries into another authority.\nC:N - The flaw mishandles folio locks and dirty state causing data loss or hangs; it does not expose kernel memory, leak pointers, or provide an out-of-bounds or use-after-free read primitive.\nI:H - On -ENOMEM at writeback start the vulnerable path calls netfs_kill_dirty_pages(), which clears dirty folios without uploading them, silently destroying arbitrary unsaved buffered data on network filesystem mounts.\nA:H - Breaking out of the writeback_iter loop on error leaves folios locked and writeback state uncleared, causing indefinite blocking of processes accessing those pages and stalling future writeback on affected files."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/netfs/write_issue.c"], "versions": [{"version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "lessThan": "fb39ffd3cc5422887fd118668ff45ebfdbc83302", "status": "affected", "versionType": "git"}, {"version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "lessThan": "1bb33d959aabcde07d724b5eb9992462e91fa79a", "status": "affected", "versionType": "git"}, {"version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "lessThan": "89df9c158a25d0a7c6ca079a9bd9ca7009d75c7b", "status": "affected", "versionType": "git"}, {"version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "lessThan": "ac5f95ac5d6d0f4c567b8b642825705a2bf0d79e", "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/netfs/write_issue.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "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": "6.10", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/fb39ffd3cc5422887fd118668ff45ebfdbc83302"}, {"url": "https://git.kernel.org/stable/c/1bb33d959aabcde07d724b5eb9992462e91fa79a"}, {"url": "https://git.kernel.org/stable/c/89df9c158a25d0a7c6ca079a9bd9ca7009d75c7b"}, {"url": "https://git.kernel.org/stable/c/ac5f95ac5d6d0f4c567b8b642825705a2bf0d79e"}], "title": "netfs: Fix writeback error handling", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/netfs/write_issue.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "fb39ffd3cc5422887fd118668ff45ebfdbc83302", "status": "affected", "version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "versionType": "git"}, {"lessThan": "1bb33d959aabcde07d724b5eb9992462e91fa79a", "status": "affected", "version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "versionType": "git"}, {"lessThan": "89df9c158a25d0a7c6ca079a9bd9ca7009d75c7b", "status": "affected", "version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "versionType": "git"}, {"lessThan": "ac5f95ac5d6d0f4c567b8b642825705a2bf0d79e", "status": "affected", "version": "288ace2f57c9d06dd2e42bd80d03747d879a4068", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/netfs/write_issue.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix writeback error handling\n\nFix the error handling in writeback_iter() loop. If an error occurs,\nwriteback_iter() needs to be called again with *error set to the error so\nthat it can clean up iteration state. Further, the current folio needs\nunlocking and redirtying."}], "id": "CVE-2026-72364", "lastModified": "2026-08-17T06:18:40.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:09.823", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1bb33d959aabcde07d724b5eb9992462e91fa79a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/89df9c158a25d0a7c6ca079a9bd9ca7009d75c7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ac5f95ac5d6d0f4c567b8b642825705a2bf0d79e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fb39ffd3cc5422887fd118668ff45ebfdbc83302"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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