CVE-2026-31638

HIGH EPSS 35.2%
Published Apr 24, 20262mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Apr 24, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Only put the call ref if one was acquired rxrpc_input_packet_on_conn() can process a to-client packet after the current client call on the channel has already been torn down. In that case chan->call is NULL, rxrpc_try_get_call() returns NULL and there is no reference to drop. The client-side implicit-end error path does not account for that and unconditionally calls rxrpc_put_call(). This turns a protocol error path into a kernel crash instead of rejecting the packet. Only drop the call reference if one was actually acquired. Keep the existing protocol error handling unchanged.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
35.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥6.2.1  –  <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_kernel6.2any
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/0c156aff8a2d4fa0d61db7837641975cf0e5452d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd
    Patch