CVE-2025-21944 — Improper Locking in Linux

CWE-667 — Improper Locking42 documents7 sources
Severity
5.5MEDIUMNVD
OSV5.9OSV4.7
EPSS
0.1%
top 80.65%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
LinuxLinux KernelDebian Linux+2 more
Timeline
PublishedApr 1
Latest updateOct 15

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix bug on trap in smb2_lock If lock count is greater than 1, flags could be old value. It should be checked with flags of smb_lock, not flags. It will cause bug-on trap from locks_free_lock in error handling routine.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages7 packages

▶NVDlinux/linux_kernel5.15 — 6.1.131+4
▶Debianlinux/linux_kernel< 6.1.133-1+2
▶Ubuntulinux/linux_kernel< 6.8.0-84.84
▶CVEListV5linux/linux0626e6641f6b467447c81dd7678a69c66f7746cf — 11e0e74e14f1832a95092f2c98ed3b99f57797ee+5
▶debiandebian/linux< linux 6.1.133-1 (bookworm)

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

20
OSV
linux-oracle-6.8 vulnerabilities↗2025-10-15
▶
OSV
linux-azure-nvidia vulnerabilities↗2025-10-08
▶
OSV
linux-oracle vulnerabilities↗2025-10-06
▶
OSV
linux-azure, linux-azure-6.8 vulnerabilities↗2025-10-02
▶
OSV
linux-raspi-realtime vulnerabilities↗2025-10-02
▶

📋Vendor Advisories

21
Ubuntu
Linux kernel (Oracle) vulnerabilities↗2025-10-15
▶
Ubuntu
Linux kernel (Azure, N-Series) vulnerabilities↗2025-10-08
▶
Ubuntu
Linux kernel (Oracle) vulnerabilities↗2025-10-06
▶
Ubuntu
Linux kernel (Raspberry Pi Real-time) vulnerabilities↗2025-10-02
▶
Ubuntu
Linux kernel (HWE) vulnerabilities↗2025-10-02
▶