#VU94237 Out-of-bounds read in Linux kernel - CVE-2024-40955

Vulnerability identifier: #VU94237

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-40955

CWE-ID: CWE-125

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to an out-of-bounds read error within the EXT4_ATTR_FUNC(), ext4_attr_show() and ext4_attr_store() functions in fs/ext4/sysfs.c, within the mb_avg_fragment_size_order() and ext4_mb_choose_next_group_best_avail() functions in fs/ext4/mballoc.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

---

External links
https://git.kernel.org/stable/c/677ff4589f1501578fa903a25bb14831d0607992
https://git.kernel.org/stable/c/b829687ae1229224262bcabf49accfa2dbf8db06
https://git.kernel.org/stable/c/13df4d44a3aaabe61cd01d277b6ee23ead2a5206

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.