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.

An update of the linux package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2025-68325)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
297435	Photon OS 4.0: Linux PHSA-2026-4.0-0953	Nessus	PhotonOS Local Security Checks	medium
297260	Photon OS 5.0: Linux PHSA-2026-5.0-0741	Nessus	PhotonOS Local Security Checks	medium
279256	Linux Distros Unpatched Vulnerability : CVE-2025-68325	Nessus	Misc.	medium

Detections

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CVE-2025-68325

medium

Tenable Plugins

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medium

medium