Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: ets: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of ets, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. In addition to checking for qlen being zero, this patch checks whether the class was already added to the active_list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 24388ba0a1b1b6d4af1b205927ac7f7b119ee4eaaffecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 554acc5a2ea9703e08023eb9a003f9e5a830a502affecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990affecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3affecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 1f01e9f961605eb397c6ecd1d7b0233dfbf9077caffecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < bc321f714de693aae06e3786f88df2975376d996affecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 1a6d0c00fa07972384b0c308c72db091d49988b6affected
Linux Linux
Default version status: affected
5.6affected0 to < 5.6unaffected5.10.238 to ≤ 5.10.*unaffected5.15.182 to ≤ 5.15.*unaffected6.1.138 to ≤ 6.1.*unaffected6.6.90 to ≤ 6.6.*unaffected6.12.28 to ≤ 6.12.*unaffected6.14.6 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/24388ba0a1b1b6d4af1b205927ac7f7b119ee4ea ↗
- https://git.kernel.org/stable/c/554acc5a2ea9703e08023eb9a003f9e5a830a502 ↗
- https://git.kernel.org/stable/c/9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990 ↗
- https://git.kernel.org/stable/c/72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3 ↗
- https://git.kernel.org/stable/c/1f01e9f961605eb397c6ecd1d7b0233dfbf9077c ↗
- https://git.kernel.org/stable/c/bc321f714de693aae06e3786f88df2975376d996 ↗
- https://git.kernel.org/stable/c/1a6d0c00fa07972384b0c308c72db091d49988b6 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗
- https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html ↗