#VU102103 NULL pointer dereference in Linux kernel - CVE-2024-56702

Vulnerability identifier: #VU102103

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-2024-56702

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 SEC() function in tools/testing/selftests/bpf/progs/test_tp_btf_nullable.c, within the reg_btf_record(), check_ptr_to_btf_access(), check_mem_access(), check_func_arg(), btf_check_func_arg_match(), check_kfunc_args(), sanitize_check_bounds(), adjust_ptr_min_max_vals() and convert_ctx_accesses() functions in kernel/bpf/verifier.c, within the btf_ctx_access() function in kernel/bpf/btf.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/3634d4a310820567fc634bf8f1ee2b91378773e8
https://git.kernel.org/stable/c/c9b91d2d54175f781ad2c361cb2ac2c0e29b14b6
https://git.kernel.org/stable/c/cb4158ce8ec8a5bb528cc1693356a5eb8058094d

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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.