{"api_version":"1","generated_at":"2026-07-23T20:01:00+00:00","cve":"CVE-2026-63969","urls":{"html":"https://cve.report/CVE-2026-63969","api":"https://cve.report/api/cve/CVE-2026-63969.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63969","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63969"},"summary":{"title":"ipv6: fix possible infinite loop in rt6_fill_node()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible infinite loop in rt6_fill_node()\n\nSashiko reported this issue [1]. Apply the same fix as\ncommit f8d8ce1b515a (\"ipv6: fix possible infinite loop in fib6_info_uses_dev()\").\n\nWriters holding tb6_lock can list_del_rcu(&rt->fib6_siblings)\nwithout waiting for RCU readers; rt->fib6_siblings.next then still\npoints into the old ring and this softirq-side walker never reaches\n&rt->fib6_siblings, causing a CPU stall. fib6_del_route() always\nWRITE_ONCE()s rt->fib6_nsiblings to 0 before list_del_rcu(), so an\ninside-loop check is a reliable detach signal.\n\n[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:15","updated_at":"2026-07-19 16:17:15"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81","name":"https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d","name":"https://git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529","name":"https://git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383","name":"https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14","name":"https://git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc","name":"https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63969","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63969","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 b014a63d2f2c2c767762b548381882dfb1655529 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 52da02521ede55fb86546c3fffd9377b3261b91f 279853aec9f58d5cd723e6e5617c1c3337b30383 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34a949e7a0869dfa31a40416d2a56973fae1807b c65b1f60237daac7c56c2652e064cc566a45dc81 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d9ccb18f83ea2bb654289b6ecf014fd267cc988b dc36a04621dcc2447dae428709207810b6c06e14 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d9ccb18f83ea2bb654289b6ecf014fd267cc988b 5e40de719ee76b8d96e2556ce36dbd3bd07bf37d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d9ccb18f83ea2bb654289b6ecf014fd267cc988b 9f72412bcf60144f252b0d6205106abf14344abc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11edcd026012ac18acee0f1514db3ed1b160fc6f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.128 6.1.176 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.75 6.6.143 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.2 6.12.93 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.11.11 6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63969","cve":"CVE-2026-63969","epss":"0.002050000","percentile":"0.107250000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/route.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b014a63d2f2c2c767762b548381882dfb1655529","status":"affected","version":"d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2","versionType":"git"},{"lessThan":"279853aec9f58d5cd723e6e5617c1c3337b30383","status":"affected","version":"52da02521ede55fb86546c3fffd9377b3261b91f","versionType":"git"},{"lessThan":"c65b1f60237daac7c56c2652e064cc566a45dc81","status":"affected","version":"34a949e7a0869dfa31a40416d2a56973fae1807b","versionType":"git"},{"lessThan":"dc36a04621dcc2447dae428709207810b6c06e14","status":"affected","version":"d9ccb18f83ea2bb654289b6ecf014fd267cc988b","versionType":"git"},{"lessThan":"5e40de719ee76b8d96e2556ce36dbd3bd07bf37d","status":"affected","version":"d9ccb18f83ea2bb654289b6ecf014fd267cc988b","versionType":"git"},{"lessThan":"9f72412bcf60144f252b0d6205106abf14344abc","status":"affected","version":"d9ccb18f83ea2bb654289b6ecf014fd267cc988b","versionType":"git"},{"status":"affected","version":"11edcd026012ac18acee0f1514db3ed1b160fc6f","versionType":"git"},{"lessThan":"6.1.176","status":"affected","version":"6.1.128","versionType":"semver"},{"lessThan":"6.6.143","status":"affected","version":"6.6.75","versionType":"semver"},{"lessThan":"6.12.93","status":"affected","version":"6.12.2","versionType":"semver"},{"lessThan":"6.12","status":"affected","version":"6.11.11","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/route.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.13"},{"lessThan":"6.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"6.1.128","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"6.6.75","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"6.12.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.35","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.12","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible infinite loop in rt6_fill_node()\n\nSashiko reported this issue [1]. Apply the same fix as\ncommit f8d8ce1b515a (\"ipv6: fix possible infinite loop in fib6_info_uses_dev()\").\n\nWriters holding tb6_lock can list_del_rcu(&rt->fib6_siblings)\nwithout waiting for RCU readers; rt->fib6_siblings.next then still\npoints into the old ring and this softirq-side walker never reaches\n&rt->fib6_siblings, causing a CPU stall. fib6_del_route() always\nWRITE_ONCE()s rt->fib6_nsiblings to 0 before list_del_rcu(), so an\ninside-loop check is a reliable detach signal.\n\n[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev"}],"providerMetadata":{"dateUpdated":"2026-07-19T14:55:56.330Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529"},{"url":"https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383"},{"url":"https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81"},{"url":"https://git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14"},{"url":"https://git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d"},{"url":"https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc"}],"title":"ipv6: fix possible infinite loop in rt6_fill_node()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63969","datePublished":"2026-07-19T14:55:56.330Z","dateReserved":"2026-07-19T07:54:57.024Z","dateUpdated":"2026-07-19T14:55:56.330Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:15","lastModifiedDate":"2026-07-19 16:17:15","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63969","Ordinal":"1","Title":"ipv6: fix possible infinite loop in rt6_fill_node()","CVE":"CVE-2026-63969","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63969","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible infinite loop in rt6_fill_node()\n\nSashiko reported this issue [1]. Apply the same fix as\ncommit f8d8ce1b515a (\"ipv6: fix possible infinite loop in fib6_info_uses_dev()\").\n\nWriters holding tb6_lock can list_del_rcu(&rt->fib6_siblings)\nwithout waiting for RCU readers; rt->fib6_siblings.next then still\npoints into the old ring and this softirq-side walker never reaches\n&rt->fib6_siblings, causing a CPU stall. fib6_del_route() always\nWRITE_ONCE()s rt->fib6_nsiblings to 0 before list_del_rcu(), so an\ninside-loop check is a reliable detach signal.\n\n[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev","Type":"Description","Title":"ipv6: fix possible infinite loop in rt6_fill_node()"}]}}}