{"id":"CVE-2026-31692","state":"PUBLISHED","title":"rtnetlink: add missing netlink_ns_capable() check for peer netns","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrtnetlink: add missing netlink_ns_capable() check for peer netns\n\nrtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer\nnetwork namespace when creating paired devices (veth, vxcan,\nnetkit). This allows an unprivileged user with a user namespace\nto create interfaces in arbitrary network namespaces, including\ninit_net.\n\nAdd a netlink_ns_capable() check for CAP_NET_ADMIN in the peer\nnamespace before allowing device creation to proceed.","publishedAt":"2026-04-30T10:34:51.589Z","updatedAt":"2026-05-11T22:13:52.952Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"81adee47dfb608df3ad0b91d230fb3cef75f0060","status":"affected","lessThan":"0975b64ffb34560042090a5986c3a02e6c80f36f","versionType":"git"},{"version":"81adee47dfb608df3ad0b91d230fb3cef75f0060","status":"affected","lessThan":"d04cc16d3624218a5458b2b664ae431f1b3b334d","versionType":"git"},{"version":"81adee47dfb608df3ad0b91d230fb3cef75f0060","status":"affected","lessThan":"7b735ef81286007794a227ce2539419479c02a5f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/rtnetlink.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/rtnetlink.c"]}],"references":["https://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f","https://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d","https://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31692.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31692","state":"PUBLISHED","datePublished":"2026-04-30T10:34:51.589Z","dateUpdated":"2026-05-11T22:13:52.952Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.131Z"},"containers":{"cna":{"title":"rtnetlink: add missing netlink_ns_capable() check for peer netns","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrtnetlink: add missing netlink_ns_capable() check for peer netns\n\nrtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer\nnetwork namespace when creating paired devices (veth, vxcan,\nnetkit). This allows an unprivileged user with a user namespace\nto create interfaces in arbitrary network namespaces, including\ninit_net.\n\nAdd a netlink_ns_capable() check for CAP_NET_ADMIN in the peer\nnamespace before allowing device creation to proceed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"81adee47dfb608df3ad0b91d230fb3cef75f0060","status":"affected","lessThan":"0975b64ffb34560042090a5986c3a02e6c80f36f","versionType":"git"},{"version":"81adee47dfb608df3ad0b91d230fb3cef75f0060","status":"affected","lessThan":"d04cc16d3624218a5458b2b664ae431f1b3b334d","versionType":"git"},{"version":"81adee47dfb608df3ad0b91d230fb3cef75f0060","status":"affected","lessThan":"7b735ef81286007794a227ce2539419479c02a5f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/rtnetlink.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/rtnetlink.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0975b64ffb34560042090a5986c3a02e6c80f36f"},{"url":"https://git.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d"},{"url":"https://git.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:13:52.952Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}