CVE-2026-43379ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
- 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 in smb_lazy_parent_lease_break_close() opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being accessed after rcu_read_unlock() has been called. This creates a race condition where the memory could be freed by a concurrent writer between the unlock and the subsequent pointer dereferences (opinfo->is_lease, etc.), leading to a use-after-free.
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 27b40b7bfcd121fe13a150ffe11957630cf49246 – < bf4d66d72e4a9e268c1012c331ce9eaedb5e2086
- affected 5fb282ba4fef8985a5acf2b32681f2ec07732561 – < 960699317d39f46611f4ebeb69edc567c1f4e6b6
- affected 5fb282ba4fef8985a5acf2b32681f2ec07732561 – < dbbd328cf58261ca239756fe1c0d10c9518d3399
- affected 5fb282ba4fef8985a5acf2b32681f2ec07732561 – < b3568347c51c46e2cabc356bc34676df98296619
- affected 5fb282ba4fef8985a5acf2b32681f2ec07732561 – < eac3361e3d5dd8067b3258c69615888eb45e9f25
- affected 6.6.32 – < 6.6.130
- affected 6.9
- unaffected < 6.9
- 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/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086 (opens in a new tab)
- https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6 (opens in a new tab)
- https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399 (opens in a new tab)
- https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619 (opens in a new tab)
- https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25 (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-2026-28685 (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-2026-43379)Record last updated .