CVE-2026-89489openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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]
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a before bf310718c6fa6adeee06d207a55489546d860e2c; from 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a before 497cba0b02e5555d99fe9ee1dc478af743ab7f7a; 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a builds before 1f2e92e499d863f81df1732af59b4a3559969193; from 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a before 574ae2ac2b314aa33498cd2c28add106cbe644f2; from 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a before a520e8cac54fb403f3800125b606f55fcad42cb9; from 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a before d64a75369cd0f2ee79afcc9d9ca34a3890989379; from 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a before b53435c079c78f89f70a62dd5a322cca4e292b34; from 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a before 78004e9a87f240df03e2f73120d291763c32e0a7 | CNA record |
References
- https://git.kernel.org/stable/c/bf310718c6fa6adeee06d207a55489546d860e2c
- https://git.kernel.org/stable/c/497cba0b02e5555d99fe9ee1dc478af743ab7f7a
- https://git.kernel.org/stable/c/1f2e92e499d863f81df1732af59b4a3559969193
- https://git.kernel.org/stable/c/574ae2ac2b314aa33498cd2c28add106cbe644f2
- https://git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9
- https://git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379
- https://git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34
- https://git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.