CVE-2026-31786

{"id": "CVE-2026-31786", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa", "lessThan": "e3af585e1728c917682b6a3de9a69b41fb9194d4", "versionType": "git"}, {"status": "affected", "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa", "lessThan": "8288d031a01dbacfde3fc643f7be3d23504de64d", "versionType": "git"}, {"status": "affected", "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa", "lessThan": "f458ba102da97fafca106327086fc95f3fc764cb", "versionType": "git"}, {"status": "affected", "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa", "lessThan": "4b4defd2fce3f966c25adabf46644a85558f1169", "versionType": "git"}, {"status": "affected", "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa", "lessThan": "5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a", "versionType": "git"}, {"status": "affected", "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa", "lessThan": "d5f59216650c51e5e3fcb7517c825bc8047f60ef", "versionType": "git"}, {"status": "affected", "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa", "lessThan": "52cecff98bda2c51eed1c6ce9d21c5d6268fb19d", "versionType": "git"}, {"status": "affected", "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa", "lessThan": "27fdbab4221b375de54bf91919798d88520c6e28", "versionType": "git"}], "programFiles": ["drivers/xen/sys-hypervisor.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.13"}, {"status": "unaffected", "version": "0", "lessThan": "4.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.254", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.204", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.170", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.137", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.85", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.26", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.3", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/xen/sys-hypervisor.c"], "defaultStatus": "affected"}]}], "published": "2026-04-30T11:16:20.967", "references": [{"url": "https://git.kernel.org/stable/c/27fdbab4221b375de54bf91919798d88520c6e28", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4b4defd2fce3f966c25adabf46644a85558f1169", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/52cecff98bda2c51eed1c6ce9d21c5d6268fb19d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8288d031a01dbacfde3fc643f7be3d23504de64d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d5f59216650c51e5e3fcb7517c825bc8047f60ef", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e3af585e1728c917682b6a3de9a69b41fb9194d4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f458ba102da97fafca106327086fc95f3fc764cb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/28/12", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://xenbits.xen.org/xsa/advisory-485.html", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBuffer overflow in drivers/xen/sys-hypervisor.c\n\nThe build id returned by HYPERVISOR_xen_version(XENVER_build_id) is\nneither NUL terminated nor a string.\n\nThe first causes a buffer overflow as sprintf in buildid_show will\nread and copy till it finds a NUL.\n\n00000000 f4 91 51 f4 dd 38 9e 9d 65 47 52 eb 10 71 db 50 |..Q..8..eGR..q.P|\n00000010 b9 a8 01 42 6f 2e 32 |...Bo.2|\n00000017\n\nSo use a memcpy instead of sprintf to have the correct value:\n\n00000000 f4 91 51 f4 dd 00 9e 9d 65 47 52 eb 10 71 db 50 |..Q.....eGR..q.P|\n00000010 b9 a8 01 42 |...B|\n00000014\n\n(the above have a hack to embed a zero inside and check it's\nreturned correctly).\n\nThis is XSA-485 / CVE-2026-31786"}], "lastModified": "2026-06-17T10:34:27.637", "configurations": [{"nodes": [{"negate": false, "cpeMatch": 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