FKIE_CVE-2026-63969

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-19 16:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible infinite loop in rt6_fill_node() Sashiko reported this issue [1]. Apply the same fix as commit f8d8ce1b515a ("ipv6: fix possible infinite loop in fib6_info_uses_dev()"). Writers holding tb6_lock can list_del_rcu(&rt->fib6_siblings) without waiting for RCU readers; rt->fib6_siblings.next then still points into the old ring and this softirq-side walker never reaches &rt->fib6_siblings, causing a CPU stall. fib6_del_route() always WRITE_ONCE()s rt->fib6_nsiblings to 0 before list_del_rcu(), so an inside-loop check is a reliable detach signal. [1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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(\u0026rt-\u003efib6_siblings)\nwithout waiting for RCU readers; rt-\u003efib6_siblings.next then still\npoints into the old ring and this softirq-side walker never reaches\n\u0026rt-\u003efib6_siblings, causing a CPU stall. fib6_del_route() always\nWRITE_ONCE()s rt-\u003efib6_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": "2026-07-19T16:17:15.947",
  "metrics": {},
  "published": "2026-07-19T16:17:15.947",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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