CVE-2024-46696

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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 \u2014 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"}}]}}

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{"bugzilla": {"description": "kernel: nfsd: fix potential UAF in nfsd4_cb_getattr_release", "id": "2312084", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2312084"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnfsd: fix potential UAF in nfsd4_cb_getattr_release\nOnce we drop the delegation reference, the fields embedded in it are no\nlonger safe to access. Do that last."], "name": "CVE-2024-46696", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not 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-2024-46696\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-46696\nhttps://lore.kernel.org/linux-cve-announce/2024091340-CVE-2024-46696-a8c1@gregkh/T"], "statement": "This flaw has currently no known exploit.", "threat_severity": "Moderate"}

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