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CVE-2026-80584— s390/qeth: validate user buffer length in SNMP and ARP query ioctls

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，以下漏洞已得到修复： s390/qeth：在 SNMP 和 ARP 查询 ioctl 中验证用户缓冲区长度 和 根据用户提供的长度（ ）分配缓冲区，但未对其下限进行检查，随后将 设置为一个固定的非零值，并将两者传递给响应回调函数。该回调函数通过以下逻辑进行边界检查： 由于这两个字段均为 类型，当 小于 时，减法会发生无符号整数下溢（wrap-around），导致检查意外通过，随后的 调用会写入超出分配区域的内存。此外，当 为 0 时， 可能返回 ，而现有的 NULL 检查无法捕获这种情况。

CVSS 8.4 · High

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4a71df50047f0db65ea09b1be155852e81a45eba< 9d00eeb2d27f4cc817c5e408760226d43f811ec6 affected
4a71df50047f0db65ea09b1be155852e81a45eba< 46443eaddebd84c51940857b11787229be169dec affected
4a71df50047f0db65ea09b1be155852e81a45eba< 91935843f9396a9e45253e2c0d4337ca1371754b affected
4a71df50047f0db65ea09b1be155852e81a45eba< cc423f4105fe145b33e1d7cad34245a798358f73 affected
4a71df50047f0db65ea09b1be155852e81a45eba< 3083818e67bcd656965797fbac9a3d6c1d44f78a affected
4a71df50047f0db65ea09b1be155852e81a45eba< a3083647747942ea32faf14560d6397ff3068046 affected
4a71df50047f0db65ea09b1be155852e81a45eba< 75fb3151513d7d9f77a8f9545418279b119c06b8 affected
4a71df50047f0db65ea09b1be155852e81a45eba< d141f087b1af656f055d7c5793a3e87817ba0bbe affected
… +10 more rows
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I. Basic Information for CVE-2026-80584

Vulnerability Information
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Vulnerability Title
s390/qeth: validate user buffer length in SNMP and ARP query ioctls
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/qeth: validate user buffer length in SNMP and ARP query ioctls qeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by a user-supplied length (udata_len) without checking a lower bound, then set udata_offset to a fixed non-zero value and pass both to a reply callback. The callback bounds-checks the copy with if ((udata_len - udata_offset) < len) Both fields are u32, so a udata_len smaller than udata_offset makes the subtraction wrap and the check pass, and the following memcpy() writes past the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from kzalloc(), which the existing NULL check does not catch. Reject buffers smaller than udata_offset before allocating, so the callback subtraction can no longer underflow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 4a71df50047f0db65ea09b1be155852e81a45eba ~ 9d00eeb2d27f4cc817c5e408760226d43f811ec6 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2026-80584

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III. Intelligence Information for CVE-2026-80584

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Patches & Fixes for CVE-2026-80584 (8)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock
CVE-2026-80548 8.8 HIGH s390/vfio_ccw: Selectively expand io_mutex
CVE-2026-80552 8.8 HIGH s390/vfio_ccw: Ensure index for read/write regions are within range

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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