PT-2025-49656 · Linux+1 · Linux Kernel+1

Published 2025-12-09 · Updated 2025-12-10 · CVE-2023-53796

Positive Technologies (AI Summary)

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

Description A flaw exists in the Linux kernel’s f2fs file system related to information disclosure. Specifically, when converting an inline directory to a regular directory, the f2fs move inline dirents() function leaks uninitialized memory to disk because the entire directory block is not initialized. This issue was introduced by a commit that did not account for the security implications of leaking uninitialized memory. The problem was identified through testing with xfstest generic/435 on a KMSAN-enabled kernel.

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

Exploit

Related Identifiers

CVE-2023-53796

Affected Products

Linux Kernel

F2Fs

References · 21

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53796.json · Exploit
• https://ubuntu.com/security/CVE-2023-53796 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-53796 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2023-53796 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-53796 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-53796 · Security Note
• https://cve.org/CVERecord?id=CVE-2023-53796 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53796 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53796 · Vendor Advisory
• https://git.kernel.org/stable/c/9a5571cff4ffcfc24847df9fd545cc5799ac0ee5 · Note
• https://git.kernel.org/stable/c/117d4f6687b1f74423b5d398ea95c63b262a8e73 · Note
• https://docs.bell-sw.com/security/cves/CVE-2023-53796 · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://git.kernel.org/stable/c/f07a8d61b6ea81bb3cbe0638af40f8824d6147fd · Note
• https://git.kernel.org/stable/c/00b5587326625d0fddb2a5f5a3d4acd950102ace · Note