CVE-2026-31750

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{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/comedi/comedi_fops.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "830c848aba9f047eb6b34288975ebeb8e8621451", "status": "affected", "version": "4e1da516debbe6a573ffa0392e2809d180d0575c", "versionType": "git"}, {"lessThan": "29f644f14b89e6c4965e3c89251929e451190a66", "status": "affected", "version": "4e1da516debbe6a573ffa0392e2809d180d0575c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/comedi/comedi_fops.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36", "versionEndExcluding": "6.19.12", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "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: runflags cannot determine whether to reclaim chanlist\n\nsyzbot reported a memory leak [1], because commit 4e1da516debb (\"comedi:\nAdd reference counting for Comedi command handling\") did not consider\nthe exceptional exit case in do_cmd_ioctl() where runflags is not set.\nThis caused chanlist not to be properly freed by do_become_nonbusy(),\nas it only frees chanlist when runflags is correctly set.\n\nAdded a check in do_become_nonbusy() for the case where runflags is not\nset, to properly free the chanlist memory.\n\n[1]\nBUG: memory leak\n backtrace (crc 844a0efa):\n __comedi_get_user_chanlist drivers/comedi/comedi_fops.c:1815 [inline]\n do_cmd_ioctl.part.0+0x112/0x350 drivers/comedi/comedi_fops.c:1890\n do_cmd_ioctl drivers/comedi/comedi_fops.c:1858 [inline]"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: runflags no puede determinar si debe reclamar chanlist\n\nsyzbot inform\u00f3 de una fuga de memoria [1], porque el commit 4e1da516debb (\u2019comedi: Add reference counting for Comedi command handling\u2019) no consider\u00f3 el caso de salida excepcional en do_cmd_ioctl() donde runflags no est\u00e1 establecido. Esto caus\u00f3 que chanlist no fuera liberado correctamente por do_become_nonbusy(), ya que solo libera chanlist cuando runflags est\u00e1 correctamente establecido.\n\nSe a\u00f1adi\u00f3 una comprobaci\u00f3n en do_become_nonbusy() para el caso en que runflags no est\u00e1 establecido, para liberar correctamente la memoria de chanlist.\n\n[1]\nERROR: fuga de memoria\n rastreo (crc 844a0efa):\n __comedi_get_user_chanlist drivers/comedi/comedi_fops.c:1815 [inline]\n do_cmd_ioctl.part.0+0x112/0x350 drivers/comedi/comedi_fops.c:1890\n do_cmd_ioctl drivers/comedi/comedi_fops.c:1858 [inline]"}], "id": "CVE-2026-31750", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-01T15:16:37.850", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/29f644f14b89e6c4965e3c89251929e451190a66"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/830c848aba9f047eb6b34288975ebeb8e8621451"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: comedi: runflags cannot determine whether to reclaim chanlist", "id": "2464489", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464489"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's comedi driver. An exceptional exit case in the do_cmd_ioctl() function, where a runflags variable is not properly set, prevents the chanlist memory from being freed. This memory leak can lead to a denial of service (DoS) condition, potentially impacting system stability and availability."], "name": "CVE-2026-31750", "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-2026-31750\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31750\nhttps://lore.kernel.org/linux-cve-announce/2026050142-CVE-2026-31750-2118@gregkh/T"]}

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