# CVE-2023-52779: linux: In the Linux kernel, the following vulnerability has been resolved:  fs: Pass AT_GETATTR_NOSEC flag to getattr interf...

CVE-2023-52779 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52779, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52779
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.6.8-1 | [DEBIAN-CVE-2023-52779](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52779.md) | May 21, 2024 |
| Linux | linux Debian 14 | 6.6.8-1 | [DEBIAN-CVE-2023-52779](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52779.md) | May 21, 2024 |

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