159 lines
9.1 KiB
JSON
159 lines
9.1 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-2025-21988",
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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": "2024-12-29T08:45:45.800Z",
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"datePublished": "2025-04-02T12:53:12.170Z",
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"dateUpdated": "2026-08-05T11:55:52.895Z"
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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": "2026-08-05T11:55:52.895Z"
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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\nfs/netfs/read_collect: add to next->prev_donated\n\nIf multiple subrequests donate data to the same \"next\" request\n(depending on the subrequest completion order), each of them would\noverwrite the `prev_donated` field, causing data corruption and a\nBUG() crash (\"Can't donate prior to front\")."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - The vulnerable donation accounting in fs/netfs is driven entirely by data returned from a remote peer — subrequest completion order, short-read lengths and non-folio-aligned boundaries are chosen by the SMB/9p/Ceph/AFS server, and `netfs_read_subreq_terminated()` is invoked directly from those filesystems' network receive paths. A malicious or compromised file server, or an on-path attacker against an unsigned/unencrypted cifs, 9p or NFS mount, reaches the bug over the network.\nAC:L - The remote server controls both sides of the race: it decides when each READ response is sent and how much data it carries, so it can deterministically make two subrequests donate to the same successor and clobber `prev_donated`. The bug was reported from ordinary production use rather than a targeted fuzz, and the affected filesystems are enabled in all mainstream kernel configs.\nPR:N - The attacker is the remote server (or an on-path attacker) and needs no credentials or account on the victim host — only that the victim have a netfs-backed mount it reads from. No local privilege on the target is involved.\nUI:N - Ordinary background readahead on an already-mounted share (fstab/automount, container volume, WSL/Kata 9p, backup or indexer scans) is enough to drive the read-collection path; no specific victim action is required.\nS:U - The corruption and crash are confined to the kernel's own page cache and netfs request state; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Lost donations make `netfs_unlock_read_folio()` mark folios uptodate for ranges no subrequest ever filled and inflate `rreq->transferred`, so read() returns uninitialized page-cache pages — arbitrary previously-freed kernel memory — to userspace, and the collector can also walk off the folio queue into invalid `folioq` pointers.\nI:H - The commit states the bug causes data corruption; because `NETFS_READ_FOR_WRITE` is one of the affected origins, a folio wrongly marked uptodate with unfilled content is subsequently written back, persisting corrupted data to the file on the server, and the broken start/len/transferred bookkeeping corrupts page-cache state generally.\nA:H - The mis-accounting hits an explicit `BUG()` (\"Can't donate prior to front\"/\"fpos > start\") in the filesystem completion context, killing the worker or softirq while rolling-buffer folios remain locked — a kernel panic, or at minimum an unrecoverable hang of every task waiting on those folios and of the mount."
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}
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]
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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/netfs/read_collect.c"
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],
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"versions": [
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{
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"version": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
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"lessThan": "62b9ad7e52d4777f7e775ee1f0ad2452f6041024",
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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": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
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"lessThan": "e25cec3b76aba47a49138d2162fc809c6cd49c9e",
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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": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
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"lessThan": "e2d46f2ec332533816417b60933954173f602121",
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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/netfs/read_collect.c"
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],
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"versions": [
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{
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"version": "6.12",
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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": "6.12",
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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": "6.12.20",
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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": "6.13.8",
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"lessThanOrEqual": "6.13.*",
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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": "6.14",
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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": "6.12",
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"versionEndExcluding": "6.12.20"
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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": "6.12",
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"versionEndExcluding": "6.13.8"
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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": "6.12",
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"versionEndExcluding": "6.14"
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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/62b9ad7e52d4777f7e775ee1f0ad2452f6041024"
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},
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{
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"url": "https://git.kernel.org/stable/c/e25cec3b76aba47a49138d2162fc809c6cd49c9e"
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},
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{
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"url": "https://git.kernel.org/stable/c/e2d46f2ec332533816417b60933954173f602121"
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}
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],
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"title": "fs/netfs/read_collect: add to next->prev_donated",
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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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} |