{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31738", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.138Z", "datePublished": "2026-05-01T14:14:34.900Z", "dateUpdated": "2026-05-01T14:14:34.900Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-01T14:14:34.900Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: validate ND option lengths in vxlan_na_create\n\nvxlan_na_create() walks ND options according to option-provided\nlengths. A malformed option can make the parser advance beyond the\ncomputed option span or use a too-short source LLADDR option payload.\n\nValidate option lengths against the remaining NS option area before\nadvancing, and only read source LLADDR when the option is large enough\nfor an Ethernet address."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/vxlan/vxlan_core.c"], "versions": [{"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "901c1dd3bab2955d7e664f914c374c8c3ac2b958", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "e476745917a1e288eb15e7ff49d286a86a4861d3", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "2029712fb2c87e9a8c75094906f2ee29bf08c500", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "602596c69a70e50d9ab8c6ae0290a01f88229dd7", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "de20d2e3b9179d132f5f5b44e490d7c916c6321b", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "eddfce70a6f3107d1679b0c2fcbeb96b593bd679", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "b69c4236255bd8de16cd876e58c6f0867d1d78b1", "status": "affected", "versionType": "git"}, {"version": "4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa", "lessThan": "afa9a05e6c4971bd5586f1b304e14d61fb3d9385", "status": "affected", "versionType": "git"}, {"version": "d8be18c52dbc94989f6d74637b731af39cd3d902", "status": "affected", "versionType": "git"}, {"version": "3927dace523706cc00f808520eaf2125dd7c07b5", "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/net/vxlan/vxlan_core.c"], "versions": [{"version": "3.14", "status": "affected"}, {"version": "0", "lessThan": "3.14", "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": "3.14", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958"}, {"url": "https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3"}, {"url": "https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"}, {"url": "https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"}, {"url": "https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"}, {"url": "https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"}, {"url": "https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1"}, {"url": "https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"}], "title": "vxlan: validate ND option lengths in vxlan_na_create", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: validate ND option lengths in vxlan_na_create\n\nvxlan_na_create() walks ND options according to option-provided\nlengths. A malformed option can make the parser advance beyond the\ncomputed option span or use a too-short source LLADDR option payload.\n\nValidate option lengths against the remaining NS option area before\nadvancing, and only read source LLADDR when the option is large enough\nfor an Ethernet address."}], "id": "CVE-2026-31738", "lastModified": "2026-05-01T15:24:14.893", "metrics": {}, "published": "2026-05-01T15:16:36.473", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2029712fb2c87e9a8c75094906f2ee29bf08c500"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: vxlan: validate ND option lengths in vxlan_na_create", "id": "2464419", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464419"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-1284", "details": ["A flaw was found in the Linux kernel's Virtual Extensible LAN (VXLAN) implementation. A remote attacker could exploit this vulnerability by sending specially crafted Neighbor Discovery (ND) options to the `vxlan_na_create` function. This could cause the parser to read beyond the intended memory boundaries or use an incorrectly sized source Link-Layer Address (LLADDR) option payload, potentially leading to memory corruption and system instability or a denial of service."], "name": "CVE-2026-31738", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "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-2026-31738\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31738\nhttps://lore.kernel.org/linux-cve-announce/2026050138-CVE-2026-31738-7d4e@gregkh/T"], "threat_severity": "Moderate"}