180 lines
9.4 KiB
JSON
180 lines
9.4 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-2026-72364",
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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": "2026-08-09T03:40:39.921Z",
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"datePublished": "2026-08-15T05:56:02.722Z",
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"dateUpdated": "2026-08-17T05:43:18.766Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T05:43:18.766Z"
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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\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."
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}
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],
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"metrics": [
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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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": "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/netfs/write_issue.c"
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],
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"status": "affected",
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"fs/netfs/write_issue.c"
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],
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{
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"version": "6.10",
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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": "6.10",
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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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},
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/fb39ffd3cc5422887fd118668ff45ebfdbc83302"
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},
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{
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"url": "https://git.kernel.org/stable/c/1bb33d959aabcde07d724b5eb9992462e91fa79a"
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{
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"url": "https://git.kernel.org/stable/c/89df9c158a25d0a7c6ca079a9bd9ca7009d75c7b"
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},
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{
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"url": "https://git.kernel.org/stable/c/ac5f95ac5d6d0f4c567b8b642825705a2bf0d79e"
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}
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],
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"title": "netfs: Fix writeback error handling",
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