#VU94218 Use-after-free in Linux kernel - CVE-2024-40947

Vulnerability identifier: #VU94218

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-40947

CWE-ID: CWE-416

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 escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the smack_post_notification() function in security/smack/smack_lsm.c, within the selinux_audit_rule_free() and selinux_audit_rule_init() functions in security/selinux/ss/services.c, within the security_key_getsecurity() function in security/security.c, within the ima_free_rule(), ima_lsm_copy_rule(), ima_lsm_update_rule() and ima_lsm_rule_init() functions in security/integrity/ima/ima_policy.c, within the aa_audit_rule_free() and aa_audit_rule_init() functions in security/apparmor/audit.c, within the audit_data_to_entry() and audit_dupe_lsm_field() functions in kernel/auditfilter.c. A local user can escalate privileges on the system.

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/9c3906c3738562b1fedc6f1cfc81756a7cfefff0
https://git.kernel.org/stable/c/28d0ecc52f6c927d0e9ba70a4f2c1ea15453ee88
https://git.kernel.org/stable/c/58275455893066149e9f4df2223ab2fdbdc59f9c
https://git.kernel.org/stable/c/9a95c5bfbf02a0a7f5983280fe284a0ff0836c34

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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.