FKIE_CVE-2026-97939

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-10-30 13:21
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ipmr: account multicast table and route memory A netadmin in a user+net namespace can create many IPv4 and IPv6 multicast routing tables with MRT_TABLE and MRT6_TABLE. Each unseen id allocates an mr_table via the shared mr_table_alloc(), links it into the per-net list, and leaves it until netns teardown. Those objects were not charged to memcg, so the host unreclaimable slab grows with the table count. Account mr_table allocations with GFP_KERNEL_ACCOUNT and mark the IPv4/IPv6 MFC caches SLAB_ACCOUNT. This matches the established handling of IP addresses, routes and alternate interface names. Unresolved MFC entries are still allocated from softIRQ with GFP_ATOMIC and are not charged. They expire after 10 seconds and are bounded by the socket receive queue; see commit 0079ad8e8dc3 ("ipmr: remove hard code cache_resolve_queue_len limit").
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0264b3ee09b118fec8a5471b4ca288f8ab84722f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/20424f267c9dbdfcade28b2b2306767a7dfb43d1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/21e0749e8ef272ac7e3eefe0fa488a5983f4b038
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e808d8dfebd8f114a747bd90c8f7d2a6fd7474f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57c523e95ea2608a19e6bfcd664d641ddf7bc4b4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7ee18725f2292ab554aa96a101ae42d45f008bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec1c6140394ee87127479bc500a3158b125bf07a
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ipmr.c",
            "net/ipv4/ipmr_base.c",
            "net/ipv6/ip6mr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3e808d8dfebd8f114a747bd90c8f7d2a6fd7474f",
              "status": "affected",
              "version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
              "versionType": "git"
            },
            {
              "lessThan": "57c523e95ea2608a19e6bfcd664d641ddf7bc4b4",
              "status": "affected",
              "version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
              "versionType": "git"
            },
            {
              "lessThan": "20424f267c9dbdfcade28b2b2306767a7dfb43d1",
              "status": "affected",
              "version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
              "versionType": "git"
            },
            {
              "lessThan": "21e0749e8ef272ac7e3eefe0fa488a5983f4b038",
              "status": "affected",
              "version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
              "versionType": "git"
            },
            {
              "lessThan": "ec1c6140394ee87127479bc500a3158b125bf07a",
              "status": "affected",
              "version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
              "versionType": "git"
            },
            {
              "lessThan": "0264b3ee09b118fec8a5471b4ca288f8ab84722f",
              "status": "affected",
              "version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
              "versionType": "git"
            },
            {
              "lessThan": "d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c",
              "status": "affected",
              "version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
              "versionType": "git"
            },
            {
              "lessThan": "b7ee18725f2292ab554aa96a101ae42d45f008bd",
              "status": "affected",
              "version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ipmr.c",
            "net/ipv4/ipmr_base.c",
            "net/ipv6/ip6mr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.35"
            },
            {
              "lessThan": "2.6.35",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "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\nipmr: account multicast table and route memory\n\nA netadmin in a user+net namespace can create many IPv4 and IPv6\nmulticast routing tables with MRT_TABLE and MRT6_TABLE. Each unseen\nid allocates an mr_table via the shared mr_table_alloc(), links it\ninto the per-net list, and leaves it until netns teardown. Those\nobjects were not charged to memcg, so the host unreclaimable slab\ngrows with the table count.\n\nAccount mr_table allocations with GFP_KERNEL_ACCOUNT and mark the\nIPv4/IPv6 MFC caches SLAB_ACCOUNT. This matches the established\nhandling of IP addresses, routes and alternate interface names.\n\nUnresolved MFC entries are still allocated from softIRQ with\nGFP_ATOMIC and are not charged. They expire after 10 seconds and are\nbounded by the socket receive queue; see commit 0079ad8e8dc3\n(\"ipmr: remove hard code cache_resolve_queue_len limit\")."
    }
  ],
  "id": "CVE-2026-97939",
  "lastModified": "2026-10-30T13:21:10.883",
  "metrics": {},
  "published": "2026-09-25T11:17:21.303",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0264b3ee09b118fec8a5471b4ca288f8ab84722f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/20424f267c9dbdfcade28b2b2306767a7dfb43d1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/21e0749e8ef272ac7e3eefe0fa488a5983f4b038"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3e808d8dfebd8f114a747bd90c8f7d2a6fd7474f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/57c523e95ea2608a19e6bfcd664d641ddf7bc4b4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b7ee18725f2292ab554aa96a101ae42d45f008bd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ec1c6140394ee87127479bc500a3158b125bf07a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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