openrisc: fix arbitrary kernel memory access via or1k_atomic syscall

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89489
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:30 UTC
Updated2026-09-11 20:19:30 UTC
DescriptionIn 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. [[email protected]: fix comment style]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a a520e8cac54fb403f3800125b606f55fcad42cb9 git Not specified
CNA Linux Linux affected 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a d64a75369cd0f2ee79afcc9d9ca34a3890989379 git Not specified
CNA Linux Linux affected 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a b53435c079c78f89f70a62dd5a322cca4e292b34 git Not specified
CNA Linux Linux affected 9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a 78004e9a87f240df03e2f73120d291763c32e0a7 git Not specified
CNA Linux Linux affected 3.1 Not specified
CNA Linux Linux unaffected 3.1 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/78004e9a87f240df03e2f73120d291763c32e0a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a520e8cac54fb403f3800125b606f55fcad42cb9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b53435c079c78f89f70a62dd5a322cca4e292b34 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d64a75369cd0f2ee79afcc9d9ca34a3890989379 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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