In the Linux kernel, the following vulnerability has been resolved: net_sched: ets: fix a race in ets_qdisc_change() Gerrard Tai reported a race condition in ETS, 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.
Fix
Patch, vendor advisory and mitigation references on NVD 7
- https://git.kernel.org/stable/c/0383b25488a545be168744336847549d4a2d3d6c Patch
- https://git.kernel.org/stable/c/073f64c03516bcfaf790f8edc772e0cfb8a84ec3 Patch
- https://git.kernel.org/stable/c/0b479d0aa488cb478eb2e1d8868be946ac8afb4f Patch
- https://git.kernel.org/stable/c/347867cb424edae5fec1622712c8dd0a2c42918f Patch
- https://git.kernel.org/stable/c/d92adacdd8c2960be856e0b82acc5b7c5395fddb Patch
- https://git.kernel.org/stable/c/eb7b74e9754e1ba2088f914ad1f57a778b11894b Patch
- https://git.kernel.org/stable/c/fed94bd51d62d2e0e006aa61480e94e5cd0582b0 Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.0 · linux, debianNVD modified 2026-10-15 22:18
Affected (CPE criteria) 8
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.0:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.0:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.0:rc5:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.0:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.0:rc7:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
References 9
- https://git.kernel.org/stable/c/0383b25488a545be168744336847549d4a2d3d6c Patch
- https://git.kernel.org/stable/c/073f64c03516bcfaf790f8edc772e0cfb8a84ec3 Patch
- https://git.kernel.org/stable/c/0b479d0aa488cb478eb2e1d8868be946ac8afb4f Patch
- https://git.kernel.org/stable/c/347867cb424edae5fec1622712c8dd0a2c42918f Patch
- https://git.kernel.org/stable/c/d92adacdd8c2960be856e0b82acc5b7c5395fddb Patch
- https://git.kernel.org/stable/c/eb7b74e9754e1ba2088f914ad1f57a778b11894b Patch
- https://git.kernel.org/stable/c/fed94bd51d62d2e0e006aa61480e94e5cd0582b0 Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Mailing List, Third Party Advisory