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A vulnerability in the Linux kernel's tap_ioctl() function related to the SIOCGIFHWADDR ioctl call was fixed. The flaw caused 8 bytes of uninitialized kernel stack memory to be leaked to userspace, potentially revealing kernel pointers and defeating Kernel Address Space Layout Randomization (KASLR). This issue affects certain versions of the linux-hwe-edge kernel prior to 7.0.0-28.28 and related versions. The vulnerability has a medium severity rating and a CVSS score of 5.5. A patch is available and included in updated Linux kernel packages. Users should update and reboot to apply the fix.

The Linux kernel vulnerability CVE-2026-52937 involves a stack information leak in the tap_ioctl() function's handling of the SIOCGIFHWADDR ioctl. Specifically, 16 bytes of an uninitialized on-stack struct sockaddr_storage are copied to userspace, but only part of this structure is properly initialized, leaving 8 trailing bytes uninitialized. These bytes leak kernel stack contents including kernel .text and direct-map pointers, which can defeat KASLR protections. The issue affects linux-hwe-edge kernel versions prior to 7.0.0-28.28 and related builds. The vulnerability has been addressed by initializing the struct at declaration. The fix is included in official Ubuntu kernel updates as detailed in Ubuntu Security Notices USN-8566-1 and USN-8568-1.

Detailed information about UBUNTU-CVE-2026-52937 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-52937 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR In the SIOCGIFHWADDR path,… (CVE-2026-52937)

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