What is CVE-2026-52937?

CVE-2026-52937 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 5.4.103 onward and patched in 6.18.34, 7.0.11 and 7.1. CVE-2026-52937 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-52937?

CVE-2026-52937 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-52937?

Yes, CVE-2026-52937 has been patched. Fixed versions include 6.18.34, 7.0.11 and 7.1. If you are running Linux kernel 5.4.103 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-52937 actively exploited?

CVE-2026-52937 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-52937

In the Linux kernel, the following vulnerability has been resolved: tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR In the SIOCGIFHWADDR path, tap_ioctl() copies 16 bytes of an uninitialised on-stack struct sockaddr_storage to userspace via ifr_hwaddr, but netif_get_mac_address() only writes sa_family and dev->addr_len (6 for Ethernet) bytes, leaving sa_data[6..13] uninitialised. Those 8 trailing bytes leak kernel stack contents; SIOCGIFHWADDR on a macvtap chardev returns kernel .text and direct-map pointers, defeating KASLR. Initialise ss at declaration.

Package Linux Kernel

Published 2026-06-24

Last modified 2026-06-24

Patch available

Yes

Affected versions

Linux kernel versions 5.4.103, 5.10.21, 5.11.4, 5.12 and later are affected. Fixed in 6.18.34, 7.0.11, 7.1 and their respective stable series.

Affected from

≥ 5.4.103 ≥ 5.10.21 ≥ 5.11.4 ≥ 5.12

Fixed in

✓ 6.18.34 6.18.x ✓ 7.0.11 7.0.x ✓ 7.1

References

3 total

Frequently asked questions

What is CVE-2026-52937?

CVE-2026-52937 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.4.103 onward and has been patched in 6.18.34, 7.0.11 and 7.1. CVE-2026-52937 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-52937?

Yes — CVE-2026-52937 has been patched. Fixed versions include 6.18.34, 7.0.11 and 7.1. If you are running Linux kernel 5.4.103 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-52937 actively exploited?

No — CVE-2026-52937 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.