CVE-2026-31657

CRITICAL EPSS 31.7%
Published Apr 24, 20262mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Apr 24, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer. The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern. Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.

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
31.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 13

VendorProductVersionRange
linuxlinux_kernel*≥3.5.1  –  <6.1.169
linuxlinux_kernel*≥6.2  –  <6.6.135
linuxlinux_kernel*≥6.7  –  <6.12.82
linuxlinux_kernel*≥6.13  –  <6.18.23
linuxlinux_kernel*≥6.19  –  <6.19.13
linuxlinux_kernel3.5any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52
  • git.kernel.org https://git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6
  • git.kernel.org https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96
    Patch