CVE-2024-49900: jfs: Fix uninit-value access of new_ea in ea_buffer
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: jfs: Fix uninit-value access of new_ea in ea_buffer syzbot reports that lzo1x_1_do_compress is using uninit-value: ===================================================== BUG: KMSAN: uninit-value in lzo1x_1_do_compress+0x19f9/0x2510 lib/lzo/lzo1x_compress.c:178 ... Uninit was stored to memory at: ea_put fs/jfs/xattr.c:639 [inline] ... Local variable ea_buf created at: __jfs_setxattr+0x5d/0x1ae0 fs/jfs/xattr.c:662 __jfs_xattr_set+0xe6/0x1f0 fs/jfs/xattr.c:934 ===================================================== The reason is ea_buf->new_ea is not initialized properly. Fix this by using memset to empty its content at the beginning in ea_get().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | <5.10.227 | |
| Linux kernel | >=5.11<5.15.168 | |
| Linux kernel | >=5.16<6.1.113 | |
| Linux kernel | >=6.2<6.6.55 | |
| Linux kernel | >=6.7<6.10.14 | |
| Linux kernel | >=6.11<6.11.3 | |
| Linux Kernel | <5.10.227 | |
| Linux Kernel | >=5.11<5.15.168 | |
| Linux Kernel | >=5.16<6.1.113 | |
| Linux Kernel | >=6.2<6.6.55 | |
| Linux Kernel | >=6.7<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.135-1 6.12.25-1 6.12.27-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/2b59ffad47db1c46af25ccad157bb3b25147c35c
- https://git.kernel.org/stable/c/6041536d18c5f51a84bc37cd568cbab61870031e
- https://git.kernel.org/stable/c/7b24d41d47a6805c45378debf8bd115675d41da8
- https://git.kernel.org/stable/c/7c244d5b48284a770d96ff703df2dfeadf804a73
- https://git.kernel.org/stable/c/8ad8b531de79c348bcb8133e7f5e827b884226af
- https://git.kernel.org/stable/c/8b1dcf25c26d42e4a68c4725ce52a0543c7878cc
- https://git.kernel.org/stable/c/c076b3746224982eebdba5c9e4b1467e146c0d64
- https://git.kernel.org/stable/c/d7444f91a9f93eaa48827087ed0f3381c194181d
- https://git.kernel.org/stable/c/dac398ed272a378d2f42ac68ae408333a51baf52
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49900
- https://nvd.nist.gov/vuln/detail/CVE-2024-49900
- https://launchpad.net/bugs/cve/CVE-2024-49900
- https://security-tracker.debian.org/tracker/CVE-2024-49900
- https://ubuntu.com/security/CVE-2024-49900
- https://git.kernel.org/linus/2b59ffad47db1c46af25ccad157bb3b25147c35c
Frequently Asked Questions
What is the severity of CVE-2024-49900?
CVE-2024-49900 is considered a moderate severity vulnerability affecting certain versions of the Linux kernel.
How do I fix CVE-2024-49900?
To fix CVE-2024-49900, upgrade your Linux kernel to a version that is not affected, such as 6.1.123-1 or newer.
Which versions of the Linux kernel are affected by CVE-2024-49900?
CVE-2024-49900 affects Linux kernel versions from 5.11 to 6.11.3, excluding patched releases.
Is CVE-2024-49900 being actively exploited?
There is currently no public evidence that CVE-2024-49900 is being actively exploited in the wild.
What components in the Linux kernel are affected by CVE-2024-49900?
CVE-2024-49900 affects the jfs (Journaling File System) component related to uninitialized value access.
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