PT-2024-11296 · Linux+2 · Linux Kernel+2

Syzbot · Published 2021-07-18 · Updated 2025-12-06 · CVE-2021-47295

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

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

Description A memory leak was reported in the Linux kernel, specifically in the tcindex set parms() function. The issue arises from a non-freed perfect hash in tcindex partial destroy work(). When tcindex set parms() allocates new tcindex data and copies fields from the old one, it fails to copy the perfect hash, leading to a memory leak. This leak occurs because tcindex partial destroy work() is the destroy function for the old tcindex data, and it needs to free the perfect hash to prevent the leak.

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

Resource Exhaustion

Weakness Enumeration

CWE-400

CWE-402

Related Identifiers

BDU:2025-07332

CVE-2021-47295

SUSE-SU-2024:2892-1

SUSE-SU-2024:2901-1

SUSE-SU-2024:2940-1

Affected Products

Astra Linux

Linux Kernel

Suse

References · 397

• https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865b · Patch
• https://security-tracker.debian.org/tracker/CVE-2021-47295 · Vendor Advisory
• https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62 · Patch
• https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1 · Patch
• https://osv.dev/vulnerability/CVE-2021-47295 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2892-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2940-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47295 · Security Note
• https://bdu.fstec.ru/vul/2025-07332 · Security Note
• https://ubuntu.com/security/CVE-2021-47295 · Vendor Advisory
• https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2901-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47295 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47295 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-47295 · Security Note