172 lines
9.4 KiB
JSON
172 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-2024-46697",
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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": "2024-09-11T15:12:18.250Z",
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"datePublished": "2024-09-13T05:29:24.787Z",
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"dateUpdated": "2026-08-05T11:38:02.067Z"
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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": "2026-08-05T11:38:02.067Z"
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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\nnfsd: ensure that nfsd4_fattr_args.context is zeroed out\n\nIf nfsd4_encode_fattr4 ends up doing a \"goto out\" before we get to\nchecking for the security label, then args.context will be set to\nuninitialized junk on the stack, which we'll then try to free.\nInitialize it early."
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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 code is the NFSv4 attribute encoder in the in-kernel NFS server, reached directly from GETATTR/READDIR/OPEN operations in a client-supplied COMPOUND over TCP port 2049. No local access is needed — an attacker acting as an NFS client on the network drives the entire path.\nAC:L - The attacker controls every input needed: the requested attribute bitmap (FATTR4_WORD0_CHANGE/SIZE/ACL/FILEHANDLE) and the condition that forces the early exit, e.g. holding a write delegation and deliberately stalling the CB_GETATTR callback so nfsd4_deleg_getattr_conflict returns nfserr_jukebox, and the operation can be repeated indefinitely. CONFIG_NFSD_V4_SECURITY_LABEL is enabled by all major distributions, so no rare configuration is required.\nPR:N - Reaching nfsd4_encode_fattr4 needs only a filehandle obtained via PUTROOTFH/LOOKUP or PUTFH on an accessible export; with the ubiquitous sec=sys (AUTH_SYS) flavor there is no cryptographic authentication at all — the client simply asserts a uid, so a remote unauthenticated peer permitted by the export list can issue the triggering GETATTR/READDIR.\nUI:N - The attacker issues the NFSv4 COMPOUND requests and holds the conflicting delegation entirely on its own. No action by any administrator or other user on the server is required.\nS:U - The bad free corrupts the kernel's own slab allocator within the same security authority as the nfsd thread. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Freeing an uninitialized pointer — and in the READDIR loop, double-freeing an already-released SELinux context buffer that another allocation now owns — yields a use-after-free giving the attacker a stale reference to live kernel objects, which is the standard primitive for disclosing arbitrary kernel memory. The stack slot is also attacker-groomable via the preceding COMPOUND operations, making the freed target selectable.\nI:H - An arbitrary/double free is a full memory-corruption primitive: the reclaimed slab object can be sprayed with attacker-chosen data from concurrent NFS requests, producing a write primitive and control-flow hijack in kernel context. This is at least as strong as a plain use-after-free, which is scored High.\nA:H - kfree() on arbitrary uninitialized stack residue — a stack pointer, a non-slab address, or an already-freed object — triggers slab corruption, a BUG in the allocator, or an oops in the nfsd kthread, panicking the server. The trigger is repeatable at will, so an attacker can reliably take the NFS server down."
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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/nfsd/nfs4xdr.c"
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],
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"versions": [
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{
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"version": "f59388a579c6a395de8f7372b267d3abecd8d6bf",
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"lessThan": "dd65b324174a64558a16ebbf4c3266e5701185d0",
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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": "f59388a579c6a395de8f7372b267d3abecd8d6bf",
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"lessThan": "f58bab6fd4063913bd8321e99874b8239e9ba726",
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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/nfsd/nfs4xdr.c"
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],
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"versions": [
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{
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"version": "6.7",
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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": "6.7",
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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": "6.10.8",
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"lessThanOrEqual": "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": "6.11",
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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": "6.7",
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"versionEndExcluding": "6.10.8"
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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": "6.7",
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"versionEndExcluding": "6.11"
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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/dd65b324174a64558a16ebbf4c3266e5701185d0"
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},
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{
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"url": "https://git.kernel.org/stable/c/f58bab6fd4063913bd8321e99874b8239e9ba726"
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}
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],
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"title": "nfsd: ensure that nfsd4_fattr_args.context is zeroed out",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2024-09-29T15:05:16.231611Z",
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"id": "CVE-2024-46697",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-29T15:05:30.417Z"
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}
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}
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]
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}
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} |