EUVD-2026-38852
GHSA-29w2-r4qv-vcrw
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local access with low privilege required; netem reorder configuration is an operator prerequisite; impact is availability-only via unbounded kernel queue growth.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
net/sched: netem: fix queue limit check to include reordered packets
The queue limit check in netem_enqueue() uses q->t_len which only counts packets in the internal tfifo. Packets placed in sch->q by the reorder path (__qdisc_enqueue_head) are not counted, allowing the total queue occupancy to exceed sch->limit under reordering.
Include sch->q.qlen in the limit check.
AnalysisAI
Unbounded queue growth in the Linux kernel's netem (Network Emulator) traffic control subsystem allows a local low-privileged user to exhaust kernel memory and trigger a denial of service. The flaw exists because netem_enqueue() enforces queue depth limits using only q->t_len (packets in the internal tfifo), while packets placed into sch->q via the reorder path (__qdisc_enqueue_head) are silently excluded from that count, allowing total queue occupancy to grow beyond sch->limit without bound. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) local low-privilege access to the target system (CVSS PR:L confirmed); (2) a netem qdisc instance must be explicitly configured on a network interface - this is a non-default, operator-deployed configuration typically present only in network testing, emulation labs, or CI environments; (3) the netem instance must have reordering enabled (e.g., via 'tc qdisc add dev <if> root netem reorder <prob> ...'). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) is well-calibrated for this vulnerability: local access and low privilege are the binding constraints that prevent broader exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged local user on a Linux development or network-testing host where netem is configured with reordering enabled continuously injects packets into the netem-controlled interface. Because packets routed through the reorder path accumulate in sch->q without being counted against the queue limit, the queue grows without bound, consuming kernel memory until the system becomes unresponsive or the OOM killer is triggered. … |
| Remediation | Apply the vendor-released stable kernel update for the branch in use: upgrade to Linux 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10, or 7.1 as appropriate. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Same technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today