What is CVE-2026-72057?

CVE-2026-72057 is a High severity Linux kernel vulnerability with a CVSS score of 8.2 out of 10, affecting Linux kernel versions from 5.15.13 onward and patched in 5.15.217, 6.1.184, 6.6.145 and others. CVE-2026-72057 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-72057?

CVE-2026-72057 has a CVSS score of 8.2 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.

Is there a patch available for CVE-2026-72057?

Yes, CVE-2026-72057 has been patched. Fixed versions include 5.15.217, 6.1.184, 6.6.145 and others. If you are running Linux kernel 5.15.13 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-72057 actively exploited?

CVE-2026-72057 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-72057

High

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: preserve tc_skb_cb across defragmentation tcf_ct_handle_fragments() calls nf_ct_handle_fragments() without saving and restoring skb->cb. The defrag helper clears IPCB/IP6CB, which aliases the tc_skb_cb/qdisc_skb_cb control buffer. Fragmented traffic through act_ct therefore loses qdisc metadata such as pkt_segs and can trigger WARN_ON_ONCE() in qdisc_pkt_segs() when panic_on_warn is enabled. Save and restore the full tc_skb_cb around nf_ct_handle_fragments(), matching the pattern used by ovs_ct_handle_fragments().

Package Linux Kernel

Published 2026-08-15

Last modified 2026-08-23

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.2

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected versions

Linux kernel versions 5.15.13, 5.16 and later are affected. Fixed in 5.15.217, 6.1.184, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2 and their respective stable series.

Affected from

≥ 5.15.13 ≥ 5.16

Fixed in

✓ 5.15.217 5.15.x ✓ 6.1.184 6.1.x ✓ 6.6.145 6.6.x ✓ 6.12.97 6.12.x ✓ 6.18.40 6.18.x ✓ 7.1.5 7.1.x ✓ 7.2

References

7 total

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2026-72057

Severity High

CVSS score 8.2 / 10

CVSS version 3.1

Published 2026-08-15

Modified 2026-08-23

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-72057?

CVE-2026-72057 is a High severity Linux kernel vulnerability with a CVSS score of 8.2 out of 10 . It affects Linux kernel versions from 5.15.13 onward and has been patched in 5.15.217, 6.1.184, 6.6.145 and others. CVE-2026-72057 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-72057?

CVE-2026-72057 has a CVSS score of 8.2 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
Is there a patch available for CVE-2026-72057?

Yes. CVE-2026-72057 has been patched. Fixed versions include 5.15.217, 6.1.184, 6.6.145 and others. If you are running Linux kernel 5.15.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-72057 actively exploited?

No. CVE-2026-72057 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.