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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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-03-05 22:11 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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. 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      "current_release_date": "2025-11-21T11:51:27+00:00",
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      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: x86/alternatives: Disable KASAN in apply_alternatives()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-52504.json",
      "version": "3"
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      "current_release_date": "2026-08-23T16:50:52Z",
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      "initial_release_date": "2024-03-19T03:37:57Z",
      "product_status:known_affected": "315",
      "product_status:known_not_affected": "189",
      "product_status:recommended": "702",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-52504",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-52504.json",
      "version": "61"
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\"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.5.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/x86/kernel/alternative.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3719d3c36aa853d5a2401af9f8d6b116c91ad5ae\"}, {\"url\": \"https://git.kernel.org/stable/c/3770c38cd6a60494da29ac2da73ff8156440a2d1\"}, {\"url\": \"https://git.kernel.org/stable/c/6788b10620ca6e98575d1e06e72a8974aad7657e\"}, {\"url\": \"https://git.kernel.org/stable/c/ecba5afe86f30605eb9dfb7f265a8de0218d4cfc\"}, {\"url\": \"https://git.kernel.org/stable/c/5b784489c8158518bf7a466bb3cc045b0fb66b4b\"}, {\"url\": \"https://git.kernel.org/stable/c/cd287cc208dfe6bd6da98e7f88e723209242c9b4\"}, {\"url\": \"https://git.kernel.org/stable/c/d35652a5fc9944784f6f50a5c979518ff8dacf61\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nx86/alternatives: Disable KASAN in apply_alternatives()\\n\\nFei has reported that KASAN triggers during apply_alternatives() on\\na 5-level paging machine:\\n\\n\\tBUG: KASAN: out-of-bounds in rcu_is_watching()\\n\\tRead of size 4 at addr ff110003ee6419a0 by task swapper/0/0\\n\\t...\\n\\t__asan_load4()\\n\\trcu_is_watching()\\n\\ttrace_hardirqs_on()\\n\\ttext_poke_early()\\n\\tapply_alternatives()\\n\\t...\\n\\nOn machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57)\\ngets patched. 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 ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.297\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.270\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.199\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.136\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.59\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5.8\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6\", \"versionStartIncluding\": \"4.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T19:28:35.856Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52504\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T19:28:35.856Z\", \"dateReserved\": \"2024-02-20T12:30:33.314Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-02T21:52:18.500Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.