Description

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

nilfs2: fix OOB in nilfs_set_de_type

The size of the nilfs_type_by_mode array in the fs/nilfs2/dir.c file is
defined as "S_IFMT >> S_SHIFT", but the nilfs_set_de_type() function,
which uses this array, specifies the index to read from the array in the
same way as "(mode & S_IFMT) >> S_SHIFT".

static void nilfs_set_de_type(struct nilfs_dir_entry *de, struct inode
*inode)
{
umode_t mode = inode->i_mode;

de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; // oob
}

However, when the index is determined this way, an out-of-bounds (OOB)
error occurs by referring to an index that is 1 larger than the array size
when the condition "mode & S_IFMT == S_IFMT" is satisfied. Therefore, a
patch to resize the nilfs_type_by_mode array should be applied to prevent
OOB errors.

Classification

CVE ID: CVE-2024-26981

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 5.08% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/054f29e9ca05be3906544c5f2a2c7321c30a4243
https://git.kernel.org/stable/c/90f43980ea6be4ad903e389be9a27a2a0018f1c8
https://git.kernel.org/stable/c/7061c7efbb9e8f11ce92d6b4646405ea2b0b4de1
https://git.kernel.org/stable/c/bdbe483da21f852c93b22557b146bc4d989260f0
https://git.kernel.org/stable/c/897ac5306bbeb83e90c437326f7044c79a17c611
https://git.kernel.org/stable/c/2382eae66b196c31893984a538908c3eb7506ff9
https://git.kernel.org/stable/c/90823f8d9ecca3d5fa6b102c8e464c62f416975f
https://git.kernel.org/stable/c/c4a7dc9523b59b3e73fd522c73e95e072f876b16

Timeline