CVE-2026-72057
Linux kernel net/sched bug: fragmented packets can clear qdisc metadata and trigger kernel WARN/panic.
Is CVE-2026-72057 being exploited?
Not confirmed. CVE-2026-72057 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.58% probability of exploitation in the next 30 days.
How severe is CVE-2026-72057?
CVE-2026-72057 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-72057?
Yes. A fix has been recorded for CVE-2026-72057. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72057 affect?
CVE-2026-72057 affects Linux kernel (net/sched, act_ct, tcf_ct), Systems using kernel network qdiscs/conntrack. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72057?
Apply vendor kernel update and reboot affected hosts immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote Denial of Service: crafted fragmented traffic can clear tc_skb_cb, trigger WARN_ON/ panic_on_warn and crash or stall kernel packet handling.
Patch when possible
- affected>= 0d76daf2013ce1da20eab5e26bd81d983e1c18fb and < fb080b6f54835d5d4d11ce3122800e6f0f6689e6
- affected>= ec624fe740b416fb68d536b37fb8eef46f90b5c2 and < 67d6b00a54446c008f52cf70fc0c2ad0c712f85d
- affected>= ec624fe740b416fb68d536b37fb8eef46f90b5c2 and < 2400c4b05d58834b994500a9eec90a37db44187c
- affected>= ec624fe740b416fb68d536b37fb8eef46f90b5c2 and < 5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac
- affected>= ec624fe740b416fb68d536b37fb8eef46f90b5c2 and < b3d835407846134b0d54637c0281b39bebef831d
- affected>= ec624fe740b416fb68d536b37fb8eef46f90b5c2 and < f7f45ceb855d9ba1cba594fb3f383255f7013fad
- affected>= ec624fe740b416fb68d536b37fb8eef46f90b5c2 and < 9092e15defbe6c7bc241c306093ca9d358a578e7
- affected>= 5.15.13 and < 5.15.217
- affected5.16
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.