What is CVE-2026-53363?

CVE-2026-53363 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.14 onward and patched in 6.18.36, 7.0.13 and 7.1. CVE-2026-53363 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-53363?

CVE-2026-53363 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-53363?

Yes, CVE-2026-53363 has been patched. Fixed versions include 6.18.36, 7.0.13 and 7.1. If you are running Linux kernel 6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-53363 actively exploited?

CVE-2026-53363 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-53363

In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags() iptfs_consume_frags() transfers paged fragments from one socket buffer to another but fails to propagate the SKBFL_SHARED_FRAG flag. This is the same class of bug that was fixed in skb_try_coalesce() for CVE-2026-46300: when fragments backed by read-only page-cache pages are merged, the marker indicating their shared nature must be preserved so that ESP can decide correctly whether in-place encryption is safe. Apply the same two-line fix used in skb_try_coalesce() to iptfs_consume_frags().

Package Linux Kernel

Published 2026-07-10

Last modified 2026-07-10

Patch available

Yes

Affected versions

Linux kernel versions 6.14 and later are affected. Fixed in 6.18.36, 7.0.13, 7.1 and their respective stable series.

Affected from

≥ 6.14

Fixed in

✓ 6.18.36 6.18.x ✓ 7.0.13 7.0.x ✓ 7.1

References

3 total

Frequently asked questions

What is CVE-2026-53363?

CVE-2026-53363 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.14 onward and has been patched in 6.18.36, 7.0.13 and 7.1. CVE-2026-53363 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-53363?

Yes — CVE-2026-53363 has been patched. Fixed versions include 6.18.36, 7.0.13 and 7.1. If you are running Linux kernel 6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-53363 actively exploited?

No — CVE-2026-53363 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.