CVE-2025-21945: ksmbd: fix use-after-free in smb2_lock
First published: Tue Apr 01 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb2_lock If smb_lock->zero_len has value, ->llist of smb_lock is not delete and flock is old one. It will cause use-after-free on error handling routine.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.15<6.1.131 | |
| Linux Kernel | >=6.2<6.6.83 | |
| Linux Kernel | >=6.7<6.12.19 | |
| Linux Kernel | >=6.13<6.13.7 | |
| Linux Kernel | =6.14-rc1 | |
| Linux Kernel | =6.14-rc2 | |
| Linux Kernel | =6.14-rc3 | |
| Linux Kernel | =6.14-rc4 | |
| Linux Kernel | =6.14-rc5 |
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Reference Links
- https://git.kernel.org/stable/c/410ce35a2ed6d0e114132bba29af49b69880c8c7
- https://git.kernel.org/stable/c/8573571060ca466cbef2c6f03306b2cc7b883506
- https://git.kernel.org/stable/c/a0609097fd10d618aed4864038393dd75131289e
- https://git.kernel.org/stable/c/636e021646cf9b52ddfea7c809b018e91f2188cb
- https://git.kernel.org/stable/c/84d2d1641b71dec326e8736a749b7ee76a9599fc
Frequently Asked Questions
What is the severity of CVE-2025-21945?
CVE-2025-21945 is considered a moderate severity vulnerability due to the potential for use-after-free errors in the Linux kernel.
How do I fix CVE-2025-21945?
To fix CVE-2025-21945, upgrade to the patched version of the Linux kernel where this vulnerability has been resolved.
What components of the Linux kernel are affected by CVE-2025-21945?
CVE-2025-21945 specifically affects the ksmbd component of the Linux kernel.
What could happen if CVE-2025-21945 is exploited?
If exploited, CVE-2025-21945 could lead to a use-after-free vulnerability, potentially allowing for privilege escalation or system instability.
When was CVE-2025-21945 disclosed?
CVE-2025-21945 was publicly disclosed as a vulnerability in the Linux kernel related to the ksmbd file server.
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