Updated: 2024-12-12 00:02:11.035049
Description:
In the Linux kernel, the following vulnerability has been resolved: x86/alternatives: Disable KASAN in apply_alternatives() Fei has reported that KASAN triggers during apply_alternatives() on a 5-level paging machine: BUG: KASAN: out-of-bounds in rcu_is_watching() Read of size 4 at addr ff110003ee6419a0 by task swapper/0/0 ... __asan_load4() rcu_is_watching() trace_hardirqs_on() text_poke_early() apply_alternatives() ... On machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57) gets patched. It includes KASAN code, where KASAN_SHADOW_START depends on __VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled(). KASAN gets confused when apply_alternatives() patches the KASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START static, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue. Fix it for real by disabling KASAN while the kernel is patching alternatives. [ mingo: updated the changelog ]
Links | NIST | CIRCL | RHEL | Ubuntu |
Severity | Score | |
---|---|---|
CVSS Version 2.x | 0 | |
CVSS Version 3.x | HIGH | 7.1 |
OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
---|---|---|---|---|---|---|---|---|
AlmaLinux 9.2 ESU | kernel | 5.14.0 | 7.1 | HIGH | Released | CLSA-2025:1738671431 | 2025-02-05 02:21:28 | |
AlmaLinux 9.2 FIPS | kernel | 5.14.0 | 7.1 | HIGH | Released | CLSA-2025:1738670922 | 2025-02-05 02:21:29 | |
CentOS 8.4 ELS | kernel | 4.18.0 | 7.1 | HIGH | In Testing | CLSA-2025:1736778412 | 2025-02-01 23:55:01 | |
CentOS 8.5 ELS | kernel | 4.18.0 | 7.1 | HIGH | In Testing | CLSA-2025:1736778632 | 2025-02-11 00:36:51 | |
Ubuntu 16.04 ELS | linux | 4.4.0 | 7.1 | HIGH | Not Vulnerable | 2024-06-13 11:19:53 | ||
Ubuntu 18.04 ELS | linux | 4.15.0 | 7.1 | HIGH | Not Vulnerable | 2024-06-13 11:19:53 |