CVE-2026-98419
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: drop_monitor: fix out-of-bounds write in reset_per_cpu_data() In reset_per_cpu_data(), al is computed as: al = sizeof(struct net_dm_alert_msg); al += dm_hit_limit * sizeof(struct net_dm_drop_point); al += sizeof(struct nlattr); skb = genlmsg_new(al, GFP_KERNEL); ... nla = nla_reserve(skb, NLA_UNSPEC, sizeof(struct net_dm_alert_msg)); ... msg = nla_data(nla); memset(msg, 0, al); Because al includes sizeof(struct nlattr) (the 4-byte attribute header), genlmsg_new() allocates al bytes of tailroom starting at nla. However, msg points to nla_data(nla), which is located sizeof(struct nlattr) bytes past nla. Calling memset(msg, 0, al) therefore writes al bytes starting from msg, exceeding the allocated buffer by sizeof(struct nlattr) (4 bytes) and corrupting skb_shared_info. Fix this by letting al represent only the payload length, allocating the skb with genlmsg_new(nla_total_size(al), GFP_KERNEL), and zeroing al bytes from msg.
Severity
HIGH
CVSS score
7.0
(v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-10-14 14:17:53.290000
Last modified
2026-10-24 14:16:41.123000
View original CVE JSON
{
"id": "CVE-2026-98419",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-14T14:17:53.290",
"lastModified": "2026-10-24T14:16:41.123",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: fix out-of-bounds write in reset_per_cpu_data()\n\nIn reset_per_cpu_data(), al is computed as:\n\n al = sizeof(struct net_dm_alert_msg);\n al += dm_hit_limit * sizeof(struct net_dm_drop_point);\n al += sizeof(struct nlattr);\n\n skb = genlmsg_new(al, GFP_KERNEL);\n ...\n nla = nla_reserve(skb, NLA_UNSPEC, sizeof(struct net_dm_alert_msg));\n ...\n msg = nla_data(nla);\n memset(msg, 0, al);\n\nBecause al includes sizeof(struct nlattr) (the 4-byte attribute header),\ngenlmsg_new() allocates al bytes of tailroom starting at nla.\nHowever, msg points to nla_data(nla), which is located\nsizeof(struct nlattr) bytes past nla. Calling memset(msg, 0, al)\ntherefore writes al bytes starting from msg, exceeding the allocated\nbuffer by sizeof(struct nlattr) (4 bytes) and corrupting\nskb_shared_info.\n\nFix this by letting al represent only the payload length, allocating\nthe skb with genlmsg_new(nla_total_size(al), GFP_KERNEL), and zeroing\nal bytes from msg."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/core/drop_monitor.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "683703a26e4677db437a1480682851e27c7a154f",
"lessThan": "caf09c09e0f323015ab6777ed1bad5aa10688631",
"versionType": "git",
"status": "affected"
},
{
"version": "683703a26e4677db437a1480682851e27c7a154f",
"lessThan": "56b12f0cd476e4d90a0e2663a80102b388ebf78c",
"versionType": "git",
"status": "affected"
},
{
"version": "683703a26e4677db437a1480682851e27c7a154f",
"lessThan": "88d640efd655b10f9fa4e381caf777da1f17c2a6",
"versionType": "git",
"status": "affected"
},
{
"version": "683703a26e4677db437a1480682851e27c7a154f",
"lessThan": "d54a044136b129822715e8798899af540ec7a9e9",
"versionType": "git",
"status": "affected"
},
{
"version": "683703a26e4677db437a1480682851e27c7a154f",
"lessThan": "8a04047c6dbff2f49a561b1ff53b043f4807e855",
"versionType": "git",
"status": "affected"
},
{
"version": "683703a26e4677db437a1480682851e27c7a154f",
"lessThan": "530ae0a1458078c7a81fbffd9ff17d42129364d9",
"versionType": "git",
"status": "affected"
},
{
"version": "683703a26e4677db437a1480682851e27c7a154f",
"lessThan": "03b672eba4937ff18337049824a114012d57f202",
"versionType": "git",
"status": "affected"
},
{
"version": "683703a26e4677db437a1480682851e27c7a154f",
"lessThan": "439f392084f8f7f59ab9d47a9579185accefe1d8",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/core/drop_monitor.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "2.6.31",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.31",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.271",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.222",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.54",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.8",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "HIGH",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.0,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/03b672eba4937ff18337049824a114012d57f202",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/439f392084f8f7f59ab9d47a9579185accefe1d8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/530ae0a1458078c7a81fbffd9ff17d42129364d9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/56b12f0cd476e4d90a0e2663a80102b388ebf78c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/88d640efd655b10f9fa4e381caf777da1f17c2a6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8a04047c6dbff2f49a561b1ff53b043f4807e855",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/caf09c09e0f323015ab6777ed1bad5aa10688631",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d54a044136b129822715e8798899af540ec7a9e9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}