PT-2023-9437 · Linux+1 · Linux Kernel+1

Olivier Langlois · Published 2023-01-20 · Updated 2024-09-24 · CVE-2023-52895

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description The issue is related to a race condition in the io uring/poll component of the Linux kernel, specifically with multishot requests. A previous commit fixed a poll race that can occur, but it's only applicable for multishot requests. For a multishot request, it's safe to ignore a spurious wakeup, as the waitqueue is never left. A blunt reissue of a multishot armed request can cause a buffer leak if ring-provided buffers are used. It's not defined behavior to reissue a multishot request directly, and it's less efficient and not required to rearm anything like it is for singleshot poll requests. The vulnerability can be exploited to cause a denial of service.

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

Exploit

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

BDU:2024-07588

CVE-2023-52895

Affected Products

Linux Kernel

Red Os

References · 20

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52895.json · Exploit
• https://osv.dev/vulnerability/CVE-2023-52895 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-52895 · Security Note
• https://bdu.fstec.ru/vul/2024-07588 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-52895 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-52895 · Vendor Advisory
• https://git.kernel.org/stable/c/8caa03f10bf92cb8657408a6ece6a8a73f96ce13 · Patch
• https://git.kernel.org/stable/c/36fc7317cdb16cfeae0f879916995037bb615ac4 · Patch
• https://security-tracker.debian.org/tracker/CVE-2023-52895 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-52895 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-52895 · Vendor Advisory
• https://redos.red-soft.ru/support/secure · Note
• https://git.kernel.org/linus/8caa03f10bf92cb8657408a6ece6a8a73f96ce13 · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/CVEnew/status/1826142261840654773 · Twitter Post