Not yet scoredPublished Dec 18, 2025

CVE-2025-68325net/sched: sch_cake: Fix incorrect qlen reduction in cake_drop

Updated under an hour ago (Oct 28, 2026, 9:10 AM ET)

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In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: Fix incorrect qlen reduction in cake_drop In cake_drop(), qdisc_tree_reduce_backlog() is used to update the qlen and backlog of the qdisc hierarchy. Its caller, cake_enqueue(), assumes that the parent qdisc will enqueue the current packet. However, this assumption breaks when cake_enqueue() returns NET_XMIT_CN: the parent qdisc stops enqueuing current packet, leaving the tree qlen/backlog accounting inconsistent. This mismatch can lead to a NULL dereference (e.g., when the parent Qdisc is qfq_qdisc). This patch computes the qlen/backlog delta in a more robust way by observing the difference before and after the series of cake_drop() calls, and then compensates the qdisc tree accounting if cake_enqueue() returns NET_XMIT_CN. To ensure correct compensation when ACK thinning is enabled, a new variable is introduced to keep qlen unchanged.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: May 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from de04ddd2980b48caa8d7e24a7db2742917a8b280 before a3f4e3de41a3f115db35276c6b186ccbc913934a; from 0dacfc5372e314d1219f03e64dde3ab495a5a25e before 38abf6e931b169ea88d7529b49096f53a5dcf8fe; from 710866fc0a64eafcb8bacd91bcb1329eb7e5035f before fcb91be52eb6e92e00b533ebd7c77fecada537e1; from aa12ee1c1bd260943fd6ab556d8635811c332eeb before d01f0e072dadb02fe10f436b940dd957aff0d7d4; from ff57186b2cc39766672c4c0332323933e5faaa88 before 0b6216f9b3d1c33c76f74511026e5de5385ee520; from 15de71d06a400f7fdc15bf377a2552b0ec437cf5 before 529c284cc2815c8350860e9a31722050fe7117cb; 15de71d06a400f7fdc15bf377a2552b0ec437cf5 builds before 3ed6c458530a547ed0c9ea0b02b19bab620be88b; 15de71d06a400f7fdc15bf377a2552b0ec437cf5 builds before 9fefc78f7f02d71810776fdeb119a05a946a27cc; and 9 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/a3f4e3de41a3f115db35276c6b186ccbc913934a
https://git.kernel.org/stable/c/38abf6e931b169ea88d7529b49096f53a5dcf8fe
https://git.kernel.org/stable/c/fcb91be52eb6e92e00b533ebd7c77fecada537e1
https://git.kernel.org/stable/c/d01f0e072dadb02fe10f436b940dd957aff0d7d4
https://git.kernel.org/stable/c/0b6216f9b3d1c33c76f74511026e5de5385ee520
https://git.kernel.org/stable/c/529c284cc2815c8350860e9a31722050fe7117cb
https://git.kernel.org/stable/c/3ed6c458530a547ed0c9ea0b02b19bab620be88b
https://git.kernel.org/stable/c/9fefc78f7f02d71810776fdeb119a05a946a27cc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.