CVE-2026-72132

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72132", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.907Z", "datePublished": "2026-08-15T05:53:08.096Z", "dateUpdated": "2026-08-17T05:08:49.516Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:08:49.516Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Charge unstable writes by request size, not folio size\n\nnfs_folio_mark_unstable() and nfs_folio_clear_commit() charge and\nuncharge NR_WRITEBACK/WB_WRITEBACK by folio_nr_pages(folio) once per\n*request* added to or removed from a commit list. This is correct only\nwhen a folio has a single associated request. When pg_test splits a\nfolio into N sub-folio requests (e.g. pNFS flexfiles striping with a\nstripe unit smaller than the folio size, or plain wsize-limited\nsplitting), each of the N requests independently charges the whole\nfolio's page count, inflating the accounting by a factor of N per\nfolio. With large folios and small stripe units this reaches multiple\norders of magnitude: a 2 MiB folio split into 512 4 KiB requests can\ncharge up to 512x its real size, pushing global dirty+writeback\naccounting past the system's dirty threshold and forcing every\nbuffered writer on the host into the hard-throttle path, including\nunrelated in-kernel NFS server threads sharing the box.\n\nCharge each request only for the pages it actually covers."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfs/internal.h", "fs/nfs/pnfs_nfs.c", "fs/nfs/write.c"], "versions": [{"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "lessThan": "a442c258320b689f13d2205eaeeddf8b0e630288", "status": "affected", "versionType": "git"}, {"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "lessThan": "1f646e23372f3444dc5f0bcb5404a49d26756add", "status": "affected", "versionType": "git"}, {"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "lessThan": "0ffc032294a29601b1019dba91aa1a930d90df17", "status": "affected", "versionType": "git"}, {"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "lessThan": "a192b6c149c6ea10cc88869accb78165eb454456", "status": "affected", "versionType": "git"}, {"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "lessThan": "27934d02cbeb8a957dd11c985a579e58d30c5270", "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/internal.h", "fs/nfs/pnfs_nfs.c", "fs/nfs/write.c"], "versions": [{"version": "6.3", "status": "affected"}, {"version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "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": "6.3", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a442c258320b689f13d2205eaeeddf8b0e630288"}, {"url": "https://git.kernel.org/stable/c/1f646e23372f3444dc5f0bcb5404a49d26756add"}, {"url": "https://git.kernel.org/stable/c/0ffc032294a29601b1019dba91aa1a930d90df17"}, {"url": "https://git.kernel.org/stable/c/a192b6c149c6ea10cc88869accb78165eb454456"}, {"url": "https://git.kernel.org/stable/c/27934d02cbeb8a957dd11c985a579e58d30c5270"}], "title": "NFS: Charge unstable writes by request size, not folio size", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfs/internal.h", "fs/nfs/pnfs_nfs.c", "fs/nfs/write.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a442c258320b689f13d2205eaeeddf8b0e630288", "status": "affected", "version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "versionType": "git"}, {"lessThan": "1f646e23372f3444dc5f0bcb5404a49d26756add", "status": "affected", "version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "versionType": "git"}, {"lessThan": "0ffc032294a29601b1019dba91aa1a930d90df17", "status": "affected", "version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "versionType": "git"}, {"lessThan": "a192b6c149c6ea10cc88869accb78165eb454456", "status": "affected", "version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "versionType": "git"}, {"lessThan": "27934d02cbeb8a957dd11c985a579e58d30c5270", "status": "affected", "version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfs/internal.h", "fs/nfs/pnfs_nfs.c", "fs/nfs/write.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.3"}, {"lessThan": "6.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "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\nNFS: Charge unstable writes by request size, not folio size\n\nnfs_folio_mark_unstable() and nfs_folio_clear_commit() charge and\nuncharge NR_WRITEBACK/WB_WRITEBACK by folio_nr_pages(folio) once per\n*request* added to or removed from a commit list. This is correct only\nwhen a folio has a single associated request. When pg_test splits a\nfolio into N sub-folio requests (e.g. pNFS flexfiles striping with a\nstripe unit smaller than the folio size, or plain wsize-limited\nsplitting), each of the N requests independently charges the whole\nfolio's page count, inflating the accounting by a factor of N per\nfolio. With large folios and small stripe units this reaches multiple\norders of magnitude: a 2 MiB folio split into 512 4 KiB requests can\ncharge up to 512x its real size, pushing global dirty+writeback\naccounting past the system's dirty threshold and forcing every\nbuffered writer on the host into the hard-throttle path, including\nunrelated in-kernel NFS server threads sharing the box.\n\nCharge each request only for the pages it actually covers."}], "id": "CVE-2026-72132", "lastModified": "2026-08-17T06:18:12.897", "metrics": {}, "published": "2026-08-15T06:21:30.657", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0ffc032294a29601b1019dba91aa1a930d90df17"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f646e23372f3444dc5f0bcb5404a49d26756add"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/27934d02cbeb8a957dd11c985a579e58d30c5270"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a192b6c149c6ea10cc88869accb78165eb454456"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a442c258320b689f13d2205eaeeddf8b0e630288"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: NFS: Charge unstable writes by request size, not folio size", "id": "2516576", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516576"}, "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-911", "details": ["A flaw was found in the Linux kernel's Network File System (NFS) component. The `nfs_folio_mark_unstable()` and `nfs_folio_clear_commit()` functions incorrectly account for unstable writes, charging the full folio size for each sub-folio request. This inflated accounting can push the system's dirty page threshold, leading to a system-wide throttling of all buffered writers, including unrelated in-kernel NFS server threads. This can result in a denial of service for affected systems."], "name": "CVE-2026-72132", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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-2026-72132\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72132\nhttps://lore.kernel.org/linux-cve-announce/2026081530-CVE-2026-72132-7efe@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c493b5cf16e28d761b6e77c7c32aa0e7af70813,a442c258320b689f13d2205eaeeddf8b0e630288)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c493b5cf16e28d761b6e77c7c32aa0e7af70813,1f646e23372f3444dc5f0bcb5404a49d26756add)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c493b5cf16e28d761b6e77c7c32aa0e7af70813,0ffc032294a29601b1019dba91aa1a930d90df17)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c493b5cf16e28d761b6e77c7c32aa0e7af70813,a192b6c149c6ea10cc88869accb78165eb454456)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c493b5cf16e28d761b6e77c7c32aa0e7af70813,27934d02cbeb8a957dd11c985a579e58d30c5270)"}}], "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": "6.3"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc3,*]"}}], "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": "2026-08-15T09:00:06.791668+00:00", "updated": "2026-08-18T20:30:17.193467+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}