Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: qfq: 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 qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. This patch checks whether the class was already added to the agg->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
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 041f410aec2c1751ee22b8b73ba05d38c3a6a602affected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 005a479540478a820c52de098e5e767e63e36f0aaffected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 0bf32d6fb1fcbf841bb9945570e0e2a70072c00faffected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 0aa23e0856b7cedb3c88d8e3d281c212c7e4fbebaffected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < a43783119e01849fbf2fe8855634e8989b240cb4affected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 53bc0b55178bd59bdd4bcd16349505cabf54b1a2affected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < 370218e8ce711684acc4cdd3cc3c6dd7956bc165affected37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea to < f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4affected
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/041f410aec2c1751ee22b8b73ba05d38c3a6a602 ↗
- https://git.kernel.org/stable/c/005a479540478a820c52de098e5e767e63e36f0a ↗
- https://git.kernel.org/stable/c/0bf32d6fb1fcbf841bb9945570e0e2a70072c00f ↗
- https://git.kernel.org/stable/c/0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb ↗
- https://git.kernel.org/stable/c/a43783119e01849fbf2fe8855634e8989b240cb4 ↗
- https://git.kernel.org/stable/c/53bc0b55178bd59bdd4bcd16349505cabf54b1a2 ↗
- https://git.kernel.org/stable/c/370218e8ce711684acc4cdd3cc3c6dd7956bc165 ↗
- https://git.kernel.org/stable/c/f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗
- https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html ↗