189 lines
9.2 KiB
JSON
189 lines
9.2 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-72132",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-09T03:40:39.907Z",
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"datePublished": "2026-08-15T05:53:08.096Z",
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"dateUpdated": "2026-08-17T05:08:49.516Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T05:08:49.516Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/nfs/internal.h",
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"fs/nfs/pnfs_nfs.c",
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"fs/nfs/write.c"
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],
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"versions": [
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{
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"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813",
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"lessThan": "a442c258320b689f13d2205eaeeddf8b0e630288",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813",
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"lessThan": "1f646e23372f3444dc5f0bcb5404a49d26756add",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813",
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"lessThan": "0ffc032294a29601b1019dba91aa1a930d90df17",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813",
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"lessThan": "a192b6c149c6ea10cc88869accb78165eb454456",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813",
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"lessThan": "27934d02cbeb8a957dd11c985a579e58d30c5270",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/nfs/internal.h",
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"fs/nfs/pnfs_nfs.c",
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"fs/nfs/write.c"
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],
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"versions": [
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{
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"version": "6.3",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.148",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.97",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.40",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.3",
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"versionEndExcluding": "6.6.148"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.3",
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"versionEndExcluding": "6.12.97"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.3",
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"versionEndExcluding": "6.18.40"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.3",
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"versionEndExcluding": "7.1.5"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.3",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a442c258320b689f13d2205eaeeddf8b0e630288"
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},
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{
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"url": "https://git.kernel.org/stable/c/1f646e23372f3444dc5f0bcb5404a49d26756add"
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},
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{
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"url": "https://git.kernel.org/stable/c/0ffc032294a29601b1019dba91aa1a930d90df17"
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},
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{
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"url": "https://git.kernel.org/stable/c/a192b6c149c6ea10cc88869accb78165eb454456"
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},
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{
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"url": "https://git.kernel.org/stable/c/27934d02cbeb8a957dd11c985a579e58d30c5270"
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}
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],
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"title": "NFS: Charge unstable writes by request size, not folio size",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |