SECUFOCUSNOW
Home›CVE index›CVE-2026-80584
ReviewHigh

CVE-2026-80584

Linux

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 allocatio...

CVSS
8.4
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.27
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.4

Vulnerability overview

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 allocatio...

Affected product and versions

Product
Linux
Affected versions
>= 4a71df50047f0db65ea09b1be155852e81a45eba < 9d00eeb2d27f4cc817c5e408760226d43f811ec6, >= 4a71df50047f0db65ea09b1be155852e81a45eba < 46443eaddebd84c51940857b11787229be169dec, >= 4a71df50047f0db65ea09b1be155852e81a45eba < 91935843f9396a9e45253e2c0d4337ca1371754b, >= 4a71df50047f0db65ea09b1be155852e81a45eba < cc423f4105fe145b33e1d7cad34245a798358f73, >= 4a71df50047f0db65ea09b1be155852e81a45eba < 3083818e67bcd656965797fbac9a3d6c1d44f78a, >= 4a71df50047f0db65ea09b1be155852e81a45eba < a3083647747942ea32faf14560d6397ff3068046, >= 4a71df50047f0db65ea09b1be155852e81a45eba < 75fb3151513d7d9f77a8f9545418279b119c06b8, >= 4a71df50047f0db65ea09b1be155852e81a45eba < d141f087b1af656f055d7c5793a3e87817ba0bbe, >= 2.6.26
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available