CVE-2024-46697

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No local access is needed \u2014 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 \u2014 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 \u2014 and in the READDIR loop, double-freeing an already-released SELinux context buffer that another allocation now owns \u2014 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 \u2014 a stack pointer, a non-slab address, or an already-freed object \u2014 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4xdr.c"], "versions": [{"version": "f59388a579c6a395de8f7372b267d3abecd8d6bf", "lessThan": "dd65b324174a64558a16ebbf4c3266e5701185d0", "status": "affected", "versionType": "git"}, {"version": "f59388a579c6a395de8f7372b267d3abecd8d6bf", "lessThan": "f58bab6fd4063913bd8321e99874b8239e9ba726", "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/nfs4xdr.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "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": "6.7", "versionEndExcluding": "6.10.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/dd65b324174a64558a16ebbf4c3266e5701185d0"}, {"url": "https://git.kernel.org/stable/c/f58bab6fd4063913bd8321e99874b8239e9ba726"}], "title": "nfsd: ensure that nfsd4_fattr_args.context is zeroed out", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-09-29T15:05:16.231611Z", "id": "CVE-2024-46697", "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": "2024-09-29T15:05:30.417Z"}}]}}

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{"affected_release": [{"advisory": "RHSA-2024:11486", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.19.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-12-19T00:00:00Z"}, {"advisory": "RHSA-2024:11486", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.19.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-12-19T00:00:00Z"}], "bugzilla": {"description": "kernel: nfsd: ensure that nfsd4_fattr_args.context is zeroed out", "id": "2312085", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2312085"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-457", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnfsd: ensure that nfsd4_fattr_args.context is zeroed out\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."], "name": "CVE-2024-46697", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-46697\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46697\nhttps://lore.kernel.org/linux-cve-announce/2024091341-CVE-2024-46697-d166@gregkh/T"], "threat_severity": "Moderate"}

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