CVE-2026-43376

CRITICAL EPSS 35.5%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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().

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
35.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥6.6.88  –  <6.6.130
linuxlinux_kernel*≥6.12.25  –  <6.12.78
linuxlinux_kernel*≥6.14.4  –  <6.15
linuxlinux_kernel*≥6.15.1  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde
    Patch