{"api_version":"1","generated_at":"2026-11-01T19:08:46+00:00","cve":"CVE-2023-54232","urls":{"html":"https://cve.report/CVE-2023-54232","api":"https://cve.report/api/cve/CVE-2023-54232.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-54232","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-54232"},"summary":{"title":"m68k: Only force 030 bus error if PC not in exception table","description":"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't 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-12-30 13:16:11","updated_at":"2026-10-28 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54232","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f2325ecebc5b7988fd49968bd3a660fd1594dc84 1a6059f5ed57f48edfe7159404ff7d538d9d405b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f2325ecebc5b7988fd49968bd3a660fd1594dc84 f55cb52ec98b22125f5bda36391edb8894f7e8cf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f2325ecebc5b7988fd49968bd3a660fd1594dc84 2100e374251a8fc00cce1916cfc50f3cb652cbe3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f2325ecebc5b7988fd49968bd3a660fd1594dc84 df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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't 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."}],"providerMetadata":{"dateUpdated":"2026-05-11T19:58:00.368Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1a6059f5ed57f48edfe7159404ff7d538d9d405b"},{"url":"https://git.kernel.org/stable/c/f55cb52ec98b22125f5bda36391edb8894f7e8cf"},{"url":"https://git.kernel.org/stable/c/2100e374251a8fc00cce1916cfc50f3cb652cbe3"},{"url":"https://git.kernel.org/stable/c/df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8"},{"url":"https://git.kernel.org/stable/c/8bf8d5dade4c5e1d8a2386f29253ed28b5d87735"},{"url":"https://git.kernel.org/stable/c/54fa25ffab2b700df5abd58c136d64a912c53953"},{"url":"https://git.kernel.org/stable/c/ec15405b80fc15ffc87a23d01378ae061c1aba07"},{"url":"https://git.kernel.org/stable/c/e36a82bebbf7da814530d5a179bef9df5934b717"}],"title":"m68k: Only force 030 bus error if PC not in exception table","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","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","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-30 13:16:11","lastModifiedDate":"2026-10-28 19:10:00","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2023","CveId":"54232","Ordinal":"1","Title":"m68k: Only force 030 bus error if PC not in exception table","CVE":"CVE-2023-54232","Year":"2023"},"notes":[{"CveYear":"2023","CveId":"54232","Ordinal":"1","NoteData":"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't 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.","Type":"Description","Title":"m68k: Only force 030 bus error if PC not in exception table"}]}}}