#VU98956 NULL pointer dereference in Linux kernel - CVE-2024-49940

Vulnerability identifier: #VU98956

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-2024-49940

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 pppol2tp_session_setsockopt() function in net/l2tp/l2tp_ppp.c, within the l2tp_nl_cmd_session_modify() function in net/l2tp/l2tp_netlink.c, within the l2tp_v3_session_get(), l2tp_session_register(), l2tp_recv_common(), EXPORT_SYMBOL_GPL(), l2tp_session_set_header_len() and l2tp_session_create() functions in net/l2tp/l2tp_core.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/f7415e60c25a6108cd7955a20b2e66b6251ffe02
https://git.kernel.org/stable/c/24256415d18695b46da06c93135f5b51c548b950

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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.