8.4
HIGH CVSS 3.1
CVE-2026-74259
cifs: remove all cifs files before kill super
Description

In 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}

INFO

Published Date :

Aug. 15, 2026, 6:22 a.m.

Last Modified :

Aug. 17, 2026, 6:19 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2026-74259 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Update the Linux kernel to resolve a null pointer dereference during CIFS unmounting.
  • Update the Linux kernel.
  • Ensure all CIFS files are removed before unmounting.
  • Apply the 'cifs: remove all cifs files before kill super' patch.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-74259 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-74259 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-74259 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2026-74259 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '708c276f516d27beaded7f372ac8111cee43926c', 'lessThan': '55fb9581986141659002264fdc75cef307811eb8', 'versionType': 'git'}, {'status': 'affected', 'version': '0629a1a187e424373364d681b42b101894bdb548', 'lessThan': '4465ebe67d89345954bb3622b25dd13e06f9d367', 'versionType': 'git'}, {'status': 'affected', 'version': '0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd', 'lessThan': '3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71', 'versionType': 'git'}, {'status': 'affected', 'version': 'f655467a9973f964b267871e5fef533ad5014494', 'lessThan': '21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7', 'versionType': 'git'}, {'status': 'affected', 'version': '340cea84f691c5206561bb2e0147158fe02070be', 'lessThan': '7839f1817a0cb6c4ed5cfe25d04845c43380a129', 'versionType': 'git'}, {'status': 'affected', 'version': '340cea84f691c5206561bb2e0147158fe02070be', 'lessThan': '6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1', 'versionType': 'git'}, {'status': 'affected', 'version': '30afc6ea72cc6cf7c8d579e79b64232801c38d08', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.167', 'lessThan': '6.1.178', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.130', 'lessThan': '6.6.145', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.78', 'lessThan': '6.12.97', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.20', 'lessThan': '6.18.40', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.10', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['fs/smb/client/connect.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/smb/client/connect.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '708c276f516d27beaded7f372ac8111cee43926c', 'lessThan': '55fb9581986141659002264fdc75cef307811eb8', 'versionType': 'git'}, {'status': 'affected', 'version': '0629a1a187e424373364d681b42b101894bdb548', 'lessThan': '4465ebe67d89345954bb3622b25dd13e06f9d367', 'versionType': 'git'}, {'status': 'affected', 'version': '0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd', 'lessThan': '3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71', 'versionType': 'git'}, {'status': 'affected', 'version': 'f655467a9973f964b267871e5fef533ad5014494', 'lessThan': '21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7', 'versionType': 'git'}, {'status': 'affected', 'version': '340cea84f691c5206561bb2e0147158fe02070be', 'lessThan': '7839f1817a0cb6c4ed5cfe25d04845c43380a129', 'versionType': 'git'}, {'status': 'affected', 'version': '340cea84f691c5206561bb2e0147158fe02070be', 'lessThan': '6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1', 'versionType': 'git'}, {'status': 'affected', 'version': '30afc6ea72cc6cf7c8d579e79b64232801c38d08', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.167', 'lessThan': '6.1.178', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.130', 'lessThan': '6.6.145', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.78', 'lessThan': '6.12.97', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.20', 'lessThan': '6.18.40', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.10', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['fs/smb/client/connect.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/smb/client/connect.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '708c276f516d27beaded7f372ac8111cee43926c', 'lessThan': '55fb9581986141659002264fdc75cef307811eb8', 'versionType': 'git'}, {'status': 'affected', 'version': '0629a1a187e424373364d681b42b101894bdb548', 'lessThan': '4465ebe67d89345954bb3622b25dd13e06f9d367', 'versionType': 'git'}, {'status': 'affected', 'version': '0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd', 'lessThan': '3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71', 'versionType': 'git'}, {'status': 'affected', 'version': 'f655467a9973f964b267871e5fef533ad5014494', 'lessThan': '21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7', 'versionType': 'git'}, {'status': 'affected', 'version': '340cea84f691c5206561bb2e0147158fe02070be', 'lessThan': '7839f1817a0cb6c4ed5cfe25d04845c43380a129', 'versionType': 'git'}, {'status': 'affected', 'version': '340cea84f691c5206561bb2e0147158fe02070be', 'lessThan': '6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1', 'versionType': 'git'}, {'status': 'affected', 'version': '30afc6ea72cc6cf7c8d579e79b64232801c38d08', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.167', 'lessThan': '6.1.178', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.130', 'lessThan': '6.6.145', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.78', 'lessThan': '6.12.97', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.20', 'lessThan': '6.18.40', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.19.10', 'lessThan': '6.20', 'versionType': 'semver'}], 'programFiles': ['fs/smb/client/connect.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/smb/client/connect.c'], 'defaultStatus': 'affected'}]
    Added Description In 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}
    Added Reference https://git.kernel.org/stable/c/21303c4a2b7275e626c6b67de0f45f2d5b9bb3e7
    Added Reference https://git.kernel.org/stable/c/3baedc9b2f53e6a6ac57b16fdff0f9b954d9ca71
    Added Reference https://git.kernel.org/stable/c/4465ebe67d89345954bb3622b25dd13e06f9d367
    Added Reference https://git.kernel.org/stable/c/55fb9581986141659002264fdc75cef307811eb8
    Added Reference https://git.kernel.org/stable/c/6d9a4aaaa8b2612b5ef9d581e2f286a458b71ee1
    Added Reference https://git.kernel.org/stable/c/7839f1817a0cb6c4ed5cfe25d04845c43380a129
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.