CVE-2026-46022
published 2026-05-27CVE-2026-46022: In the Linux kernel, the following vulnerability has been resolved: misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()…
medium5.5
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.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 278d72ae8803ffcd16070c95fe1d53f4466dc741 < 6f6ecc9153df176e956d0664b56f93080b0a45f0 | 6f6ecc9153df176e956d0664b56f93080b0a45f0 |
| linux | linux | >= 278d72ae8803ffcd16070c95fe1d53f4466dc741 < bac8643486f854dd53af9b23aea7dbbd9b7c1865 | bac8643486f854dd53af9b23aea7dbbd9b7c1865 |
| linux | linux | >= 278d72ae8803ffcd16070c95fe1d53f4466dc741 < f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab | f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab |
| linux | linux | >= 278d72ae8803ffcd16070c95fe1d53f4466dc741 < fc7e9a74e32299d7e93e178ca482a0b59ef1595b | fc7e9a74e32299d7e93e178ca482a0b59ef1595b |
| linux | linux | >= 278d72ae8803ffcd16070c95fe1d53f4466dc741 < 07c4f18b303106e6b24492c12b95d48a4b985841 | 07c4f18b303106e6b24492c12b95d48a4b985841 |
| linux | linux | >= 278d72ae8803ffcd16070c95fe1d53f4466dc741 < 22a16d3eafee92a165c756081587c95850127107 | 22a16d3eafee92a165c756081587c95850127107 |
| linux | linux | >= 278d72ae8803ffcd16070c95fe1d53f4466dc741 < 1ca75f6b74ec7f685464e5745ecfcf3a76d284e9 | 1ca75f6b74ec7f685464e5745ecfcf3a76d284e9 |
| linux | linux | >= 278d72ae8803ffcd16070c95fe1d53f4466dc741 < 4b6e6ead556734bdc14024c5f837132b1e7a4b84 | 4b6e6ead556734bdc14024c5f837132b1e7a4b84 |
| linux | linux_kernel | — | — |