{"cve":"CVE-2021-46928","nvd":{"published":"2024-02-27T10:15:07.517","modified":"2026-06-17T04:15:52.853","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Clear stale IIR value on instruction access rights trap\n\nWhen a trap 7 (Instruction access rights) occurs, this means the CPU\ncouldn't execute an instruction due to missing execute permissions on\nthe memory region.  In this case it seems the CPU didn't even fetched\nthe instruction from memory and thus did not store it in the cr19 (IIR)\nregister before calling the trap handler. So, the trap handler will find\nsome random old stale value in cr19.\n\nThis patch simply overwrites the stale IIR value with a constant magic\n\"bad food\" value (0xbaadf00d), in the hope people don't start to try to\nunderstand the various random IIR values in trap 7 dumps.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-755"],"references":["https://git.kernel.org/stable/c/484730e5862f6b872dca13840bed40fd7c60fa26","https://git.kernel.org/stable/c/d01e9ce1af6116f812491d3d3873d204f10ae0b8","https://git.kernel.org/stable/c/e96373f0a5f484bc1e193f9951dcb3adf24bf3f7","https://git.kernel.org/stable/c/484730e5862f6b872dca13840bed40fd7c60fa26","https://git.kernel.org/stable/c/d01e9ce1af6116f812491d3d3873d204f10ae0b8"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:45:59.823092188+00:00"},"epss":{"cve":"CVE-2021-46928","score":0.00225,"percentile":0.13215,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}