CVE - CVE-2025-21703

CVE-ID
CVE-2025-21703	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of the child qdisc before calling it. Otherwise it would miss the opportunity to call cops->qlen_notify(), in the case of DRR, it resulted in UAF since DRR uses ->qlen_notify() to maintain its active list.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5 URL:https://git.kernel.org/stable/c/1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5 MISC:https://git.kernel.org/stable/c/6312555249082d6d8cc5321ff725df05482d8b83 URL:https://git.kernel.org/stable/c/6312555249082d6d8cc5321ff725df05482d8b83 MISC:https://git.kernel.org/stable/c/638ba5089324796c2ee49af10427459c2de35f71 URL:https://git.kernel.org/stable/c/638ba5089324796c2ee49af10427459c2de35f71 MISC:https://git.kernel.org/stable/c/7b79ca9a1de6a428d486ff52fb3d602321c08f55 URL:https://git.kernel.org/stable/c/7b79ca9a1de6a428d486ff52fb3d602321c08f55 MISC:https://git.kernel.org/stable/c/839ecc583fa00fab785fde1c85a326743657fd32 URL:https://git.kernel.org/stable/c/839ecc583fa00fab785fde1c85a326743657fd32
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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