CVE-2026-97939
Full vulnerability record from the local CVENow database.
Description
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").
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-25 11:17:21.303000
Last modified
2026-10-30 13:21:10.883000
View original CVE JSON
{
"id": "CVE-2026-97939",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-25T11:17:21.303",
"lastModified": "2026-10-30T13:21:10.883",
"vulnStatus": "Received",
"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\")."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"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",
"versions": [
{
"version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
"lessThan": "3e808d8dfebd8f114a747bd90c8f7d2a6fd7474f",
"versionType": "git",
"status": "affected"
},
{
"version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
"lessThan": "57c523e95ea2608a19e6bfcd664d641ddf7bc4b4",
"versionType": "git",
"status": "affected"
},
{
"version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
"lessThan": "20424f267c9dbdfcade28b2b2306767a7dfb43d1",
"versionType": "git",
"status": "affected"
},
{
"version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
"lessThan": "21e0749e8ef272ac7e3eefe0fa488a5983f4b038",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "ec1c6140394ee87127479bc500a3158b125bf07a",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "0264b3ee09b118fec8a5471b4ca288f8ab84722f",
"versionType": "git",
"status": "affected"
},
{
"version": "f0ad0860d01e47a3ffd220564c5c653b3afbe962",
"lessThan": "d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "b7ee18725f2292ab554aa96a101ae42d45f008bd",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"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",
"versions": [
{
"version": "2.6.35",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.35",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.53",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.7",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"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",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}