linux: In the Linux kernel, the following vulnerability has been resolved: x86/alternatives: Disable KASAN in apply_alterna...
CVE-2023-52504 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52504, released March 2, 2024. It is not reported as exploited. Patch Radar priority: High.
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 ]
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 6.1.64-1 | DEBIAN-CVE-2023-52504 | Mar 2, 2024 |
| linux · Debian 13.5 (trixie) | 6.5.8-1 | DEBIAN-CVE-2023-52504 | Mar 2, 2024 |
| linux · Debian 14 | 6.5.8-1 | DEBIAN-CVE-2023-52504 | Mar 2, 2024 |
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