CVE-2026-43376ksmbd: fix use-after-free by using call_rcu() for oplock_info
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free by using call_rcu() for oplock_info ksmbd currently frees oplock_info immediately using kfree(), even though it is accessed under RCU read-side critical sections in places like opinfo_get() and proc_show_files(). Since there is no RCU grace period delay between nullifying the pointer and freeing the memory, a reader can still access oplock_info structure after it has been freed. This can leads to a use-after-free especially in opinfo_get() where atomic_inc_not_zero() is called on already freed memory. Fix this by switching to deferred freeing using call_rcu().
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 296cb5457cc6f4a754c4ae29855f8a253d52bcc6 before 302fef75512b2c8329a3f5efab1ae7ba2562387a; from d54ab1520d43e95f9b2e22d7a05fc9614192e5a5 before 08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c; 18b4fac5ef17f77fed9417d22210ceafd6525fc7 builds before 1d6abf145615dbfe267ce3b0a271f95e3780e18e; from 18b4fac5ef17f77fed9417d22210ceafd6525fc7 before ce8507ee82c888126d8e7565e27c016308d24cde; 18b4fac5ef17f77fed9417d22210ceafd6525fc7 builds before 1dfd062caa165ec9d7ee0823087930f3ab8a6294; d73686367ad68534257cd88a36ca3c52cb8b81d8; from 6.6.88 before 6.6.130; from 6.12.25 before 6.12.78; and 1 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 6.6.88 before 6.6.130; from 6.12.25 before 6.12.78; from 6.14.4 before 6.15; from 6.15.1 before 6.18.19; from 6.19 before 6.19.9; 6.15; 6.15; 6.15; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387apatch
- https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2cpatch
- https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18epatch
- https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cdepatch
- https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.