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CVE-2026-98419— drop_monitor: fix out-of-bounds write in reset_per_cpu_data()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已修复： drop_monitor：修复 reset_per_cpu_data() 中的越界写入问题 在 函数中，变量 的计算方式如下： 由于 包含了 （即 4 字节的属性头）， 会在从 开始的尾部缓冲区中分配 字节的空间。然而， 指向的是 ，其位置位于 起始地址之后 字节处。因此，执行 时，将从 开始写入 字节的数据，导致实际写入长度超出已分配的缓冲区 （4 字节），从而损坏 结构。 修复方法是：让 仅表示有效载荷（payload）的长度，使用 分配 skb，并从 开始将 字节清零

AI Predicted 7.8 Difficulty: Moderate EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1069.002 · Domain Groups

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 683703a26e4677db437a1480682851e27c7a154f< caf09c09e0f323015ab6777ed1bad5aa10688631 affected
683703a26e4677db437a1480682851e27c7a154f< 56b12f0cd476e4d90a0e2663a80102b388ebf78c affected
683703a26e4677db437a1480682851e27c7a154f< 88d640efd655b10f9fa4e381caf777da1f17c2a6 affected
683703a26e4677db437a1480682851e27c7a154f< d54a044136b129822715e8798899af540ec7a9e9 affected
683703a26e4677db437a1480682851e27c7a154f< 8a04047c6dbff2f49a561b1ff53b043f4807e855 affected
683703a26e4677db437a1480682851e27c7a154f< 530ae0a1458078c7a81fbffd9ff17d42129364d9 affected
683703a26e4677db437a1480682851e27c7a154f< 03b672eba4937ff18337049824a114012d57f202 affected
683703a26e4677db437a1480682851e27c7a154f< 439f392084f8f7f59ab9d47a9579185accefe1d8 affected
… +10 more rows
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I. Basic Information for CVE-2026-98419

Vulnerability Information
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Vulnerability Title
drop_monitor: fix out-of-bounds write in reset_per_cpu_data()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 683703a26e4677db437a1480682851e27c7a154f ~ caf09c09e0f323015ab6777ed1bad5aa10688631 -
Linux Linux 2.6.31 -

II. Public POCs for CVE-2026-98419

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III. Intelligence Information for CVE-2026-98419

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Other References for CVE-2026-98419 (8)

Same Patch Batch · Linux · 2026-10-14 · 46 CVEs total

CVE-2026-98398 locking/lockdep: Invalidate stale class_cache entries for zapped classes
CVE-2026-98396 powerpc: Do not restore KUAP in arch_exit_to_user_mode_prepare()
CVE-2026-98393 net: ipv4: Fix UDP length overflow with PMTU discover and big MTU
CVE-2026-98391 drm/xe: Guard page-fault worker with runtime PM check
CVE-2026-98389 drm/amdgpu: skip gfx switch_power_profile during GPU reset
CVE-2026-98388 exec: do_close_on_exec() before taking exec_update_lock
CVE-2026-98387 s390/crypto: Fix skcipher_walk return code handling in aes_s390
CVE-2026-98386 scsi: qla2xxx: Use memset_io() to clear QLAFX00 request ring slot
CVE-2026-98390 x86/amd_node: Avoid divide by zero on virtualized systems
CVE-2026-98397 platform/x86: x86-android-tablets: hold device reference for secondary fwnode teardown
CVE-2026-98395 powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit
CVE-2026-98399 s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block
CVE-2026-98400 s390/ipl: Fix NULL deref in kdump without re-IPL parm block
CVE-2026-98402 net: icmp: avoid invalid transport header access in icmp_send tracepoint
CVE-2026-98401 net: iptunnel: fix stale transport header during tunnel decapsulation
CVE-2026-98403 s390/boot: Avoid IPL parameter append past command line
CVE-2026-98404 drm/virtio: Fix a NULL vs ERR_PTR() bug in virtio_gpu_user_framebuffer_create()
CVE-2026-98405 smb: client: fix missing iov bounds check in parse_posix_sids()
CVE-2026-98406 wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver
CVE-2026-98408 watchdog: rzv2h: Avoid division by zero

Showing top 20 of 46 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98419

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