- 9.8CriticalCVSS base score
- 0.44%Exploitation in 30 daysEPSS · top 61% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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().
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.44% · top 61% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 296cb5457cc6f4a754c4ae29855f8a253d52bcc6 – < 302fef75512b2c8329a3f5efab1ae7ba2562387a
- affected d54ab1520d43e95f9b2e22d7a05fc9614192e5a5 – < 08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c
- affected 18b4fac5ef17f77fed9417d22210ceafd6525fc7 – < 1d6abf145615dbfe267ce3b0a271f95e3780e18e
- affected 18b4fac5ef17f77fed9417d22210ceafd6525fc7 – < ce8507ee82c888126d8e7565e27c016308d24cde
- affected 18b4fac5ef17f77fed9417d22210ceafd6525fc7 – < 1dfd062caa165ec9d7ee0823087930f3ab8a6294
- affected d73686367ad68534257cd88a36ca3c52cb8b81d8
- affected 6.6.88 – < 6.6.130
- affected 6.12.25 – < 6.12.78
- affected 6.14.4 – < 6.15
- affected 6.15
- unaffected < 6.15
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References5
- https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a (opens in a new tab)
- https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c (opens in a new tab)
- https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e (opens in a new tab)
- https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde (opens in a new tab)
- https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28682 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43376)Record last updated .