SB2024070182 - Resource management error in Linux kernel x86 entry

Description

This security bulletin contains information about 1 vulnerability.

1) Resource management error (CVE-ID: CVE-2021-4440)

CWE-ID: CWE-399 - Resource Management Errors

CVSSv4: 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

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to resource management error within the SYM_CODE_START() function in arch/x86/xen/xen-asm.S, within the native_patch() function in arch/x86/kernel/paravirt_patch.c, within the paravirt_patch_default() and native_steal_clock() functions in arch/x86/kernel/paravirt.c, within the main() function in arch/x86/kernel/asm-offsets_64.c, within the SYM_INNER_LABEL() and SYM_CODE_END() functions in arch/x86/entry/entry_64.S. A local user can perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1424ab4bb386df9cc590c73afa55f13e9b00dea2
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.218