CVE-2026-46022
Description
In the Linux kernel, the following vulnerability has been resolved: misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt() ibmasm_handle_mouse_interrupt() performs an out-of-bounds MMIO read when the queue reader or writer index from hardware exceeds REMOTE_QUEUE_SIZE (60). A compromised service processor can trigger this by writing an out-of-range value to the reader or writer MMIO register before asserting an interrupt. Since writer is re-read from hardware on every loop iteration, it can also be set to an out-of-range value after the loop has already started. The root cause is that get_queue_reader() and get_queue_writer() return raw readl() values that are passed directly into get_queue_entry(), which computes: queue_begin + reader * sizeof(struct remote_input) with no bounds check. This unchecked MMIO address is then passed to memcpy_fromio(), reading 8 bytes from unintended device registers. For sufficiently large values the address falls outside the PCI BAR mapping entirely, triggering a machine check exception. Fix by checking both indices against REMOTE_QUEUE_SIZE at the top of the loop body, before any call to get_queue_entry(). On an out-of-range value, reset the reader register to 0 via set_queue_reader() before breaking, so that normal queue operation can resume if the corrupted hardware state is transient.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Windows Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.86-1 |
| sid | Fixed | 7.0.4-1 |
| forky | Fixed | 7.0.4-1 |
| bullseye | Affected | — |
| bookworm | Affected | — |
References
- https://git.kernel.org/stable/c/fc7e9a74e32299d7e93e178ca482a0b59ef1595b
- https://git.kernel.org/stable/c/07c4f18b303106e6b24492c12b95d48a4b985841
- https://git.kernel.org/stable/c/22a16d3eafee92a165c756081587c95850127107
- https://git.kernel.org/stable/c/1ca75f6b74ec7f685464e5745ecfcf3a76d284e9
- https://git.kernel.org/stable/c/4b6e6ead556734bdc14024c5f837132b1e7a4b84
- https://security-tracker.debian.org/tracker/CVE-2026-46022
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46022
- https://git.kernel.org/stable/c/6f6ecc9153df176e956d0664b56f93080b0a45f0
- https://git.kernel.org/stable/c/bac8643486f854dd53af9b23aea7dbbd9b7c1865
- https://git.kernel.org/stable/c/f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab
- https://www.suse.com/security/cve/CVE-2026-46022.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.