PT-2025-22889 · Linux+6 · Linux Kernel+6
Published
2025-05-09
·
Updated
2026-04-20
·
CVE-2025-37992
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The issue concerns a NULL pointer dereference in the Linux kernel's net sched component. When reducing a qdisc's limit via the ->change() operation, only the main skb queue was trimmed, potentially leaving packets in the gso skb list. This could result in a NULL pointer dereference when checking sch->limit against sch->q.qlen. A new helper, qdisc dequeue internal(), has been introduced to ensure both the gso skb list and the main queue are properly flushed when trimming excess packets. All relevant qdiscs (codel, fq, fq codel, fq pie, hhf, pie) are updated to use this helper in their ->change() routines.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu