{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74259",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.877Z",
        "datePublished": "2026-08-15T05:57:36.937Z",
        "dateUpdated": "2026-08-17T05:45:08.700Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T05:45:08.700Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: remove all cifs files before kill super\n\nCifs files may be put into fileinfo_put_wq during umounting cifs.\nAfter umount done, cifsFileInfo_put_final is called, which cause\nfollowing BUG:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\n[  134.222152]  list_lru_add+0x64/0x1a0\n[  134.222399]  ? cifs_put_tcon+0x171/0x340 [cifs]\n[  134.222772]  d_lru_add+0x44/0x60\n[  134.222997]  dput+0x1fc/0x210\n[  134.223213]  cifsFileInfo_put_final+0x11a/0x140 [cifs]\n[  134.223576]  process_one_work+0x17c/0x320\n[  134.223843]  worker_thread+0x188/0x280\n[  134.224084]  ? __pfx_worker_thread+0x10/0x10\n[  134.224366]  kthread+0xcc/0x100\n[  134.224576]  ? __pfx_kthread+0x10/0x10\n[  134.224827]  ret_from_fork+0x30/0x50\n[  134.225063]  ? __pfx_kthread+0x10/0x10\n[  134.225328]  ret_from_fork_asm+0x1b/0x30\n\nThis can be reproduce by following:\nunshare -n bash -c \"\nmkdir -p ${CIFS_MNT}\nip netns attach root 1\nip link add eth0 type veth peer veth0 netns root\nip link set eth0 up\nip -n root link set veth0 up\nip addr add 192.168.0.2/24 dev eth0\nip -n root addr add 192.168.0.1/24 dev veth0\nip route add default via 192.168.0.1 dev eth0\nip netns exec root sysctl net.ipv4.ip_forward=1\nip netns exec root iptables -t nat -A POSTROUTING -s 192.168.0.2 -o\n${DEV} -j MASQUERADE\nmount -t cifs ${CIFS_PATH} ${CIFS_MNT} -o\nvers=3.0,sec=ntlmssp,credentials=${CIFS_CRED},rsize=65536,wsize=65536,cache=none,echo_interval=1\ntouch ${CIFS_MNT}/a.txt\nip netns exec root iptables -t nat -D POSTROUTING -s 192.168.0.2 -o\n${DEV} -j MASQUERADE\n\"\numount ${CIFS_MNT}"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 8.4,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The flaw is reached via the local CIFS client umount/teardown path (umount syscall through cifs_kill_sb/cifs_umount), not from remote SMB packet receive handling; network/server behavior only influences deferred close timing.\nAC:L - An attacker controls both sides by opening files, provoking server-close failures (malicious SMB server or induced network loss as in the repro), and triggering umount, repeatedly hitting the async workqueue race without external timing luck.\nPR:N - A malicious or compromised remote SMB/CIFS server needs no credentials or privileges on the victim host; it only needs the client to have mounted the share and later umount, while the attacker drives failing close responses over the existing session.\nUI:N - No victim interaction beyond an already-established mount is required for the malicious-server scenario; a local attacker can also self-drive mount/open/umount to trigger the bug without another user performing actions.\nS:U - Exploitation corrupts or crashes kernel memory on the same host during CIFS unmount cleanup; it does not cross VM, container, or IOMMU security boundaries.\nC:H - cifsFileInfo_put_final() dereferences dentry, inode, and cifsInodeInfo after kill_anon_super() destroyed the superblock, constituting use-after-free that can expose adjacent kernel heap contents beyond the observed NULL dereference.\nI:H - Post-teardown cifsFileInfo_put_final() performs list_del, lock teardown, and kfree on potentially freed cinode/file structures, enabling heap corruption and potential control-flow hijack primitives typical of kernel UAF bugs.\nA:H - The bug produces a kernel NULL pointer dereference/oops in list_lru_add during dentry LRU insertion in the fileinfo_put_wq worker, reliably crashing or destabilizing the host when triggered."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/client/connect.c"
                    ],
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                            "version": "708c276f516d27beaded7f372ac8111cee43926c",
                            "lessThan": "55fb9581986141659002264fdc75cef307811eb8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0629a1a187e424373364d681b42b101894bdb548",
                            "lessThan": "4465ebe67d89345954bb3622b25dd13e06f9d367",
                            "status": "affected",
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                        },
                        {
                            "version": "0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd",
                            "lessThan": "3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f655467a9973f964b267871e5fef533ad5014494",
                            "lessThan": "21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "340cea84f691c5206561bb2e0147158fe02070be",
                            "lessThan": "7839f1817a0cb6c4ed5cfe25d04845c43380a129",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
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                            "lessThan": "6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1",
                            "status": "affected",
                            "versionType": "git"
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                        {
                            "version": "30afc6ea72cc6cf7c8d579e79b64232801c38d08",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.1.167",
                            "lessThan": "6.1.178",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.130",
                            "lessThan": "6.6.145",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.78",
                            "lessThan": "6.12.97",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.20",
                            "lessThan": "6.18.40",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.10",
                            "lessThan": "6.20",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/client/connect.c"
                    ],
                    "versions": [
                        {
                            "version": "7.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.178",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.145",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.97",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.40",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.1.167",
                                    "versionEndExcluding": "6.1.178"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6.130",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.18.20",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.0",
                                    "versionEndExcluding": "7.1.5"
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                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.0",
                                    "versionEndExcluding": "7.2"
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/55fb9581986141659002264fdc75cef307811eb8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4465ebe67d89345954bb3622b25dd13e06f9d367"
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                {
                    "url": "https://git.kernel.org/stable/c/3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71"
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                {
                    "url": "https://git.kernel.org/stable/c/6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1"
                }
            ],
            "title": "cifs: remove all cifs files before kill super",
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}