PT-2024-11158 · Linux · Linux Kernel

Published 2021-05-08 · Updated 2024-12-09 · CVE-2021-47081

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A potential use after free issue has been identified in the Linux kernel, specifically in the gaudi memset device memory function. The issue arises when hl cs allocate job() fails, causing the execution to branch into release cb, where one reference of cb is dropped by hl cb put(cb). If another thread also drops a reference, cb could be freed, and its subsequent use by cb->id would be a potential use after free. The code analyzer reported this issue as a use after free (uaf).

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2025-05316

CVE-2021-47081

Affected Products

Linux Kernel

References · 13

• https://bdu.fstec.ru/vul/2025-05316 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47081 · Vendor Advisory
• https://git.kernel.org/stable/c/b49f5af30b0e4064fbd91e83823a4bfcb2c7a3e7 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47081 · Security Note
• https://git.kernel.org/stable/c/115726c5d312b462c9d9931ea42becdfa838a076 · Patch
• https://cve.org/CVERecord?id=CVE-2021-47081 · Security Note
• https://ubuntu.com/security/CVE-2021-47081 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47081 · Vendor Advisory
• https://lore.kernel.org/linux-cve-announce/2024030143-CVE-2021-47081-e590@gregkh/T/#u · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.7 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47081 · Note
• https://lore.kernel.org/linux-cve-announce/2024030143-CVE-2021-47081-e590@gregkh · Note
• https://git.kernel.org/linus/115726c5d312b462c9d9931ea42becdfa838a076 · Note