{"id":"CVE-2026-31747","state":"PUBLISHED","title":"comedi: me4000: Fix potential overrun of firmware buffer","description":"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.","publishedAt":"2026-05-01T14:14:40.844Z","updatedAt":"2026-05-11T22:14:59.031Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"64b24b713e1a3ea6624480594b4f8c2ff86502f2","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"f72b5567f7c117b46b4058dc6a0c7554f8565561","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"1603dd471f47762e9d1f52304edb3e49a7e62655","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"eae19cab44204537f79146f15a51811b13227c38","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/me4000.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/me4000.c"]}],"references":["https://git.kernel.org/stable/c/8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6","https://git.kernel.org/stable/c/64b24b713e1a3ea6624480594b4f8c2ff86502f2","https://git.kernel.org/stable/c/f72b5567f7c117b46b4058dc6a0c7554f8565561","https://git.kernel.org/stable/c/1603dd471f47762e9d1f52304edb3e49a7e62655","https://git.kernel.org/stable/c/99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5","https://git.kernel.org/stable/c/eae19cab44204537f79146f15a51811b13227c38","https://git.kernel.org/stable/c/de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d","https://git.kernel.org/stable/c/3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31747.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31747","state":"PUBLISHED","datePublished":"2026-05-01T14:14:40.844Z","dateUpdated":"2026-05-11T22:14:59.031Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.138Z"},"containers":{"cna":{"title":"comedi: me4000: Fix potential overrun of firmware buffer","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"64b24b713e1a3ea6624480594b4f8c2ff86502f2","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"f72b5567f7c117b46b4058dc6a0c7554f8565561","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"1603dd471f47762e9d1f52304edb3e49a7e62655","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"eae19cab44204537f79146f15a51811b13227c38","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d","versionType":"git"},{"version":"ac584af599452748187cf6d7865b1607c54ee443","status":"affected","lessThan":"3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/me4000.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/me4000.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6"},{"url":"https://git.kernel.org/stable/c/64b24b713e1a3ea6624480594b4f8c2ff86502f2"},{"url":"https://git.kernel.org/stable/c/f72b5567f7c117b46b4058dc6a0c7554f8565561"},{"url":"https://git.kernel.org/stable/c/1603dd471f47762e9d1f52304edb3e49a7e62655"},{"url":"https://git.kernel.org/stable/c/99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5"},{"url":"https://git.kernel.org/stable/c/eae19cab44204537f79146f15a51811b13227c38"},{"url":"https://git.kernel.org/stable/c/de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d"},{"url":"https://git.kernel.org/stable/c/3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:14:59.031Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}