CVE-2025-39900 — Race Condition in Linux

CWE-362 — Race Condition5 documents5 sources
Severity
5.5MEDIUMNVD
EPSS
0.0%
top 97.71%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
LinuxLinux KernelDebian Linux
Timeline
PublishedOct 1

Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: gen_estimator: fix est_timer() vs CONFIG_PREEMPT_RT=y syzbot reported a WARNING in est_timer() [1] Problem here is that with CONFIG_PREEMPT_RT=y, timer callbacks can be preempted. Adopt preempt_disable_nested()/preempt_enable_nested() to fix this. [1] WARNING: CPU: 0 PID: 16 at ./include/linux/seqlock.h:221 __seqprop_assert include/linux/seqlock.h:221 [inline] WARNING: CPU: 0 PID: 16 at ./include/linux/seqlock.h:…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages4 packages

▶NVDlinux/linux_kernel6.12 — 6.12.46+2
▶Debianlinux/linux_kernel< 6.12.48-1+1
▶CVEListV5linux/linuxd2d6422f8bd17c6bb205133e290625a564194496 — a22ec2ee824be30803068a52f78f7ffe3bc879fb+3
▶debiandebian/linux< linux 6.16.6-1 (forky)

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

2
OSV
CVE-2025-39900: In the Linux kernel, the following vulnerability has been resolved: net_sched: gen_estimator: fix est_timer() vs CONFIG_PREEMPT_RT=y syzbot reported a↗2025-10-01
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GHSA
GHSA-h5gr-wx7g-829q: In the Linux kernel, the following vulnerability has been resolved: net_sched: gen_estimator: fix est_timer() vs CONFIG_PREEMPT_RT=y syzbot reported↗2025-10-01
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📋Vendor Advisories

2
Red Hat
kernel: net_sched: gen_estimator: fix est_timer() vs CONFIG_PREEMPT_RT=y↗2025-10-01
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Debian
CVE-2025-39900: linux - In the Linux kernel, the following vulnerability has been resolved: net_sched: ...↗2025
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CVE-2025-39900 — Race Condition in Linux | cvebase