CVE-2023-54232 (GCVE-0-2023-54232)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-05-11 19:58
VLAI
Title
m68k: Only force 030 bus error if PC not in exception table
Summary
In the Linux kernel, the following vulnerability has been resolved: m68k: Only force 030 bus error if PC not in exception table __get_kernel_nofault() does copy data in supervisor mode when forcing a task backtrace log through /proc/sysrq_trigger. This is expected cause a bus error exception on e.g. NULL pointer dereferencing when logging a kernel task has no workqueue associated. This bus error ought to be ignored. Our 030 bus error handler is ill equipped to deal with this: Whenever ssw indicates a kernel mode access on a data fault, we don't even attempt to handle the fault and instead always send a SEGV signal (or panic). As a result, the check for exception handling at the fault PC (buried in send_sig_fault() which gets called from do_page_fault() eventually) is never used. In contrast, both 040 and 060 access error handlers do not care whether a fault happened on supervisor mode access, and will call do_page_fault() on those, ultimately honoring the exception table. Add a check in bus_error030 to call do_page_fault() in case we do have an entry for the fault PC in our exception table. I had attempted a fix for this earlier in 2019 that did rely on testing pagefault_disabled() (see link below) to achieve the same thing, but this patch should be more generic. Tested on 030 Atari Falcon.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f2325ecebc5b7988fd49968bd3a660fd1594dc84 , < 1a6059f5ed57f48edfe7159404ff7d538d9d405b (git)
Affected: f2325ecebc5b7988fd49968bd3a660fd1594dc84 , < f55cb52ec98b22125f5bda36391edb8894f7e8cf (git)
Affected: f2325ecebc5b7988fd49968bd3a660fd1594dc84 , < 2100e374251a8fc00cce1916cfc50f3cb652cbe3 (git)
Affected: f2325ecebc5b7988fd49968bd3a660fd1594dc84 , < df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8 (git)
Affected: f2325ecebc5b7988fd49968bd3a660fd1594dc84 , < 8bf8d5dade4c5e1d8a2386f29253ed28b5d87735 (git)
Affected: f2325ecebc5b7988fd49968bd3a660fd1594dc84 , < 54fa25ffab2b700df5abd58c136d64a912c53953 (git)
Affected: f2325ecebc5b7988fd49968bd3a660fd1594dc84 , < ec15405b80fc15ffc87a23d01378ae061c1aba07 (git)
Affected: f2325ecebc5b7988fd49968bd3a660fd1594dc84 , < e36a82bebbf7da814530d5a179bef9df5934b717 (git)
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Linux Linux Affected: 2.6.18
Unaffected: 0 , < 2.6.18 (semver)
Unaffected: 4.14.312 , ≤ 4.14.* (semver)
Unaffected: 4.19.280 , ≤ 4.19.* (semver)
Unaffected: 5.4.240 , ≤ 5.4.* (semver)
Unaffected: 5.10.177 , ≤ 5.10.* (semver)
Unaffected: 5.15.105 , ≤ 5.15.* (semver)
Unaffected: 6.1.22 , ≤ 6.1.* (semver)
Unaffected: 6.2.9 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nm68k: Only force 030 bus error if PC not in exception table\n\n__get_kernel_nofault() does copy data in supervisor mode when\nforcing a task backtrace log through /proc/sysrq_trigger.\nThis is expected cause a bus error exception on e.g. NULL\npointer dereferencing when logging a kernel task has no\nworkqueue associated. This bus error ought to be ignored.\n\nOur 030 bus error handler is ill equipped to deal with this:\n\nWhenever ssw indicates a kernel mode access on a data fault,\nwe don\u0027t even attempt to handle the fault and instead always\nsend a SEGV signal (or panic). As a result, the check\nfor exception handling at the fault PC (buried in\nsend_sig_fault() which gets called from do_page_fault()\neventually) is never used.\n\nIn contrast, both 040 and 060 access error handlers do not\ncare whether a fault happened on supervisor mode access,\nand will call do_page_fault() on those, ultimately honoring\nthe exception table.\n\nAdd a check in bus_error030 to call do_page_fault() in case\nwe do have an entry for the fault PC in our exception table.\n\nI had attempted a fix for this earlier in 2019 that did rely\non testing pagefault_disabled() (see link below) to achieve\nthe same thing, but this patch should be more generic.\n\nTested on 030 Atari Falcon."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2023-54232",
    "datePublished": "2025-12-30T12:11:23.565Z",
    "dateReserved": "2025-12-30T12:06:44.502Z",
    "dateUpdated": "2026-05-11T19:58:00.368Z",
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As a result, the check\\nfor exception handling at the fault PC (buried in\\nsend_sig_fault() which gets called from do_page_fault()\\neventually) is never used.\\n\\nIn contrast, both 040 and 060 access error handlers do not\\ncare whether a fault happened on supervisor mode access,\\nand will call do_page_fault() on those, ultimately honoring\\nthe exception table.\\n\\nAdd a check in bus_error030 to call do_page_fault() in case\\nwe do have an entry for the fault PC in our exception table.\\n\\nI had attempted a fix for this earlier in 2019 that did rely\\non testing pagefault_disabled() (see link below) to achieve\\nthe same thing, but this patch should be more generic.\\n\\nTested on 030 Atari Falcon.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/m68k/kernel/traps.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f2325ecebc5b7988fd49968bd3a660fd1594dc84\",\"lessThan\":\"1a6059f5ed57f48edfe7159404ff7d538d9d405b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2325ecebc5b7988fd49968bd3a660fd1594dc84\",\"lessThan\":\"f55cb52ec98b22125f5bda36391edb8894f7e8cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2325ecebc5b7988fd49968bd3a660fd1594dc84\",\"lessThan\":\"2100e374251a8fc00cce1916cfc50f3cb652cbe3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2325ecebc5b7988fd49968bd3a660fd1594dc84\",\"lessThan\":\"df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2325ecebc5b7988fd49968bd3a660fd1594dc84\",\"lessThan\":\"8bf8d5dade4c5e1d8a2386f29253ed28b5d87735\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2325ecebc5b7988fd49968bd3a660fd1594dc84\",\"lessThan\":\"54fa25ffab2b700df5abd58c136d64a912c53953\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2325ecebc5b7988fd49968bd3a660fd1594dc84\",\"lessThan\":\"ec15405b80fc15ffc87a23d01378ae061c1aba07\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2325ecebc5b7988fd49968bd3a660fd1594dc84\",\"lessThan\":\"e36a82bebbf7da814530d5a179bef9df5934b717\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/m68k/kernel/traps.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.312\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.280\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.240\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.177\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.105\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.22\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.9\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a6059f5ed57f48edfe7159404ff7d538d9d405b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2100e374251a8fc00cce1916cfc50f3cb652cbe3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54fa25ffab2b700df5abd58c136d64a912c53953\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8bf8d5dade4c5e1d8a2386f29253ed28b5d87735\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e36a82bebbf7da814530d5a179bef9df5934b717\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec15405b80fc15ffc87a23d01378ae061c1aba07\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f55cb52ec98b22125f5bda36391edb8894f7e8cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:24:36+00:00",
      "cve": "CVE-2023-54232",
      "id": "CVE-2023-54232",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: m68k: Only force 030 bus error if PC not in exception table",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54232.json",
      "version": "3"
    }
  }
}



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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.
  • 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.