Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: Prevent creation of classes with TC_H_ROOT The function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination condition when traversing up the qdisc tree to update parent backlog counters. However, if a class is created with classid TC_H_ROOT, the traversal terminates prematurely at this class instead of reaching the actual root qdisc, causing parent statistics to be incorrectly maintained. In case of DRR, this could lead to a crash as reported by Mingi Cho. Prevent the creation of any Qdisc class with classid TC_H_ROOT (0xFFFFFFFF) across all qdisc types, as suggested by Jamal.
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
066a3b5b2346febf9a655b444567b7138e3bb939 to < e05d9938b1b0ac40b6054cc5fa0ccbd9afd5ed4caffected066a3b5b2346febf9a655b444567b7138e3bb939 to < 7a82fe67a9f4d7123d8e5ba8f0f0806c28695006affected066a3b5b2346febf9a655b444567b7138e3bb939 to < 003d92c91cdb5a64b25a9a74cb8543aac9a8bb48affected066a3b5b2346febf9a655b444567b7138e3bb939 to < e5ee00607bbfc97ef1526ea95b6b2458ac9e7cb7affected066a3b5b2346febf9a655b444567b7138e3bb939 to < 78533c4a29ac3aeddce4b481770beaaa4f3bfb67affected066a3b5b2346febf9a655b444567b7138e3bb939 to < 5c3ca9cb48b51bd72bf76b8b05e24f3cd53db5e7affected066a3b5b2346febf9a655b444567b7138e3bb939 to < 94edfdfb9505ab608e86599d1d1e38c83816fc1caffected066a3b5b2346febf9a655b444567b7138e3bb939 to < 0c3057a5a04d07120b3d0ec9c79568fceb9c921eaffected
Linux Linux
Default version status: affected
2.6.25affected0 to < 2.6.25unaffected5.4.292 to ≤ 5.4.*unaffected5.10.236 to ≤ 5.10.*unaffected5.15.180 to ≤ 5.15.*unaffected6.1.132 to ≤ 6.1.*unaffected6.6.84 to ≤ 6.6.*unaffected6.12.20 to ≤ 6.12.*unaffected6.13.8 to ≤ 6.13.*unaffected6.14 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/e05d9938b1b0ac40b6054cc5fa0ccbd9afd5ed4c ↗
- https://git.kernel.org/stable/c/7a82fe67a9f4d7123d8e5ba8f0f0806c28695006 ↗
- https://git.kernel.org/stable/c/003d92c91cdb5a64b25a9a74cb8543aac9a8bb48 ↗
- https://git.kernel.org/stable/c/e5ee00607bbfc97ef1526ea95b6b2458ac9e7cb7 ↗
- https://git.kernel.org/stable/c/78533c4a29ac3aeddce4b481770beaaa4f3bfb67 ↗
- https://git.kernel.org/stable/c/5c3ca9cb48b51bd72bf76b8b05e24f3cd53db5e7 ↗
- https://git.kernel.org/stable/c/94edfdfb9505ab608e86599d1d1e38c83816fc1c ↗
- https://git.kernel.org/stable/c/0c3057a5a04d07120b3d0ec9c79568fceb9c921e ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html ↗