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CVE-2025-38524rxrpc: Fix recv-recv race of completed call

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.

Timeline

  1. ID reserved

    By Linux

  2. · 4 months later

    Published

  3. · 15 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-38524, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Modified3.1Medium4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.32% · top 75% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

  • Linux · Linux

    • affected 248f219cb8bcbfbd7f132752d44afa2df7c241d1 – < 4aed0eeca58e26d752bb08b293b8dc75c6820b23
    • affected 248f219cb8bcbfbd7f132752d44afa2df7c241d1 – < cb720b068b18fb39c96980eb3c13f09427512be7
    • affected 248f219cb8bcbfbd7f132752d44afa2df7c241d1 – < 7692bde890061797f3dece0148d7859e85c55778
    • affected 248f219cb8bcbfbd7f132752d44afa2df7c241d1 – < 839fe96c15209dc2255c064bb44b636efe04f032
    • affected 248f219cb8bcbfbd7f132752d44afa2df7c241d1 – < 6c75a97a32a5fa2060c3dd30207e63b6914b606d
    • affected 248f219cb8bcbfbd7f132752d44afa2df7c241d1 – < 962fb1f651c2cf2083e0c3ef53ba69e3b96d3fbc

  • Linux · Linux

    • affected 4.9
    • unaffected < 4.9
    • unaffected 5.10.266 – ≤ 5.10.*
    • unaffected 6.1.191 – ≤ 6.1.*
    • unaffected 6.6.100 – ≤ 6.6.*
    • unaffected 6.12.40 – ≤ 6.12.*
    • unaffected 6.15.8 – ≤ 6.15.*
    • unaffected 6.16 – ≤ *

References

References6

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .