CVE-2024-49900 Information

Description

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().

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Reference

https://git.kernel.org/stable/c/8b1dcf25c26d42e4a68c4725ce52a0543c7878cc https://git.kernel.org/stable/c/d7444f91a9f93eaa48827087ed0f3381c194181d https://git.kernel.org/stable/c/6041536d18c5f51a84bc37cd568cbab61870031e https://git.kernel.org/stable/c/c076b3746224982eebdba5c9e4b1467e146c0d64 https://git.kernel.org/stable/c/7c244d5b48284a770d96ff703df2dfeadf804a73 https://git.kernel.org/stable/c/8ad8b531de79c348bcb8133e7f5e827b884226af https://git.kernel.org/stable/c/2b59ffad47db1c46af25ccad157bb3b25147c35c

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.1