{"id":"CVE-2023-54232","summary":"m68k: Only force 030 bus error if PC not in exception table","details":"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.","modified":"2026-04-02T09:45:41.965547Z","published":"2025-12-30T12:11:23.565Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54232.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1a6059f5ed57f48edfe7159404ff7d538d9d405b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2100e374251a8fc00cce1916cfc50f3cb652cbe3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54fa25ffab2b700df5abd58c136d64a912c53953"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8bf8d5dade4c5e1d8a2386f29253ed28b5d87735"},{"type":"WEB","url":"https://git.kernel.org/stable/c/df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e36a82bebbf7da814530d5a179bef9df5934b717"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec15405b80fc15ffc87a23d01378ae061c1aba07"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f55cb52ec98b22125f5bda36391edb8894f7e8cf"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54232.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54232"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f2325ecebc5b7988fd49968bd3a660fd1594dc84"},{"fixed":"1a6059f5ed57f48edfe7159404ff7d538d9d405b"},{"fixed":"f55cb52ec98b22125f5bda36391edb8894f7e8cf"},{"fixed":"2100e374251a8fc00cce1916cfc50f3cb652cbe3"},{"fixed":"df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8"},{"fixed":"8bf8d5dade4c5e1d8a2386f29253ed28b5d87735"},{"fixed":"54fa25ffab2b700df5abd58c136d64a912c53953"},{"fixed":"ec15405b80fc15ffc87a23d01378ae061c1aba07"},{"fixed":"e36a82bebbf7da814530d5a179bef9df5934b717"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54232.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.18"},{"fixed":"4.14.312"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.280"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.240"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.177"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.105"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54232.json"}}],"schema_version":"1.7.5"}