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.
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 5.0 | 5.4.295 |
| linux / linux_kernel | 5.5 | 5.10.239 |
| linux / linux_kernel | 5.11 | 5.15.186 |
| linux / linux_kernel | 5.16 | 6.1.142 |
| linux / linux_kernel | 6.2 | 6.6.94 |
| linux / linux_kernel | 6.7 | 6.12.34 |
| linux / linux_kernel | 6.13 | 6.15.3 |
| linux / linux_kernel | 6.16-rc1 | 6.16-rc1.x |
| debian / debian_linux | 11.0 | 11.0.x |
- https://git.kernel.org/stable/c/110a47efcf23438ff8d31dbd9c854fae2a48bf98
- https://git.kernel.org/stable/c/2790c4ec481be45a80948d059cd7c9a06bc37493
- https://git.kernel.org/stable/c/2a71924ca4af59ffc00f0444732b6cd54b153d0e
- https://git.kernel.org/stable/c/444ad445df5496a785705019268a8a84b84484bb
- https://git.kernel.org/stable/c/4b755305b2b0618e857fdadb499365b5f2e478d1
- https://git.kernel.org/stable/c/85a3e0ede38450ea3053b8c45d28cf55208409b8
- https://git.kernel.org/stable/c/a1bf6a4e9264a685b0e642994031f9c5aad72414
- https://git.kernel.org/stable/c/f569984417a4e12c67366e69bdcb752970de921d
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
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