cifs: remove all cifs files before kill super

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74259
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:25 UTC
Updated2026-08-17 06:19:19 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cifs: remove all cifs files before kill super Cifs files may be put into fileinfo_put_wq during umounting cifs. After umount done, cifsFileInfo_put_final is called, which cause following BUG: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... [ 134.222152] list_lru_add+0x64/0x1a0 [ 134.222399] ? cifs_put_tcon+0x171/0x340 [cifs] [ 134.222772] d_lru_add+0x44/0x60 [ 134.222997] dput+0x1fc/0x210 [ 134.223213] cifsFileInfo_put_final+0x11a/0x140 [cifs] [ 134.223576] process_one_work+0x17c/0x320 [ 134.223843] worker_thread+0x188/0x280 [ 134.224084] ? __pfx_worker_thread+0x10/0x10 [ 134.224366] kthread+0xcc/0x100 [ 134.224576] ? __pfx_kthread+0x10/0x10 [ 134.224827] ret_from_fork+0x30/0x50 [ 134.225063] ? __pfx_kthread+0x10/0x10 [ 134.225328] ret_from_fork_asm+0x1b/0x30 This can be reproduce by following: unshare -n bash -c " mkdir -p ${CIFS_MNT} ip netns attach root 1 ip link add eth0 type veth peer veth0 netns root ip link set eth0 up ip -n root link set veth0 up ip addr add 192.168.0.2/24 dev eth0 ip -n root addr add 192.168.0.1/24 dev veth0 ip route add default via 192.168.0.1 dev eth0 ip netns exec root sysctl net.ipv4.ip_forward=1 ip netns exec root iptables -t nat -A POSTROUTING -s 192.168.0.2 -o ${DEV} -j MASQUERADE mount -t cifs ${CIFS_PATH} ${CIFS_MNT} -o vers=3.0,sec=ntlmssp,credentials=${CIFS_CRED},rsize=65536,wsize=65536,cache=none,echo_interval=1 touch ${CIFS_MNT}/a.txt ip netns exec root iptables -t nat -D POSTROUTING -s 192.168.0.2 -o ${DEV} -j MASQUERADE " umount ${CIFS_MNT}

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001820000 probability, percentile 0.081080000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 708c276f516d27beaded7f372ac8111cee43926c 55fb9581986141659002264fdc75cef307811eb8 git Not specified
CNA Linux Linux affected 0629a1a187e424373364d681b42b101894bdb548 4465ebe67d89345954bb3622b25dd13e06f9d367 git Not specified
CNA Linux Linux affected 0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd 3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71 git Not specified
CNA Linux Linux affected f655467a9973f964b267871e5fef533ad5014494 21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7 git Not specified
CNA Linux Linux affected 340cea84f691c5206561bb2e0147158fe02070be 7839f1817a0cb6c4ed5cfe25d04845c43380a129 git Not specified
CNA Linux Linux affected 340cea84f691c5206561bb2e0147158fe02070be 6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1 git Not specified
CNA Linux Linux affected 30afc6ea72cc6cf7c8d579e79b64232801c38d08 git Not specified
CNA Linux Linux affected 6.1.167 6.1.178 semver Not specified
CNA Linux Linux affected 6.6.130 6.6.145 semver Not specified
CNA Linux Linux affected 6.12.78 6.12.97 semver Not specified
CNA Linux Linux affected 6.18.20 6.18.40 semver Not specified
CNA Linux Linux affected 6.19.10 6.20 semver Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7839f1817a0cb6c4ed5cfe25d04845c43380a129 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4465ebe67d89345954bb3622b25dd13e06f9d367 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/55fb9581986141659002264fdc75cef307811eb8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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