CVE-2026-63969

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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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/route.c"], "versions": [{"version": "d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2", "lessThan": "b014a63d2f2c2c767762b548381882dfb1655529", "status": "affected", "versionType": "git"}, {"version": "52da02521ede55fb86546c3fffd9377b3261b91f", "lessThan": "279853aec9f58d5cd723e6e5617c1c3337b30383", "status": "affected", "versionType": "git"}, {"version": "34a949e7a0869dfa31a40416d2a56973fae1807b", "lessThan": "c65b1f60237daac7c56c2652e064cc566a45dc81", "status": "affected", "versionType": "git"}, {"version": "d9ccb18f83ea2bb654289b6ecf014fd267cc988b", "lessThan": "dc36a04621dcc2447dae428709207810b6c06e14", "status": "affected", "versionType": "git"}, {"version": "d9ccb18f83ea2bb654289b6ecf014fd267cc988b", "lessThan": "5e40de719ee76b8d96e2556ce36dbd3bd07bf37d", "status": "affected", "versionType": "git"}, {"version": "d9ccb18f83ea2bb654289b6ecf014fd267cc988b", "lessThan": "9f72412bcf60144f252b0d6205106abf14344abc", "status": "affected", "versionType": "git"}, {"version": "11edcd026012ac18acee0f1514db3ed1b160fc6f", "status": "affected", "versionType": "git"}, {"version": "6.1.128", "lessThan": "6.1.176", "status": "affected", "versionType": "semver"}, {"version": "6.6.75", "lessThan": "6.6.143", "status": "affected", "versionType": "semver"}, {"version": "6.12.2", "lessThan": "6.12.93", "status": "affected", "versionType": "semver"}, {"version": "6.11.11", "lessThan": "6.12", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/route.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.1.128", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.75", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.2", "versionEndExcluding": "6.12.93"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11.11"}]}]}], "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"}}}}

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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"}], "id": "CVE-2026-63969", "lastModified": "2026-11-12T15:03:33.070", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-07-19T16:17:15.947", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipv6: fix possible infinite loop in rt6_fill_node()", "id": "2502391", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502391"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipv6: fix possible infinite loop in rt6_fill_node()\nSashiko reported this issue [1]. Apply the same fix as\ncommit f8d8ce1b515a (\"ipv6: fix possible infinite loop in fib6_info_uses_dev()\").\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[1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev", "A flaw was found in the Linux kernel's IPv6 networking subsystem. A local attacker could trigger an infinite loop within the `rt6_fill_node()` function. This occurs when a writer removes an entry from a list without proper synchronization, causing a softirq-side process to continuously loop. The consequence of this vulnerability is a CPU stall, leading to a Denial of Service (DoS) for the system."], "name": "CVE-2026-63969", "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63969\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63969\nhttps://lore.kernel.org/linux-cve-announce/2026071959-CVE-2026-63969-04d4@gregkh/T"], "threat_severity": "Moderate"}

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