CVE-2023-54232
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).
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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.
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/1a6059f5ed57f48edfe7159404ff7d538d9d405b
- https://git.kernel.org/stable/c/2100e374251a8fc00cce1916cfc50f3cb652cbe3
- https://git.kernel.org/stable/c/54fa25ffab2b700df5abd58c136d64a912c53953
- https://git.kernel.org/stable/c/8bf8d5dade4c5e1d8a2386f29253ed28b5d87735
- https://git.kernel.org/stable/c/df1da53a7e98f0b2a0eb2241c154f148f2f2c1d8
- https://git.kernel.org/stable/c/e36a82bebbf7da814530d5a179bef9df5934b717
- https://git.kernel.org/stable/c/ec15405b80fc15ffc87a23d01378ae061c1aba07
- https://git.kernel.org/stable/c/f55cb52ec98b22125f5bda36391edb8894f7e8cf
JSON original (NVD)
Mostrar
{
"id": "CVE-2023-54232",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
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"vendor": "Linux",
"product": "Linux",
"versions": [
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"status": "affected",
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"vendor": "Linux",
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"version": "2.6.18"
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{
"status": "unaffected",
"version": "0",
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"versionType": "semver"
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{
"status": "unaffected",
"version": "4.14.312",
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{
"status": "unaffected",
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{
"status": "unaffected",
"version": "5.4.240",
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},
{
"status": "unaffected",
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{
"status": "unaffected",
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"versionType": "semver",
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{
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"published": "2025-12-30T13:16:11.623",
"references": [
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{
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{
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"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'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."
}
],
"lastModified": "2026-06-17T06:47:03.677",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}