FKIE_CVE-2026-98603

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-19 10:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ovpn: replace bind when clearing stale local source The UDP output fallback clears bind->local in place when the remembered source address is no longer usable. The bind is RCU-published and read locklessly by concurrent TX, so an IPv6 reader can observe a torn address. Retry the route lookup with source address autoselection without modifying the bind. After a successful lookup, revalidate the bind and route key under peer->lock, reset the dst cache, and best-effort publish a replacement bind with a wildcard local address. Do not cache the resolved dst when clearing the local source. Replacing the source invalidates all per-CPU cache entries, while dst_cache_set_ip4 and dst_cache_set_ip6 update only the current CPU slot. The current packet can still use the resolved route; if bind allocation fails, a later cache miss retries the repair.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72bd1bea37ea2c8553938f086bf48ccd2147dfe1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d8104988f423572df1f3347ce578037b1043f34
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c44a04722f7dae9a45a101b8e100931ab59f1c18
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ovpn/udp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c44a04722f7dae9a45a101b8e100931ab59f1c18",
              "status": "affected",
              "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
              "versionType": "git"
            },
            {
              "lessThan": "72bd1bea37ea2c8553938f086bf48ccd2147dfe1",
              "status": "affected",
              "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
              "versionType": "git"
            },
            {
              "lessThan": "7d8104988f423572df1f3347ce578037b1043f34",
              "status": "affected",
              "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ovpn/udp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\novpn: replace bind when clearing stale local source\n\nThe UDP output fallback clears bind-\u003elocal in place when the remembered\nsource address is no longer usable. The bind is RCU-published and read\nlocklessly by concurrent TX, so an IPv6 reader can observe a torn\naddress.\n\nRetry the route lookup with source address autoselection without\nmodifying the bind. After a successful lookup, revalidate the bind and\nroute key under peer-\u003elock, reset the dst cache, and best-effort publish\na replacement bind with a wildcard local address.\n\nDo not cache the resolved dst when clearing the local source. Replacing\nthe source invalidates all per-CPU cache entries, while\ndst_cache_set_ip4 and dst_cache_set_ip6 update only the current CPU\nslot. The current packet can still use the resolved route; if bind\nallocation fails, a later cache miss retries the repair."
    }
  ],
  "id": "CVE-2026-98603",
  "lastModified": "2026-10-19T10:19:22.037",
  "metrics": {},
  "published": "2026-10-18T16:17:13.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/72bd1bea37ea2c8553938f086bf48ccd2147dfe1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7d8104988f423572df1f3347ce578037b1043f34"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c44a04722f7dae9a45a101b8e100931ab59f1c18"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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