CVE-2026-43377 json
ksmbd: Don't log keys in SMB3 signing and encryption key generation
published 2026-05-08 6 mo ago modified 2026-08-05 3 mo ago also EUVD-2026-28683
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 16%
- public exploits
- 0
- none known
Summary
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Don't log keys in SMB3 signing and encryption key generation
When KSMBD_DEBUG_AUTH logging is enabled, generate_smb3signingkey() and generate_smb3encryptionkey() log the session, signing, encryption, and decryption key bytes. Remove the logs to avoid exposing credentials.
Patch / fix
- Linux Linux 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.9, 7.0
- linux Debian 12 6.1.170-1
- linux Debian 13 6.12.85-1
- linux Debian 14 6.19.10-1
debian advisories DEBIAN-CVE-2026-43377
- 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-2026-43377
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
- git.kernel.org/stable/c/4084ed720d7d5f4e975c9e4a6267a552dad3b24a commit
- git.kernel.org/stable/c/fec5c70b82af3f59f15bb984df94e5ad1fccfb1e commit
- git.kernel.org/stable/c/3fe2d9ec166b7df9a8df6c0fdcfc210572e27e3f commit
- git.kernel.org/stable/c/407cc37c21d51f9b9d4d20204b04890880cfa6ae commit
- git.kernel.org/stable/c/c6b01b997a2094969e315f1ebfc1d64b8ae2163d commit
- git.kernel.org/stable/c/441336115df26b966575de56daf7107ed474faed 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-2026-43377 updated
kernel: ksmbd: Don't log keys in SMB3 signing and encryption key generation
-
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
0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Affected products
- Linux Linux
Classification
- Technology feeds
References
-
git.kernel.org
/stable/c/4084ed720d7d5f4e975c9e4a6267a552dad3b24a
patch
-
git.kernel.org
/stable/c/fec5c70b82af3f59f15bb984df94e5ad1fccfb1e
patch
-
git.kernel.org
/stable/c/3fe2d9ec166b7df9a8df6c0fdcfc210572e27e3f
patch
-
git.kernel.org
/stable/c/407cc37c21d51f9b9d4d20204b04890880cfa6ae
patch
-
git.kernel.org
/stable/c/c6b01b997a2094969e315f1ebfc1d64b8ae2163d
patch
-
git.kernel.org
/stable/c/441336115df26b966575de56daf7107ed474faed
patch
Sources
- CVE List CVE-2026-43377
- NVD CVE-2026-43377
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.