Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix null-deref in agg_dequeue To prevent a potential crash in agg_dequeue (net/sched/sch_qfq.c) when cl->qdisc->ops->peek(cl->qdisc) returns NULL, we check the return value before using it, similar to the existing approach in sch_hfsc.c. To avoid code duplication, the following changes are made: 1. Changed qdisc_warn_nonwc(include/net/pkt_sched.h) into a static inline function. 2. Moved qdisc_peek_len from net/sched/sch_hfsc.c to include/net/pkt_sched.h so that sch_qfq can reuse it. 3. Applied qdisc_peek_len in agg_dequeue to avoid crashing.
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 71d84658a61322e5630c85c5388fc25e4a2d08b2
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 99fc137f178797204d36ac860dd8b31e35baa2df
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 1bed56f089f09b465420bf23bb32985c305cfc28
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 3c2a8994807623c7655ece205667ae2cf74940aa
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 6ffa9d66187188e3068b5a3895e6ae1ee34f9199
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 6ff8e74c8f8a68ec07ef837b95425dfe900d060f
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before dd831ac8221e691e9e918585b1003c7071df0379
5.4.302 (semver)
5.10.247 (semver)
5.15.197 (semver)
6.1.159 (semver)
6.6.116 (semver)
6.12.57 (semver)
6.16 (original_commit_for_fix)
References
git.kernel.org/...c/71d84658a61322e5630c85c5388fc25e4a2d08b2
git.kernel.org/...c/99fc137f178797204d36ac860dd8b31e35baa2df
git.kernel.org/...c/1bed56f089f09b465420bf23bb32985c305cfc28
git.kernel.org/...c/3c2a8994807623c7655ece205667ae2cf74940aa
git.kernel.org/...c/6ffa9d66187188e3068b5a3895e6ae1ee34f9199
git.kernel.org/...c/6ff8e74c8f8a68ec07ef837b95425dfe900d060f
git.kernel.org/...c/dd831ac8221e691e9e918585b1003c7071df0379
Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.
