CVE-2025-38637

net_sched: skbprio: Remove overly strict queue assertions

MEDIUM
5.5
CVSS Score
Published: April 18, 2025 at 07:01 AM UTC
Updated: June 17, 2026 at 09:17 AM UTC
2 products affected across 2 vendorsLinux KernelDebian Linux

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%

Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: skbprio: Remove overly strict queue assertions In the current implementation, skbprio enqueue/dequeue contains an assertion that fails under certain conditions when SKBPRIO is used as a child qdisc under TBF with specific parameters. The failure occurs because TBF sometimes peeks at packets in the child qdisc without actually dequeuing them when tokens are unavailable. This peek operation creates a discrepancy between the parent and child qdisc queue length counters. When TBF later receives a high-priority packet, SKBPRIO's queue length may show a different value than what's reflected in its internal priority queue tracking, triggering the assertion. The fix removes this overly strict assertions in SKBPRIO, they are not necessary at all.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

4.19 ≤ v < 5.10.2364.19 ≤ v < 5.15.1804.19 ≤ v < 5.4.2924.19 ≤ v < 6.1.1344.19 ≤ v < 6.12.234.19 ≤ v < 6.13.114.19 ≤ v < 6.14.24.19 ≤ v < 6.154.19 ≤ v < 6.6.875.11 ≤ v < 5.15.1805.16 ≤ v < 6.1.1345.5 ≤ v < 5.10.2366.13 ≤ v < 6.13.116.14 ≤ v < 6.14.26.2 ≤ v < 6.6.876.7 ≤ v < 6.12.234.19aea5f654e6b78a0c976f7a25950155932c77a53f
Vendor states this is fixed in 034b293bf17c124fec0f0e663f81203b00aa7a50 (fixed)
Vendor states this is fixed in 1284733bab736e598341f1d3f3b94e2a322864a8 (fixed)
Vendor states this is fixed in 1dcc144c322a8d526b791135604c0663f1af9d85 (fixed)
Vendor states this is fixed in 2286770b07cb5268c03d11274b8efd43dff0d380 (fixed)
Vendor states this is fixed in 2f35b7673a3aa3d09b3eb05811669622ebaa98ca (fixed)
Vendor states this is fixed in 32ee79682315e6d3c99947b3f38b078a09a66919 (fixed)
Vendor states this is fixed in 7abc8318ce0712182bf0783dcfdd9a6a8331160e (fixed)
Vendor states this is fixed in 864ca690ff135078d374bd565b9872f161c614bc (fixed)
Vendor states this is fixed in ce8fe975fd99b49c29c42e50f2441ba53112b2e8 (fixed)
Vendor states this is fixed in 4.19 (unaffected)
Vendor states this is fixed in 5.10.236 (unaffected)
Vendor states this is fixed in 5.15.180 (unaffected)
Vendor states this is fixed in 5.4.292 (unaffected)
Vendor states this is fixed in 6.1.134 (unaffected)
Vendor states this is fixed in 6.12.23 (unaffected)
Vendor states this is fixed in 6.13.11 (unaffected)
Vendor states this is fixed in 6.14.2 (unaffected)
Vendor states this is fixed in 6.15 (unaffected)
Vendor states this is fixed in 6.6.87 (unaffected)

References (11)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/034b293bf17c124fec0f0e663f81203b00aa7a50
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/1284733bab736e598341f1d3f3b94e2a322864a8
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/1dcc144c322a8d526b791135604c0663f1af9d85
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/2286770b07cb5268c03d11274b8efd43dff0d380
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/2f35b7673a3aa3d09b3eb05811669622ebaa98ca
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/32ee79682315e6d3c99947b3f38b078a09a66919
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/7abc8318ce0712182bf0783dcfdd9a6a8331160e
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/864ca690ff135078d374bd565b9872f161c614bc

CVSS

Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-617

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