CVE-2025-38108
In the Linux kernel, the following vulnerability has been resolved: net_sched: red: fix a race in __red_change() Gerrard Tai reported a race condition in RED, whenever SFQ perturb timer fires at the wrong time.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: red: fix a race in __red_change() Gerrard Tai reported a race condition in RED, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/110a47efcf23438ff8d31dbd9c854fae2a48bf98Patch
- https://git.kernel.org/stable/c/2790c4ec481be45a80948d059cd7c9a06bc37493Patch
- https://git.kernel.org/stable/c/2a71924ca4af59ffc00f0444732b6cd54b153d0ePatch
- https://git.kernel.org/stable/c/444ad445df5496a785705019268a8a84b84484bbPatch
- https://git.kernel.org/stable/c/4b755305b2b0618e857fdadb499365b5f2e478d1Patch
- https://git.kernel.org/stable/c/85a3e0ede38450ea3053b8c45d28cf55208409b8Patch
- https://git.kernel.org/stable/c/a1bf6a4e9264a685b0e642994031f9c5aad72414Patch
- https://git.kernel.org/stable/c/f569984417a4e12c67366e69bdcb752970de921dPatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.