Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: drr: 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 drr, 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 adding to the list to cover 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
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 5da3aad1a13e7edb8ff0778a444ccf49930313e9affected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 4b07ac06b0a712923255aaf2691637693fc7100daffected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 2968632880f1792007eedd12eeedf7f6e2b7e9f3affected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 4f0ecf50cdf76da95828578a92f130b653ac2fcfaffected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < db205b92dfe0501e5b92fb7cf00971d0e44ba3ebaffected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 26e75716b94d6ff9be5ea07d63675c4d189f30b4affected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < ab2248110738d4429668140ad22f530a9ee730e1affected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < f99a3fbf023e20b626be4b0f042463d598050c9aaffected
Linux Linux
Default version status: affected
5.0affected0 to < 5.0unaffected5.4.294 to ≤ 5.4.*unaffected5.10.238 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/5da3aad1a13e7edb8ff0778a444ccf49930313e9 ↗
- https://git.kernel.org/stable/c/4b07ac06b0a712923255aaf2691637693fc7100d ↗
- https://git.kernel.org/stable/c/2968632880f1792007eedd12eeedf7f6e2b7e9f3 ↗
- https://git.kernel.org/stable/c/4f0ecf50cdf76da95828578a92f130b653ac2fcf ↗
- https://git.kernel.org/stable/c/db205b92dfe0501e5b92fb7cf00971d0e44ba3eb ↗
- https://git.kernel.org/stable/c/26e75716b94d6ff9be5ea07d63675c4d189f30b4 ↗
- https://git.kernel.org/stable/c/ab2248110738d4429668140ad22f530a9ee730e1 ↗
- https://git.kernel.org/stable/c/f99a3fbf023e20b626be4b0f042463d598050c9a ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗
- https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html ↗