PT-2025-49479 · Linux · Linux Kernel

Published 2025-12-08 · Updated 2025-12-09 · CVE-2023-53749

Positive Technologies (AI Summary)

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

Description The Linux kernel contained an incorrect exception table annotation in the clear user rep good() function. This could lead to a kernel oops report being generated instead of a -EFAULT return when a user access exception occurred. The issue stemmed from the exception handler not correctly identifying the instruction causing the fault. The code responsible for this issue has been removed in upstream commits, but the annotation error persisted. The root cause was an incorrect placement of the exception table annotation for the final 'rep movsb' instruction within the function. This could be mistaken for a filesystem bug.

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

Exploit

Related Identifiers

CVE-2023-53749

Affected Products

Linux Kernel

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53749.json · Exploit
• https://ubuntu.com/security/CVE-2023-53749 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53749 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-53749 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-53749 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-53749 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53749 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-53749 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2023-53749 · Vendor Advisory
• https://docs.bell-sw.com/security/cves/CVE-2023-53749 · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/CVEnew/status/1997863663428833418 · Twitter Post
• https://t.me/CVEtracker/39058 · Telegram Post
• https://git.kernel.org/stable/c/90510aed20a26e1a4dede4ef6b640e6a4122f38f · Note
• https://git.kernel.org/linus/d2c95f9d6802cc518d71d9795f4d9da54fb4e24d · Note