CVE-2026-53079

In 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.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76	Patch
https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf	Patch

Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

History

23 Jul 2026, 18:38

Type	Values Removed	Values Added
First Time		Linux linux Kernel Linux
References	~~() https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76 -~~	() https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76 - Patch
References	~~() https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf -~~	() https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf - Patch
CPE		cpe:2.3:o:linux:linux_kernel::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
CWE		CWE-401

24 Jun 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-24 17:17

Updated : 2026-07-23 18:38

NVD link : CVE-2026-53079

Mitre link : CVE-2026-53079

CVE.ORG link : CVE-2026-53079

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

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