# CVE-2023-54232: linux: In the Linux kernel, the following vulnerability has been resolved:  m68k: Only force 030 bus error if PC not in exce...

CVE-2023-54232 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-54232, released December 30, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-54232
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 30, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.25-1 | [DEBIAN-CVE-2023-54232](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54232.md) | Dec 30, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.25-1 | [DEBIAN-CVE-2023-54232](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54232.md) | Dec 30, 2025 |
| Linux | linux Debian 14 | 6.1.25-1 | [DEBIAN-CVE-2023-54232](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54232.md) | Dec 30, 2025 |

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