net_sched: fix skb memory leak in deferred qdisc drops

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Summary

CVECVE-2026-53079
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:21 UTC
Updated2026-06-24 17:17:21 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net_sched: fix skb memory leak in deferred qdisc drops When the network stack cleans up the deferred list via qdisc_run_end(), it operates on the root qdisc. If the root qdisc do not implement the TCQ_F_DEQUEUE_DROPS flag the packets queue to free are never freed and gets stranded on the child's local to_free list. Fix this by making qdisc_dequeue_drop() aware of the root qdisc. It fetches the root qdisc and check for the TCQ_F_DEQUEUE_DROPS flag. If the flag is present, the packet is appended directly to the root's to_free list. Otherwise, drop it directly as it was done before the optimization was implemented.

Risk And Classification

EPSS: 0.001450000 probability, percentile 0.041020000 (date 2026-06-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a6efc273ab8245722eee2150fa12cf75781dc410 bf26ad92ffda7884825d67b46bd5efe615c3babf git Not specified
CNA Linux Linux affected a6efc273ab8245722eee2150fa12cf75781dc410 a6bd339dbb3514bce690fdcf252e788dfab4ee76 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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