by Kastro
Paper/Archive/CVE-2026-43379

CVE-2026-43379

Linux Linux — ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 38.7.387 × 207.7No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Linux27b40b7bfcd121fe13a150ffe11957630cf49246 – < bf4d66d72e4a9e268c1012c331ce9eaedb5e2086bf4d66d72e4a9e268c1012c331ce9eaedb5e2086CNA
Linux5fb282ba4fef8985a5acf2b32681f2ec07732561 – < 960699317d39f46611f4ebeb69edc567c1f4e6b6960699317d39f46611f4ebeb69edc567c1f4e6b6CNA
Linux5fb282ba4fef8985a5acf2b32681f2ec07732561 – < dbbd328cf58261ca239756fe1c0d10c9518d3399dbbd328cf58261ca239756fe1c0d10c9518d3399CNA
Linux5fb282ba4fef8985a5acf2b32681f2ec07732561 – < b3568347c51c46e2cabc356bc34676df98296619b3568347c51c46e2cabc356bc34676df98296619CNA
Linux5fb282ba4fef8985a5acf2b32681f2ec07732561 – < eac3361e3d5dd8067b3258c69615888eb45e9f25eac3361e3d5dd8067b3258c69615888eb45e9f25CNA
Linux6.6.32 – < 6.6.1306.6.130CNA
Linux6.96.6.130CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refgit.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086refgit.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6refgit.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399refgit.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619refgit.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25