CVE-2023-52504 (GCVE-0-2023-52504)

Vulnerability from cvelistv5 – Published: 2024-03-02 21:52 – Updated: 2026-05-11 19:28
VLAI
Title
x86/alternatives: Disable KASAN in apply_alternatives()
Summary
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 ]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 , < 3719d3c36aa853d5a2401af9f8d6b116c91ad5ae (git)
Affected: 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 , < 3770c38cd6a60494da29ac2da73ff8156440a2d1 (git)
Affected: 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 , < 6788b10620ca6e98575d1e06e72a8974aad7657e (git)
Affected: 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 , < ecba5afe86f30605eb9dfb7f265a8de0218d4cfc (git)
Affected: 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 , < 5b784489c8158518bf7a466bb3cc045b0fb66b4b (git)
Affected: 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 , < cd287cc208dfe6bd6da98e7f88e723209242c9b4 (git)
Affected: 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 , < d35652a5fc9944784f6f50a5c979518ff8dacf61 (git)
Create a notification for this product.
Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 4.19.297 , ≤ 4.19.* (semver)
Unaffected: 5.4.270 , ≤ 5.4.* (semver)
Unaffected: 5.10.199 , ≤ 5.10.* (semver)
Unaffected: 5.15.136 , ≤ 5.15.* (semver)
Unaffected: 6.1.59 , ≤ 6.1.* (semver)
Unaffected: 6.5.8 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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It includes KASAN code, where KASAN_SHADOW_START depends on\\n__VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled().\\n\\nKASAN gets confused when apply_alternatives() patches the\\nKASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START\\nstatic, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue.\\n\\nFix it for real by disabling KASAN while the kernel is patching alternatives.\\n\\n[ mingo: updated the changelog ]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: x86/alternatives: deshabilite KASAN en apply_alternatives() Fei ha informado que KASAN se activa durante apply_alternatives() en una m\u00e1quina de paginaci\u00f3n de 5 niveles: ERROR: KASAN: fuera de los l\u00edmites en rcu_is_watching() Lectura de tama\u00f1o 4 en la direcci\u00f3n ff110003ee6419a0 mediante task swapper/0/0 ... __asan_load4() rcu_is_watching() trace_hardirqs_on() text_poke_early() apply_alternatives() ... En m\u00e1quinas con paginaci\u00f3n de 5 niveles, cpu_feature_enabled(X86_FEATURE_LA57) se parchea. Incluye c\u00f3digo KASAN, donde KASAN_SHADOW_START depende de __VIRTUAL_MASK_SHIFT, que se define con cpu_feature_enabled(). KASAN se confunde cuando apply_alternatives() parchea a los usuarios de KASAN_SHADOW_START. Un parche de prueba que hace que KASAN_SHADOW_START sea est\u00e1tico, reemplazando __VIRTUAL_MASK_SHIFT con 56, soluciona el problema. Solucionelo de verdad deshabilitando KASAN mientras el kernel parchea alternativas. [mingo: actualiz\u00f3 el registro de 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.