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Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: Flush gso_skb list too during ->change() Previously, when reducing a qdisc's limit via the ->change() operation, only the main skb queue was trimmed, potentially leaving packets in the gso_skb list. This could result in NULL pointer dereference when we only check sch->limit against sch->q.qlen. This patch introduces a new helper, qdisc_dequeue_internal(), which ensures both the gso_skb list and the main queue are properly flushed when trimming excess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie) are updated to use this helper in their ->change() routines.

PUBLISHED Reserved 2025-04-16 | Published 2025-05-26 | Updated 2026-05-11 | Assigner Linux

Product status

Default status
unaffected

76e3cc126bb223013a6b9a0e2a51238d1ef2e409 (git) before ea1132ccb112f51ba749c56a912f67970c2cd542
affected

76e3cc126bb223013a6b9a0e2a51238d1ef2e409 (git) before d3336f746f196c6a53e0480923ae93939f047b6c
affected

76e3cc126bb223013a6b9a0e2a51238d1ef2e409 (git) before d38939ebe0d992d581acb6885c1723fa83c1fb2c
affected

76e3cc126bb223013a6b9a0e2a51238d1ef2e409 (git) before a7d6e0ac0a8861f6b1027488062251a8e28150fd
affected

76e3cc126bb223013a6b9a0e2a51238d1ef2e409 (git) before d1365ca80b012d8a7863e45949e413fb61fa4861
affected

76e3cc126bb223013a6b9a0e2a51238d1ef2e409 (git) before fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76
affected

76e3cc126bb223013a6b9a0e2a51238d1ef2e409 (git) before 2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8
affected

Default status
affected

3.5
affected

Any version before 3.5
unaffected

5.10.238 (semver)
unaffected

5.15.184 (semver)
unaffected

6.1.140 (semver)
unaffected

6.6.92 (semver)
unaffected

6.12.30 (semver)
unaffected

6.14.8 (semver)
unaffected

6.15 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/10/msg00007.html

lists.debian.org/debian-lts-announce/2025/08/msg00010.html

git.kernel.org/...c/ea1132ccb112f51ba749c56a912f67970c2cd542

git.kernel.org/...c/d3336f746f196c6a53e0480923ae93939f047b6c

git.kernel.org/...c/d38939ebe0d992d581acb6885c1723fa83c1fb2c

git.kernel.org/...c/a7d6e0ac0a8861f6b1027488062251a8e28150fd

git.kernel.org/...c/d1365ca80b012d8a7863e45949e413fb61fa4861

git.kernel.org/...c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76

git.kernel.org/...c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8

cve.org (CVE-2025-37992)

nvd.nist.gov (CVE-2025-37992)

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