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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2024-39276 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find() Syzbot reports a warning as follows: ============================================ WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Modules linked in: CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Call Trace: <TASK> ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] ============================================ This is because when finding an entry in ext4_xattr_block_cache_find(), if ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown in the __entry_find(), won't be put away, and eventually trigger the above issue in mb_cache_destroy() due to reference count leakage. So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e CVE, kernel.org Patch 
https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb CVE, kernel.org Patch 
https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9 CVE, kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-Other Other cwe source acceptance level NIST  

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-39276
NVD Published Date:
06/25/2024
NVD Last Modified:
03/24/2025
Source:
kernel.org