CVE-2026-43091

HIGH EPSS 2.9%
Published May 6, 20261mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published May 6, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: Wait for RCU readers during policy netns exit xfrm_policy_fini() frees the policy_bydst hash tables after flushing the policy work items and deleting all policies, but it does not wait for concurrent RCU readers to leave their read-side critical sections first. The policy_bydst tables are published via rcu_assign_pointer() and are looked up through rcu_dereference_check(), so netns teardown must also wait for an RCU grace period before freeing the table memory. Fix this by adding synchronize_rcu() before freeing the policy hash tables.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥4.9  –  <6.6.136
linuxlinux_kernel*≥6.7  –  <6.12.83
linuxlinux_kernel*≥6.13  –  <6.18.24
linuxlinux_kernel*≥6.19  –  <6.19.14
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937
    Patch