# CVE-2026-89489: linux: In the Linux kernel, the following vulnerability has been resolved:  openrisc: fix arbitrary kernel memory access via...

CVE-2026-89489 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89489, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-89489
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 11, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  openrisc: fix arbitrary kernel memory access via or1k_atomic syscall  sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly.      l.lwz   r29,0(r4)     l.lwz   r27,0(r5)     l.sw    0(r4),r27     l.sw    0(r5),r29  The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries.  A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly.  This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context.  Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT.  [shorne@gmail.com: fix comment style]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-89489](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89489.md) | Sep 23, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-89489](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89489.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-89489](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89489.md) | Sep 23, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.111-1~deb12u1 | [DEBIAN-CVE-2026-89489](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89489.md) | Sep 23, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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