CVE-2026-98419 is a vulnerability in Linux Kernel
Published on October 14, 2026
drop_monitor: fix out-of-bounds write in reset_per_cpu_data()
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.
Products Associated with CVE-2026-98419
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Affected Versions
Linux:- Version 683703a26e4677db437a1480682851e27c7a154f and below caf09c09e0f323015ab6777ed1bad5aa10688631 is affected.
- Version 683703a26e4677db437a1480682851e27c7a154f and below 56b12f0cd476e4d90a0e2663a80102b388ebf78c is affected.
- Version 683703a26e4677db437a1480682851e27c7a154f and below 88d640efd655b10f9fa4e381caf777da1f17c2a6 is affected.
- Version 683703a26e4677db437a1480682851e27c7a154f and below d54a044136b129822715e8798899af540ec7a9e9 is affected.
- Version 683703a26e4677db437a1480682851e27c7a154f and below 8a04047c6dbff2f49a561b1ff53b043f4807e855 is affected.
- Version 683703a26e4677db437a1480682851e27c7a154f and below 530ae0a1458078c7a81fbffd9ff17d42129364d9 is affected.
- Version 683703a26e4677db437a1480682851e27c7a154f and below 03b672eba4937ff18337049824a114012d57f202 is affected.
- Version 683703a26e4677db437a1480682851e27c7a154f and below 439f392084f8f7f59ab9d47a9579185accefe1d8 is affected.
- Version 2.6.31 is affected.
- Before 2.6.31 is unaffected.
- Version 5.10.271, <= 5.10.* is unaffected.
- Version 5.15.222, <= 5.15.* is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.54, <= 6.18.* is unaffected.
- Version 7.2.8, <= 7.2.* is unaffected.
- Version 7.3-rc4, <= * is unaffected.