misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()

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Summary

CVECVE-2026-46022
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:20 UTC
Updated2026-06-01 17:17:18 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000320000 probability, percentile 0.097350000 (date 2026-06-04)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 6f6ecc9153df176e956d0664b56f93080b0a45f0 git Not specified
CNA Linux Linux affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 bac8643486f854dd53af9b23aea7dbbd9b7c1865 git Not specified
CNA Linux Linux affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab git Not specified
CNA Linux Linux affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 fc7e9a74e32299d7e93e178ca482a0b59ef1595b git Not specified
CNA Linux Linux affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 07c4f18b303106e6b24492c12b95d48a4b985841 git Not specified
CNA Linux Linux affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 22a16d3eafee92a165c756081587c95850127107 git Not specified
CNA Linux Linux affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 1ca75f6b74ec7f685464e5745ecfcf3a76d284e9 git Not specified
CNA Linux Linux affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 4b6e6ead556734bdc14024c5f837132b1e7a4b84 git Not specified
CNA Linux Linux affected 2.6.13 Not specified
CNA Linux Linux unaffected 2.6.13 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/07c4f18b303106e6b24492c12b95d48a4b985841 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fc7e9a74e32299d7e93e178ca482a0b59ef1595b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bac8643486f854dd53af9b23aea7dbbd9b7c1865 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/22a16d3eafee92a165c756081587c95850127107 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6f6ecc9153df176e956d0664b56f93080b0a45f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1ca75f6b74ec7f685464e5745ecfcf3a76d284e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b6e6ead556734bdc14024c5f837132b1e7a4b84 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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