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CVE-2024-39463

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: 9p: add missing locking around taking dentry fid list Fix a use-after-free on dentry's d_fsdata fid list when a thread looks up…

Published Jun 25, 2024CWE-416EPSS 0.25%

Overview

CVE-2024-39463 is a high-severity vulnerability. It was published on June 25, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

9p: add missing locking around taking dentry fid list

Fix a use-after-free on dentry's d_fsdata fid list when a thread

looks up a fid through dentry while another thread unlinks it:

UAF thread:

refcount_t: addition on 0; use-after-free.

p9_fid_get linux/./include/net/9p/client.h:262

v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129

v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181

v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314

v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400

vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248

Freed by:

p9_fid_destroy (inlined)

p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456

p9_fid_put linux/./include/net/9p/client.h:278

v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55

v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518

vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335

The problem is that d_fsdata was not accessed under d_lock, because

d_release() normally

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfbRefgit.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409Refgit.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456Refgit.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5Refgit.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4Refwww.zerodayinitiative.com/advisories/ZDI-24-1194/Refgit.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409Refgit.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456Refgit.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5Refgit.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4

How CyberStrike helps

Frequently asked questions

What is CVE-2024-39463?

CVE-2024-39463 is a high-severity vulnerability. It was published on June 25, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-39463?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-39463?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-39463?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-39463 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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