CVE-2026-52971

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-52971

Key Details

CVE	CVE-2026-52971
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-416 (Use After Free)

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

net: ena: PHC: Fix potential use-after-free in get_timestamp

Move the phc->active check and resp pointer assignment to after

acquiring the spinlock. Previously, phc->active was checked without

holding the lock, and resp was cached from ena_dev->phc.virt_addr

before the lock was acquired.

If ena_com_phc_destroy() runs between the lockless active check and

the lock acquisition, it sets active=false, releases the lock, frees

the DMA memory, and sets virt_addr=NULL. The get_timestamp path would

then read a NULL virt_addr and dereference it.

With both the active check and the pointer read under the lock,

destroy cannot free the memory while get_timestamp is using it. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-52971
CVE	https://www.cve.org/CVERecord?id=CVE-2026-52971

Source

Reference

NVD

CVE