Oracle Linux: CVE-2024-42161: ELSA-2024-12618: Unbreakable Enterprise kernel security update (IMPORTANT) (Multiple Advisories)

Oracle Linux: CVE-2024-42161: ELSA-2024-12618: Unbreakable Enterprise kernel security update (IMPORTANT) (Multiple Advisories)

Severity

6

CVSS

(AV:L/AC:L/Au:M/C:P/I:C/A:C)

Published

07/30/2024

Created

11/13/2024

Added

10/16/2024

Modified

01/23/2025

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD [Changes from V1: - Use a default branch in the switch statement to initialize `val'.] GCC warns that `val' may be used uninitialized in the BPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as: [...] unsigned long long val;\ [...]\ switch (__CORE_RELO(s, field, BYTE_SIZE)) {\ case 1: val = *(const unsigned char *)p; break;\ case 2: val = *(const unsigned short *)p; break;\ case 4: val = *(const unsigned int *)p; break;\ case 8: val = *(const unsigned long long *)p; break;\ } \ [...] val;\ }\ This patch adds a default entry in the switch statement that sets `val' to zero in order to avoid the warning, and random values to be used in case __builtin_preserve_field_info returns unexpected values for BPF_FIELD_BYTE_SIZE. Tested in bpf-next master. No regressions. A vulnerability was found in the Linux kernel in the bpf_enum_value_kind() function, where a lack of proper checks could lead to an uninitialized variable being used. This issue could lead to undefined behavior or memory corruption.

Solution(s)

• oracle-linux-upgrade-kernel-uek

References

• https://attackerkb.com/topics/cve-2024-42161
• CVE - 2024-42161
• ELSA-2024-12618