CVE-2026-31748

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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. Although it checks that the supplied firmware is at least 16\nbytes long, it does not check that it is long enough to contain the data\nstream.\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`."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/comedi/drivers/me_daq.c"], "versions": [{"version": "85acac61096f946a78cf0c4b65f7cebe580693b6", "lessThan": "2fc25a4c2e055cd42ea39a1b42c89bfef70e0319", "status": "affected", "versionType": "git"}, {"version": "85acac61096f946a78cf0c4b65f7cebe580693b6", "lessThan": "9f39fa07259eb342908e4aa0271dee038a8ce4f8", "status": "affected", "versionType": "git"}, {"version": "85acac61096f946a78cf0c4b65f7cebe580693b6", "lessThan": "f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8", "status": "affected", "versionType": "git"}, {"version": "85acac61096f946a78cf0c4b65f7cebe580693b6", "lessThan": "c16ac4e173a05011437a2d868f70cc415339065a", "status": "affected", "versionType": "git"}, {"version": "85acac61096f946a78cf0c4b65f7cebe580693b6", "lessThan": "1bf8761eb59e94bf7b8c17b2a1ee48f14378b172", "status": "affected", "versionType": "git"}, {"version": "85acac61096f946a78cf0c4b65f7cebe580693b6", "lessThan": "a47ae40339c1048f519df33ff8840731720f57cb", "status": "affected", "versionType": "git"}, {"version": "85acac61096f946a78cf0c4b65f7cebe580693b6", "lessThan": "c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b", "status": "affected", "versionType": "git"}, {"version": "85acac61096f946a78cf0c4b65f7cebe580693b6", "lessThan": "cc797d4821c754c701d9714b58bea947e31dbbe0", "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/me_daq.c"], "versions": [{"version": "2.6.29", "status": "affected"}, {"version": "0", "lessThan": "2.6.29", "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": "2.6.29", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2fc25a4c2e055cd42ea39a1b42c89bfef70e0319"}, {"url": "https://git.kernel.org/stable/c/9f39fa07259eb342908e4aa0271dee038a8ce4f8"}, {"url": "https://git.kernel.org/stable/c/f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8"}, {"url": "https://git.kernel.org/stable/c/c16ac4e173a05011437a2d868f70cc415339065a"}, {"url": "https://git.kernel.org/stable/c/1bf8761eb59e94bf7b8c17b2a1ee48f14378b172"}, {"url": "https://git.kernel.org/stable/c/a47ae40339c1048f519df33ff8840731720f57cb"}, {"url": "https://git.kernel.org/stable/c/c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b"}, {"url": "https://git.kernel.org/stable/c/cc797d4821c754c701d9714b58bea947e31dbbe0"}], "title": "comedi: me_daq: Fix potential overrun of firmware buffer", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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"vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: me_daq: Fix potential overrun of firmware buffer\n\n`me2600_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. Although it checks that the supplied firmware is at least 16\nbytes long, it does not check that it is long enough to contain the data\nstream.\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`."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: me_daq: Soluciona un posible desbordamiento del b\u00fafer de firmware\n\n\u2019me2600_xilinx_download()\u2019 carga el firmware que fue solicitado por \u2019request_firmware()\u2019. Es posible que desborde el b\u00fafer de origen porque conf\u00eda ciegamente en el formato del archivo. Lee una longitud de flujo de datos de los primeros 4 bytes en la variable \u2019file_length\u2019 y lee el contenido del flujo de datos de longitud \u2019file_length\u2019 desde el desplazamiento 16 en adelante. Aunque comprueba que el firmware suministrado tiene al menos 16 bytes de longitud, no comprueba que sea lo suficientemente largo para contener el flujo de datos.\n\nA\u00f1ade una prueba para asegurar que el firmware suministrado sea lo suficientemente largo para contener la cabecera y el flujo de datos. En caso de fallo, registra un error y devuelve \u2019-EINVAL\u2019."}], "id": "CVE-2026-31748", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-01T15:16:37.593", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1bf8761eb59e94bf7b8c17b2a1ee48f14378b172"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2fc25a4c2e055cd42ea39a1b42c89bfef70e0319"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9f39fa07259eb342908e4aa0271dee038a8ce4f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a47ae40339c1048f519df33ff8840731720f57cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c16ac4e173a05011437a2d868f70cc415339065a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cc797d4821c754c701d9714b58bea947e31dbbe0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: comedi: me_daq: Fix potential overrun of firmware buffer", "id": "2464383", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464383"}, "csaw": false, "cwe": "CWE-1284", "details": ["A flaw was found in the Linux kernel's comedi: me_daq module. The `me2600_xilinx_download()` function, responsible for loading firmware, does not adequately validate the length of the provided firmware data stream. This vulnerability allows for a buffer overrun, which can lead to memory corruption within the kernel. This could potentially cause system instability or other undefined behavior."], "name": "CVE-2026-31748", "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-2026-31748\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31748\nhttps://lore.kernel.org/linux-cve-announce/2026050141-CVE-2026-31748-ab3e@gregkh/T"]}

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