172 lines
8.9 KiB
JSON
172 lines
8.9 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2024-46696",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2024-09-11T15:12:18.250Z",
|
|
"datePublished": "2024-09-13T05:29:24.123Z",
|
|
"dateUpdated": "2026-08-05T11:38:01.015Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T11:38:01.015Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix potential UAF in nfsd4_cb_getattr_release\n\nOnce we drop the delegation reference, the fields embedded in it are no\nlonger safe to access. Do that last."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
|
|
"baseScore": 9.8,
|
|
"baseSeverity": "CRITICAL"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:N - The vulnerable path is in the in-kernel NFS server and is driven entirely by NFSv4 COMPOUND requests (OPEN/GETATTR/DELEGRETURN) and the client's CB_GETATTR callback reply over TCP port 2049. No local access to the server is needed.\nAC:L - The attacker controls both sides of the race — the CB_GETATTR reply timing on its own callback channel (the server's wait is a fixed 30 ms timeout that is trivially exceeded on purpose) and the DELEGRETURN that drops the delegation's in-force reference — so it can deterministically arrange for the release callback's put to be the final one.\nPR:N - NFS AUTH_SYS performs no real authentication: any host permitted by the export list simply asserts a uid, and CVSS does not treat network-level export ACLs as privileges. On a typical rw NFSv4 export the attacker needs only to open a file for write and issue a GETATTR from a second clientid, both pre-any-credential-verification.\nUI:N - The attacker drives both the delegation-holding client and the GETATTR-issuing client itself; no action by any legitimate user or administrator is required.\nS:U - The use-after-free corrupts kernel slab memory within the same security authority as the nfsd server; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A use-after-free on a freed nfs4_delegation gives the attacker, who can groom the reallocation, read access to the reused object — the wake path's test_bit() reads the freed word, and a delegation reused with stale/attacker-adjacent state can leak kernel pointers and file attribute data back over the NFS connection.\nI:H - clear_bit() performs a write into freed slab memory at a fixed offset; since deleg_slab is created with no SLAB_ACCOUNT and no constructor it merges with other same-size caches, turning this into a groomable arbitrary-object bit-clear primitive usable to corrupt flags, counters, or pointer low bits for control-flow hijacking.\nA:H - The use-after-free reliably corrupts freed or reallocated delegation state, causing KASAN-detected UAF, spurious CB_GETATTR re-issue on an in-flight callback, and kernel oops/panic of the NFS file server, which can be triggered repeatedly."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"fs/nfsd/nfs4state.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "c5967721e1063648b0506481585ba7e2e49a075e",
|
|
"lessThan": "e0b66698a5ae41078f7490e8b3527013f5fccd6c",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "c5967721e1063648b0506481585ba7e2e49a075e",
|
|
"lessThan": "1116e0e372eb16dd907ec571ce5d4af325c55c10",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"fs/nfsd/nfs4state.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "6.9",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "6.9",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.10.8",
|
|
"lessThanOrEqual": "6.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.11",
|
|
"lessThanOrEqual": "*",
|
|
"status": "unaffected",
|
|
"versionType": "original_commit_for_fix"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"cpeApplicability": [
|
|
{
|
|
"nodes": [
|
|
{
|
|
"operator": "OR",
|
|
"negate": false,
|
|
"cpeMatch": [
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.9",
|
|
"versionEndExcluding": "6.10.8"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.9",
|
|
"versionEndExcluding": "6.11"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/e0b66698a5ae41078f7490e8b3527013f5fccd6c"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/1116e0e372eb16dd907ec571ce5d4af325c55c10"
|
|
}
|
|
],
|
|
"title": "nfsd: fix potential UAF in nfsd4_cb_getattr_release",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"timestamp": "2024-09-29T15:05:32.048367Z",
|
|
"id": "CVE-2024-46696",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"role": "CISA Coordinator",
|
|
"version": "2.0.3"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2024-09-29T15:05:46.361Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |