186 lines
9.7 KiB
JSON
186 lines
9.7 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-2026-64216",
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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": "2026-07-19T15:36:31.770Z",
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"datePublished": "2026-07-24T15:23:04.673Z",
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"dateUpdated": "2026-08-27T12:39:42.119Z"
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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": "2026-08-27T12:39:42.119Z"
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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 potential UAF in netfs_unlock_abandoned_read_pages()\n\nnetfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it\nis wanting to unlock and compares that to rreq->no_unlock_folio so that it\ndoesn't unlock a folio being read for netfs_perform_write() or\nnetfs_write_begin().\n\nHowever, given that netfs_unlock_abandoned_read_pages() is called _after_\nNETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to\ndereference is the one specified by ->no_unlock_folio as ownership\nimmediately reverts to the caller.\n\nFix this by storing the folio pointer instead and using that rather than\nthe index. Also fix netfs_unlock_read_folio() where the same applies."
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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 read-for-write completion is used by network filesystem clients including Ceph, SMB, 9P, and AFS. A malicious filesystem peer can induce failed or malformed reads and control completion timing.\nAC:L - Partial buffered writes and concurrent invalidation can repeatedly trigger the race, with an adjacent bug reproducing approximately 30% of repeated attempts. The attacker can influence completion, reuse, and retry timing.\nPR:N - A malicious filesystem server requires no privileges on the victim client; mount and session credentials belong to the victim.\nUI:N - Once the network filesystem is mounted, ordinary or automated writes can exercise the vulnerable path without further human action.\nS:U - The UAF corrupts resources within the host kernel's existing security authority and does not inherently cross a VM, IOMMU, or sandbox boundary.\nC:H - The stale folio can be freed and reused, and premature unlocking of a replacement page can expose page-cache or kernel contents.\nI:H - If the folio is reused, folio_unlock() can toggle PG_locked on an unrelated page, enabling concurrent memory corruption and potentially code execution.\nA:H - The condition can trigger a VM_BUG_ON_FOLIO kernel crash; incorrect PG_locked state can also cause permanent page-lock waits and system hangs."
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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/buffered_read.c",
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"fs/netfs/read_collect.c",
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"fs/netfs/read_retry.c",
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"include/linux/netfs.h"
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],
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"versions": [
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{
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"version": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
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"lessThan": "d4ae8dba90b89e7bb4d1045d1cb26afbaf13ee5c",
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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": "6080fa3ecfbb4448a3b47368629534c09b6ec750",
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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": "3866d015f33aeedf81338dd99154703bef33faef",
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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": "dbe556972100fabb8e5a1b3d2163831ff07b1e8e",
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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/buffered_read.c",
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"fs/netfs/read_collect.c",
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"fs/netfs/read_retry.c",
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"include/linux/netfs.h"
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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": "6.12.106",
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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": "6.18.34",
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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": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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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",
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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": "6.12.106"
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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": "6.18.34"
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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": "7.0.11"
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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": "7.1"
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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/d4ae8dba90b89e7bb4d1045d1cb26afbaf13ee5c"
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},
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{
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"url": "https://git.kernel.org/stable/c/6080fa3ecfbb4448a3b47368629534c09b6ec750"
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},
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{
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"url": "https://git.kernel.org/stable/c/3866d015f33aeedf81338dd99154703bef33faef"
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},
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{
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"url": "https://git.kernel.org/stable/c/dbe556972100fabb8e5a1b3d2163831ff07b1e8e"
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}
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],
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"title": "netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()",
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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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} |