CVE-2026-23226 json
ksmbd: add chann_lock to protect ksmbd_chann_list xarray
published 2026-02-18 8 mo ago modified 2026-10-30 10 d ago also EUVD-2026-7675
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 43%
- public exploits
- 0
- none known
Summary
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: add chann_lock to protect ksmbd_chann_list xarray
ksmbd_chann_list xarray lacks synchronization, allowing use-after-free in multi-channel sessions (between lookup_chann_list() and ksmbd_chann_del).
Adds rw_semaphore chann_lock to struct ksmbd_session and protects all xa_load/xa_store/xa_erase accesses.
Patch / fix
- Linux Linux 5.16, 6.1.191, 6.3, 6.6.160, 6.12.77, 6.18.11, 6.19.1, 7.0
- linux Debian 13 6.12.85-1
- linux Debian 14 6.18.12-1
debian advisories DEBIAN-CVE-2026-23226
- linux Ubuntu 24.04 LTS 6.8.0-136.136
- linux-aws Ubuntu 24.04 LTS 6.8.0-1061.64
- linux-gcp Ubuntu 24.04 LTS 6.8.0-1064.72
- linux-gke Ubuntu 24.04 LTS 6.8.0-1059.67
- linux-ibm Ubuntu 24.04 LTS 6.8.0-1061.62
- linux-azure Ubuntu 24.04 LTS 6.8.0-1063.71
- linux-gkeop Ubuntu 24.04 LTS 6.8.0-1046.50
- linux-raspi Ubuntu 24.04 LTS 6.8.0-1061.65
ubuntu advisories UBUNTU-CVE-2026-23226
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel-source openSUSE Tumbleweed 6.19.8-1.1
opensuse advisories openSUSE-SU-2026:10387-1
- git.kernel.org/stable/c/c00f3938f7ac52770907768e440cf253af9cbb63 commit
- git.kernel.org/stable/c/43ad494ac6e940a8eabf25d5bd77bb3bb53b1153 commit
- git.kernel.org/stable/c/4c2ca31608521895dd742a43beca4b4d29762345 commit
- git.kernel.org/stable/c/e4a8a96a93d08570e0405cfd989a8a07e5b6ff33 commit
- git.kernel.org/stable/c/36ef605c0395b94b826a8c8d6f2697071173de6e commit
- git.kernel.org/stable/c/4f3a06cc57976cafa8c6f716646be6c79a99e485 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-23226 updated cvss 7.8
kernel: Linux kernel (ksmbd): Arbitrary code execution due to use-after-free
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernelnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Weakness
-
- CWE-416 Use After Free
- Technology feeds
References
- git.kernel.org /stable/c/c00f3938f7ac52770907768e440cf253af9cbb63
- git.kernel.org /stable/c/43ad494ac6e940a8eabf25d5bd77bb3bb53b1153
- git.kernel.org /stable/c/4c2ca31608521895dd742a43beca4b4d29762345
-
git.kernel.org
/stable/c/e4a8a96a93d08570e0405cfd989a8a07e5b6ff33
patch
-
git.kernel.org
/stable/c/36ef605c0395b94b826a8c8d6f2697071173de6e
patch
-
git.kernel.org
/stable/c/4f3a06cc57976cafa8c6f716646be6c79a99e485
patch
Sources
- CVE List CVE-2026-23226
- NVD CVE-2026-23226
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