{"id":"CVE-2026-31747","summary":"comedi: me4000: Fix potential overrun of firmware buffer","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: me4000: Fix potential overrun of firmware buffer\n\n`me4000_xilinx_download()` loads the firmware that was requested by\n`request_firmware()`.  It is possible for it to overrun the source\nbuffer because it blindly trusts the file format.  It reads a data\nstream length from the first 4 bytes into variable `file_length` and\nreads the data stream contents of length `file_length` from offset 16\nonwards.\n\nAdd a test to ensure that the supplied firmware is long enough to\ncontain the header and the data stream.  On failure, log an error and\nreturn `-EINVAL`.\n\nNote: The firmware loading was totally broken before commit ac584af59945\n(\"staging: comedi: me4000: fix firmware downloading\"), but that is the\nmost sensible target for this fix.","modified":"2026-07-08T08:06:22.058885526Z","published":"2026-05-01T14:14:40.844Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31747.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1603dd471f47762e9d1f52304edb3e49a7e62655"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64b24b713e1a3ea6624480594b4f8c2ff86502f2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eae19cab44204537f79146f15a51811b13227c38"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f72b5567f7c117b46b4058dc6a0c7554f8565561"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31747.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31747"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ac584af599452748187cf6d7865b1607c54ee443"},{"fixed":"8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6"},{"fixed":"64b24b713e1a3ea6624480594b4f8c2ff86502f2"},{"fixed":"f72b5567f7c117b46b4058dc6a0c7554f8565561"},{"fixed":"1603dd471f47762e9d1f52304edb3e49a7e62655"},{"fixed":"99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5"},{"fixed":"eae19cab44204537f79146f15a51811b13227c38"},{"fixed":"de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d"},{"fixed":"3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31747.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.19.0"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.134"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.81"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31747.json"}}],"schema_version":"1.7.5"}