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    "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"
    },
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            },
            "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."
                }
            ],
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                        "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."
                        }
                    ]
                }
            ],
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
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                    ],
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                            "status": "affected",
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                        "fs/nfsd/nfs4state.c"
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.11",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/e0b66698a5ae41078f7490e8b3527013f5fccd6c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1116e0e372eb16dd907ec571ce5d4af325c55c10"
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            ],
            "title": "nfsd: fix potential UAF in nfsd4_cb_getattr_release",
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                                "timestamp": "2024-09-29T15:05:32.048367Z",
                                "id": "CVE-2024-46696",
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                                        "Exploitation": "none"
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