{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40173","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.177Z","datePublished":"2025-11-12T10:53:49.571Z","dateUpdated":"2026-05-11T21:44:10.569Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:44:10.569Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ip6_tunnel: Prevent perpetual tunnel growth\n\nSimilarly to ipv4 tunnel, ipv6 version updates dev->needed_headroom, too.\nWhile ipv4 tunnel headroom adjustment growth was limited in\ncommit 5ae1e9922bbd (\"net: ip_tunnel: prevent perpetual headroom growth\"),\nipv6 tunnel yet increases the headroom without any ceiling.\n\nReflect ipv4 tunnel headroom adjustment limit on ipv6 version.\n\nCredits to Francesco Ruggeri, who was originally debugging this issue\nand wrote local Arista-specific patch and a reproducer."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/ip_tunnels.h","net/ipv4/ip_tunnel.c","net/ipv6/ip6_tunnel.c"],"versions":[{"version":"8eb30be0352d09165e94a41fef1c7b994dca0714","lessThan":"566f8d5c8a443f2dd69c5460fdec43ed1c870c65","status":"affected","versionType":"git"},{"version":"8eb30be0352d09165e94a41fef1c7b994dca0714","lessThan":"11f6066af3bfb8149aa16c42c0b0c5ea5b199a94","status":"affected","versionType":"git"},{"version":"8eb30be0352d09165e94a41fef1c7b994dca0714","lessThan":"402b6985e872b4cf394bbbf33b503947a326a6cb","status":"affected","versionType":"git"},{"version":"8eb30be0352d09165e94a41fef1c7b994dca0714","lessThan":"10fe967efe73c610e526ff7460581610633dee9c","status":"affected","versionType":"git"},{"version":"8eb30be0352d09165e94a41fef1c7b994dca0714","lessThan":"48294a67863c9cfa367abb66bbf0ef6548ae124f","status":"affected","versionType":"git"},{"version":"8eb30be0352d09165e94a41fef1c7b994dca0714","lessThan":"eeb4345488672584db4f8c20a1ae13a212ce31c4","status":"affected","versionType":"git"},{"version":"8eb30be0352d09165e94a41fef1c7b994dca0714","lessThan":"b6eb25d870f1a8ae571fd3da2244b71df547824b","status":"affected","versionType":"git"},{"version":"8eb30be0352d09165e94a41fef1c7b994dca0714","lessThan":"21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/ip_tunnels.h","net/ipv4/ip_tunnel.c","net/ipv6/ip6_tunnel.c"],"versions":[{"version":"4.7","status":"affected"},{"version":"0","lessThan":"4.7","status":"unaffected","versionType":"semver"},{"version":"5.4.301","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.246","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.196","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.158","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.114","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.55","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.17.5","lessThanOrEqual":"6.17.*","status":"unaffected","versionType":"semver"},{"version":"6.18","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":"4.7","versionEndExcluding":"5.4.301"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.10.246"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.15.196"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.17.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/566f8d5c8a443f2dd69c5460fdec43ed1c870c65"},{"url":"https://git.kernel.org/stable/c/11f6066af3bfb8149aa16c42c0b0c5ea5b199a94"},{"url":"https://git.kernel.org/stable/c/402b6985e872b4cf394bbbf33b503947a326a6cb"},{"url":"https://git.kernel.org/stable/c/10fe967efe73c610e526ff7460581610633dee9c"},{"url":"https://git.kernel.org/stable/c/48294a67863c9cfa367abb66bbf0ef6548ae124f"},{"url":"https://git.kernel.org/stable/c/eeb4345488672584db4f8c20a1ae13a212ce31c4"},{"url":"https://git.kernel.org/stable/c/b6eb25d870f1a8ae571fd3da2244b71df547824b"},{"url":"https://git.kernel.org/stable/c/21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16"}],"title":"net/ip6_tunnel: Prevent perpetual tunnel growth","x_generator":{"engine":"bippy-1.2.0"}}}}