{"api_version":"1","generated_at":"2026-08-22T09:16:43+00:00","cve":"CVE-2026-74259","urls":{"html":"https://cve.report/CVE-2026-74259","api":"https://cve.report/api/cve/CVE-2026-74259.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74259","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74259"},"summary":{"title":"cifs: remove all cifs files before kill super","description":"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}","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:25","updated_at":"2026-08-17 06:19:19"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/7839f1817a0cb6c4ed5cfe25d04845c43380a129","name":"https://git.kernel.org/stable/c/7839f1817a0cb6c4ed5cfe25d04845c43380a129","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1","name":"https://git.kernel.org/stable/c/6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71","name":"https://git.kernel.org/stable/c/3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7","name":"https://git.kernel.org/stable/c/21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4465ebe67d89345954bb3622b25dd13e06f9d367","name":"https://git.kernel.org/stable/c/4465ebe67d89345954bb3622b25dd13e06f9d367","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/55fb9581986141659002264fdc75cef307811eb8","name":"https://git.kernel.org/stable/c/55fb9581986141659002264fdc75cef307811eb8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74259","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74259","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 708c276f516d27beaded7f372ac8111cee43926c 55fb9581986141659002264fdc75cef307811eb8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0629a1a187e424373364d681b42b101894bdb548 4465ebe67d89345954bb3622b25dd13e06f9d367 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd 3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f655467a9973f964b267871e5fef533ad5014494 21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 340cea84f691c5206561bb2e0147158fe02070be 7839f1817a0cb6c4ed5cfe25d04845c43380a129 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 340cea84f691c5206561bb2e0147158fe02070be 6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 30afc6ea72cc6cf7c8d579e79b64232801c38d08 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.167 6.1.178 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.130 6.6.145 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.78 6.12.97 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.20 6.18.40 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19.10 6.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74259","cve":"CVE-2026-74259","epss":"0.001820000","percentile":"0.081080000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:46"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/client/connect.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"55fb9581986141659002264fdc75cef307811eb8","status":"affected","version":"708c276f516d27beaded7f372ac8111cee43926c","versionType":"git"},{"lessThan":"4465ebe67d89345954bb3622b25dd13e06f9d367","status":"affected","version":"0629a1a187e424373364d681b42b101894bdb548","versionType":"git"},{"lessThan":"3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71","status":"affected","version":"0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd","versionType":"git"},{"lessThan":"21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7","status":"affected","version":"f655467a9973f964b267871e5fef533ad5014494","versionType":"git"},{"lessThan":"7839f1817a0cb6c4ed5cfe25d04845c43380a129","status":"affected","version":"340cea84f691c5206561bb2e0147158fe02070be","versionType":"git"},{"lessThan":"6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1","status":"affected","version":"340cea84f691c5206561bb2e0147158fe02070be","versionType":"git"},{"status":"affected","version":"30afc6ea72cc6cf7c8d579e79b64232801c38d08","versionType":"git"},{"lessThan":"6.1.178","status":"affected","version":"6.1.167","versionType":"semver"},{"lessThan":"6.6.145","status":"affected","version":"6.6.130","versionType":"semver"},{"lessThan":"6.12.97","status":"affected","version":"6.12.78","versionType":"semver"},{"lessThan":"6.18.40","status":"affected","version":"6.18.20","versionType":"semver"},{"lessThan":"6.20","status":"affected","version":"6.19.10","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/client/connect.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.0"},{"lessThan":"7.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"6.1.167","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"6.6.130","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"6.12.78","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"6.18.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"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."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:45:08.700Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/55fb9581986141659002264fdc75cef307811eb8"},{"url":"https://git.kernel.org/stable/c/4465ebe67d89345954bb3622b25dd13e06f9d367"},{"url":"https://git.kernel.org/stable/c/3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71"},{"url":"https://git.kernel.org/stable/c/21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7"},{"url":"https://git.kernel.org/stable/c/7839f1817a0cb6c4ed5cfe25d04845c43380a129"},{"url":"https://git.kernel.org/stable/c/6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1"}],"title":"cifs: remove all cifs files before kill super","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74259","datePublished":"2026-08-15T05:57:36.937Z","dateReserved":"2026-08-15T05:44:03.877Z","dateUpdated":"2026-08-17T05:45:08.700Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:25","lastModifiedDate":"2026-08-17 06:19:19","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74259","Ordinal":"1","Title":"cifs: remove all cifs files before kill super","CVE":"CVE-2026-74259","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74259","Ordinal":"1","NoteData":"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}","Type":"Description","Title":"cifs: remove all cifs files before kill super"}]}}}