#VU102151 NULL pointer dereference in Linux kernel - CVE-2024-56549

Vulnerability identifier: #VU102151

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-2024-56549

CWE-ID: CWE-476

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 NULL pointer dereference within the cachefiles_ondemand_fd_write_iter() and cachefiles_ondemand_fd_llseek() functions in fs/cachefiles/ondemand.c, within the cachefiles_commit_object() and cachefiles_clean_up_object() functions in fs/cachefiles/interface.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

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External links
https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1
https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418
https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293

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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.