{"id":"CVE-2026-74259","summary":"cifs: remove all cifs files before kill super","details":"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}","modified":"2026-08-18T03:56:28.353513002Z","published":"2026-08-15T05:57:36.937Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74259.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4465ebe67d89345954bb3622b25dd13e06f9d367"},{"type":"WEB","url":"https://git.kernel.org/stable/c/55fb9581986141659002264fdc75cef307811eb8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7839f1817a0cb6c4ed5cfe25d04845c43380a129"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74259.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74259"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"708c276f516d27beaded7f372ac8111cee43926c"},{"fixed":"55fb9581986141659002264fdc75cef307811eb8"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0629a1a187e424373364d681b42b101894bdb548"},{"fixed":"4465ebe67d89345954bb3622b25dd13e06f9d367"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd"},{"fixed":"3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f655467a9973f964b267871e5fef533ad5014494"},{"fixed":"21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"340cea84f691c5206561bb2e0147158fe02070be"},{"fixed":"7839f1817a0cb6c4ed5cfe25d04845c43380a129"},{"fixed":"6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"30afc6ea72cc6cf7c8d579e79b64232801c38d08"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.167"},{"fixed":"6.1.178"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.130"},{"fixed":"6.6.145"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.78"},{"fixed":"6.12.97"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.18.20"},{"fixed":"6.18.40"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.19.10"},{"fixed":"6.20"}]}],"versions":["v6.1.177","v6.1.176","v6.1.175","v6.1.174","v6.1.173","v6.1.172","v6.1.171","v6.1.170","v6.1.169","v6.1.168","v6.1.167","v6.6.144","v6.6.143","v6.6.142","v6.6.141","v6.6.140","v6.6.139","v6.6.138","v6.6.137","v6.6.136","v6.6.135","v6.6.134","v6.6.133","v6.6.132","v6.6.131","v6.6.130","v6.12.96","v6.12.95","v6.12.94","v6.12.93","v6.12.92","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.12.83","v6.12.82","v6.12.81","v6.12.80","v6.12.79","v6.12.78","v6.18.39","v6.18.38","v6.18.37","v6.18.36","v6.18.35","v6.18.34","v6.18.33","v6.18.32","v6.18.31","v6.18.30","v6.18.29","v6.18.28","v6.18.27","v6.18.26","v6.18.25","v6.18.24","v6.18.23","v6.18.22","v6.18.21","v6.18.20","v6.19-rc2","v6.19","v6.19.9","v6.19.8","v6.19.7","v6.19.6","v6.19.5","v6.19.4","v6.19.3","v6.19.2","v6.19.1","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.19-rc3","v6.18","v6.18-rc1","v6.18-rc7","v6.18-rc3","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.18-rc4","v6.17","v6.17-rc7","v6.17-rc1","v6.17-rc2","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.16-rc6","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.14-rc3","v6.15","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.15-rc5","v6.14","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.14-rc4","v6.14-rc5","v6.14-rc2","v6.13","v6.13-rc1","v6.13-rc6","v6.13-rc7","v6.13-rc2","v6.13-rc5","v6.13-rc3","v6.12-rc1","v6.13-rc4","v6.12","v6.12-rc7","v6.12-rc3","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.12-rc2","v6.11-rc1","v6.11-rc5","v6.11","v6.11-rc7","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.11-rc4","v6.11-rc2","v6.10","v6.10-rc6","v6.10-rc7","v6.10-rc3","v6.9-rc1","v6.10-rc5","v6.10-rc2","v6.10-rc4","v6.9","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6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