CVE-2026-46022misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()
- 7.1HighCVSS base score
- 0.15%Exploitation in 30 daysEPSS · top 96% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.15% · top 96% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 – < 6f6ecc9153df176e956d0664b56f93080b0a45f0
- affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 – < bac8643486f854dd53af9b23aea7dbbd9b7c1865
- affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 – < f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab
- affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 – < fc7e9a74e32299d7e93e178ca482a0b59ef1595b
- affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 – < 07c4f18b303106e6b24492c12b95d48a4b985841
- affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 – < 22a16d3eafee92a165c756081587c95850127107
- affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 – < 1ca75f6b74ec7f685464e5745ecfcf3a76d284e9
- affected 278d72ae8803ffcd16070c95fe1d53f4466dc741 – < 4b6e6ead556734bdc14024c5f837132b1e7a4b84
- affected 2.6.13
- unaffected < 2.6.13
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.140 – ≤ 6.6.*
- unaffected 6.12.86 – ≤ 6.12.*
- unaffected 6.18.27 – ≤ 6.18.*
- unaffected 7.0.4 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References9
- https://git.kernel.org/stable/c/6f6ecc9153df176e956d0664b56f93080b0a45f0 (opens in a new tab)
- https://git.kernel.org/stable/c/bac8643486f854dd53af9b23aea7dbbd9b7c1865 (opens in a new tab)
- https://git.kernel.org/stable/c/f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab (opens in a new tab)
- https://git.kernel.org/stable/c/fc7e9a74e32299d7e93e178ca482a0b59ef1595b (opens in a new tab)
- https://git.kernel.org/stable/c/07c4f18b303106e6b24492c12b95d48a4b985841 (opens in a new tab)
- https://git.kernel.org/stable/c/22a16d3eafee92a165c756081587c95850127107 (opens in a new tab)
- https://git.kernel.org/stable/c/1ca75f6b74ec7f685464e5745ecfcf3a76d284e9 (opens in a new tab)
- https://git.kernel.org/stable/c/4b6e6ead556734bdc14024c5f837132b1e7a4b84 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-32403 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-46022)Record last updated .