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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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/comedi/drivers/me4000.c"], "versions": [{"version": "ac584af599452748187cf6d7865b1607c54ee443", "lessThan": "8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6", "status": "affected", "versionType": "git"}, {"version": "ac584af599452748187cf6d7865b1607c54ee443", "lessThan": "64b24b713e1a3ea6624480594b4f8c2ff86502f2", "status": "affected", "versionType": "git"}, {"version": "ac584af599452748187cf6d7865b1607c54ee443", "lessThan": "f72b5567f7c117b46b4058dc6a0c7554f8565561", "status": "affected", "versionType": "git"}, {"version": "ac584af599452748187cf6d7865b1607c54ee443", "lessThan": "1603dd471f47762e9d1f52304edb3e49a7e62655", "status": "affected", "versionType": "git"}, {"version": "ac584af599452748187cf6d7865b1607c54ee443", "lessThan": "99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5", "status": "affected", "versionType": "git"}, {"version": "ac584af599452748187cf6d7865b1607c54ee443", "lessThan": "eae19cab44204537f79146f15a51811b13227c38", "status": "affected", "versionType": "git"}, {"version": "ac584af599452748187cf6d7865b1607c54ee443", "lessThan": "de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d", "status": "affected", "versionType": "git"}, {"version": "ac584af599452748187cf6d7865b1607c54ee443", "lessThan": "3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/comedi/drivers/me4000.c"], "versions": [{"version": "3.19", "status": "affected"}, {"version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}]}]}], "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"}], "title": "comedi: me4000: Fix potential overrun of firmware buffer", "x_generator": {"engine": "bippy-1.2.0"}}}}

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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. 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{"bugzilla": {"description": "kernel: comedi: me4000: Fix potential overrun of firmware buffer", "id": "2464399", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464399"}, "csaw": false, "cwe": "CWE-805", "details": ["A flaw was found in the Linux kernel's `comedi: me4000` driver. The `me4000_xilinx_download()` function fails to validate the length of the firmware data stream, trusting the value provided in the firmware header. A local attacker could exploit this by providing a specially crafted firmware image, leading to a buffer overrun. This could result in a denial of service (DoS) or potentially other system instabilities."], "name": "CVE-2026-31747", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31747\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31747\nhttps://lore.kernel.org/linux-cve-announce/2026050141-CVE-2026-31747-430e@gregkh/T"]}