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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
278d72ae8803ffcd16070c95fe1d53f4466dc741 to < 6f6ecc9153df176e956d0664b56f93080b0a45f0affected278d72ae8803ffcd16070c95fe1d53f4466dc741 to < bac8643486f854dd53af9b23aea7dbbd9b7c1865affected278d72ae8803ffcd16070c95fe1d53f4466dc741 to < f7e5b4eefd7be3e09f8bd5fee63ed478fd7446abaffected278d72ae8803ffcd16070c95fe1d53f4466dc741 to < fc7e9a74e32299d7e93e178ca482a0b59ef1595baffected278d72ae8803ffcd16070c95fe1d53f4466dc741 to < 07c4f18b303106e6b24492c12b95d48a4b985841affected278d72ae8803ffcd16070c95fe1d53f4466dc741 to < 22a16d3eafee92a165c756081587c95850127107affected278d72ae8803ffcd16070c95fe1d53f4466dc741 to < 1ca75f6b74ec7f685464e5745ecfcf3a76d284e9affected278d72ae8803ffcd16070c95fe1d53f4466dc741 to < 4b6e6ead556734bdc14024c5f837132b1e7a4b84affected
Linux Linux
Default version status: affected
2.6.13affected0 to < 2.6.13unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.140 to ≤ 6.6.*unaffected6.12.86 to ≤ 6.12.*unaffected6.18.27 to ≤ 6.18.*unaffected7.0.4 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/6f6ecc9153df176e956d0664b56f93080b0a45f0 ↗
- https://git.kernel.org/stable/c/bac8643486f854dd53af9b23aea7dbbd9b7c1865 ↗
- https://git.kernel.org/stable/c/f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab ↗
- 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://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗