In the Linux kernel, the following vulnerability has been resolved:
fs: Pass AT_GETATTR_NOSEC flag to getattr interface function
When vfs_getattr_nosec() calls a filesystem's getattr interface function
then the 'nosec' should propagate into this function so that
vfs_getattr_nosec() can again be called from the filesystem's gettattr
rather than vfs_getattr(). The latter would add unnecessary security
checks that the initial vfs_getattr_nosec() call wanted to avoid.
Therefore, introduce the getattr flag GETATTR_NOSEC and allow to pass
with the new getattr_flags parameter to the getattr interface function.
In overlayfs and ecryptfs use this flag to determine which one of the
two functions to call.
In a recent code change introduced to IMA vfs_getattr_nosec() ended up
calling vfs_getattr() in overlayfs, which in turn called
security_inode_getattr() on an exiting process that did not have
current->fs set anymore, which then caused a kernel NULL pointer
dereference. With this change the call to security_inode_getattr() can
be avoided, thus avoiding the NULL pointer dereference.
References
Configurations
Configuration 1 (hide)
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History
02 Apr 2025, 15:02
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-476 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.7:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.7:rc2:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4 - Patch | |
| References | () https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf - Patch |
Information
Published : 2024-05-21 16:15
Updated : 2025-04-02 15:02
NVD link : CVE-2023-52779
Mitre link : CVE-2023-52779
CVE.ORG link : CVE-2023-52779
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference