CVE-2025-38524

MEDIUM EPSS 1.2%
Published Aug 16, 202510mo ago · Modified Jun 17, 20261w ago
4.7 CVSS 3.1
Medium
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Published Aug 16, 2025 10mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recv-recv race of completed call If a call receives an event (such as incoming data), the call gets placed on the socket's queue and a thread in recvmsg can be awakened to go and process it. Once the thread has picked up the call off of the queue, further events will cause it to be requeued, and once the socket lock is dropped (recvmsg uses call->user_mutex to allow the socket to be used in parallel), a second thread can come in and its recvmsg can pop the call off the socket queue again. In such a case, the first thread will be receiving stuff from the call and the second thread will be blocked on call->user_mutex. The first thread can, at this point, process both the event that it picked call for and the event that the second thread picked the call for and may see the call terminate - in which case the call will be "released", decoupling the call from the user call ID assigned to it (RXRPC_USER_CALL_ID in the control message). The first thread will return okay, but then the second thread will wake up holding the user_mutex and, if it sees that the call has been released by the first thread, it will BUG thusly: kernel BUG at net/rxrpc/recvmsg.c:474! Fix this by just dequeuing the call and ignoring it if it is seen to be already released. We can't tell userspace about it anyway as the user call ID has become stale.

CVSS Details

Base Score
4.7
Exploitability
1.0
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
1.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-362

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥4.9  –  <6.6.100
linuxlinux_kernel*≥6.7  –  <6.12.40
linuxlinux_kernel*≥6.13  –  <6.15.8
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/6c75a97a32a5fa2060c3dd30207e63b6914b606d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7692bde890061797f3dece0148d7859e85c55778
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/839fe96c15209dc2255c064bb44b636efe04f032
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/962fb1f651c2cf2083e0c3ef53ba69e3b96d3fbc
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/6c75a97a32a5fa2060c3dd30207e63b6914b606d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7692bde890061797f3dece0148d7859e85c55778
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/839fe96c15209dc2255c064bb44b636efe04f032
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/962fb1f651c2cf2083e0c3ef53ba69e3b96d3fbc
    Patch