5.5

CVE-2025-38522

sched/ext: Prevent update_locked_rq() calls with NULL rq

In the Linux kernel, the following vulnerability has been resolved:

sched/ext: Prevent update_locked_rq() calls with NULL rq

Avoid invoking update_locked_rq() when the runqueue (rq) pointer is NULL
in the SCX_CALL_OP and SCX_CALL_OP_RET macros.

Previously, calling update_locked_rq(NULL) with preemption enabled could
trigger the following warning:

    BUG: using __this_cpu_write() in preemptible [00000000]

This happens because __this_cpu_write() is unsafe to use in preemptible
context.

rq is NULL when an ops invoked from an unlocked context. In such cases, we
don't need to store any rq, since the value should already be NULL
(unlocked). Ensure that update_locked_rq() is only called when rq is
non-NULL, preventing calling __this_cpu_write() on preemptible context.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.15.1 < 6.15.8
Linux ≫ Linux Kernel Version 6.15 Update -
Linux ≫ Linux Kernel Version 6.15 Update rc7
Linux ≫ Linux Kernel Version 6.16 Update rc1
Linux ≫ Linux Kernel Version 6.16 Update rc2
Linux ≫ Linux Kernel Version 6.16 Update rc3
Linux ≫ Linux Kernel Version 6.16 Update rc4
Linux ≫ Linux Kernel Version 6.16 Update rc5
Linux ≫ Linux Kernel Version 6.16 Update rc6
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.14% 0.035
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/237c43037b336e36a49eb9f2daac1c7719ec7f8b
Patch
https://git.kernel.org/stable/c/e14fd98c6d66cb76694b12c05768e4f9e8c95664
Patch