What’s Vulnerable › Vulnerabilities

CVE-2026-52984: net/sched: netem: fix queue limit check to include reordered packets

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-07-14

Description

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.

Affected products

• Linux kernel: from 5.4.288 before 5.5; from 5.10.232 before 5.10.258; from 5.15.175 before 5.15.209; from 6.1.121 before 6.1.175; from 6.6.67 before 6.6.141; from 6.12.6 before 6.12.91 — fixed in 5.10.258, 5.15.209, 5.5, 6.1.175, 6.12.91, 6.18.33

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 5.5, 6.1.175. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0f875d52db4c921da610e481b72f03cc82fdcb72
• https://git.kernel.org/stable/c/39a66e83ea41fe845631eeb8d326953de27d13f9
• https://git.kernel.org/stable/c/4185701fcce6b426b6c3630b25330dddd9c47b0d
• https://git.kernel.org/stable/c/54b5dbacd00dedffd5e2eed76de1c3839996b5e6
• https://git.kernel.org/stable/c/74fcd8e127200a50ee22ba2b45c164722bdb9177
• https://git.kernel.org/stable/c/8450462eaf91d5d2a9e863507b16d18e814baef3
• https://git.kernel.org/stable/c/936a7dd87251f6f3e88983350833edf60fe6a80b
• https://git.kernel.org/stable/c/ef9a41b3870fb90577da5b2de5bd140022d4021e

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