362 lines
18 KiB
JSON
362 lines
18 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-2021-47259",
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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": "2024-05-21T13:27:52.125Z",
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"datePublished": "2024-05-21T14:19:52.738Z",
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"dateUpdated": "2026-08-05T08:47:00.677Z"
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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": "2026-08-05T08:47:00.677Z"
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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: Fix use-after-free in nfs4_init_client()\n\nKASAN reports a use-after-free when attempting to mount two different\nexports through two different NICs that belong to the same server.\n\nOlga was able to hit this with kernels starting somewhere between 5.7\nand 5.10, but I traced the patch that introduced the clear_bit() call to\n4.13. So something must have changed in the refcounting of the clp\npointer to make this call to nfs_put_client() the very last one."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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 - This is NFS client code in fs/nfs/nfs4client.c (nfs4_init_client), reached via local mount or NFSv4 referral/submount automount (nfs_d_automount → nfs4_create_referral_server → nfs4_set_client → nfs_get_client), not via nfsd/ksmbd or unsolicited packet processing.\nAC:L - An attacker who can mount two exports via different NICs of the same server, or drive referral/migration to a trunking-matched address (including a cooperating/malicious NFS server), fully controls the trunking-discovery path that yields clp != old and frees clp before clear_bit; no race or layout outside attacker influence is required.\nPR:L - Although a fresh NFS mount needs CAP_SYS_ADMIN (nfs_fs_type lacks FS_USERNS_MOUNT), an unprivileged user can reach nfs4_init_client via NFSv4 referral/submount automounts or migration on an already-mounted export, matching prior CNA scoring of this same init path.\nUI:N - Once an NFS share is present, the attacker triggers the bug themselves by mounting/walking a referral or exercising migration; no separate victim action is required beyond that environmental mount.\nS:U - The use-after-free corrupts host kernel heap state within the same OS security authority and does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - nfs_put_client can kfree the nfs_client while clear_bit still writes clp->cl_flags, a classic slab UAF; reclaim of the freed object enables arbitrary kernel memory disclosure under standard UAF exploitation.\nI:H - The post-free clear_bit is a write into freed nfs_client memory, and heap spraying the reclaimed object yields arbitrary-write and control-flow hijacking primitives consistent with scoring other kernel UAFs as High integrity.\nA:H - Use-after-free of struct nfs_client causes kernel oops/panic when the freed object is touched (KASAN reported this path), so availability impact is High even without a full exploit."
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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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"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/nfs4client.c"
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],
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"version": "8dcbec6d20eb881ba368d0aebc3a8a678aebb1da",
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"defaultStatus": "affected",
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"programFiles": [
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"fs/nfs/nfs4client.c"
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],
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"versions": [
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{
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"version": "4.13",
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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": "4.13",
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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": "4.14.237",
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"lessThanOrEqual": "4.14.*",
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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": "4.19.195",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.126",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.44",
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"lessThanOrEqual": "5.10.*",
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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": "5.12.11",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"title": "NFS: Fix use-after-free in nfs4_init_client()",
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