Answer in brief
CVE-2026-80584 records a High severity (CVSS 8.4) vulnerability in s390/qeth: validate user buffer length in SNMP and ARP query ioctls. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4a71df50047f0db65ea09b1be155852e81a45eba <9d00eeb2d27f4cc817c5e408760226d43f811ec6 || >=4a71df50047f0db65ea09b1be155852e81a45eba <46443eaddebd84c51940857b11787229be169dec || >=4a71df50047f0db65ea09b1be155852e81a45eba <91935843f9396a9e45253e2c0d4337ca1371754b || >=4a71df50047f0db65ea09b1be155852e81a45eba <cc423f4105fe145b33e1d7cad34245a798358f73 || >=4a71df50047f0db65ea09b1be155852e81a45eba <3083818e67bcd656965797fbac9a3d6c1d44f78a || >=4a71df50047f0db65ea09b1be155852e81a45eba <a3083647747942ea32faf14560d6397ff3068046 || >=4a71df50047f0db65ea09b1be155852e81a45eba <75fb3151513d7d9f77a8f9545418279b119c06b8 || >=4a71df50047f0db65ea09b1be155852e81a45eba <d141f087b1af656f055d7c5793a3e87817ba0bbe | 9d00eeb2d27f4cc817c5e408760226d43f811ec6, 46443eaddebd84c51940857b11787229be169dec, 91935843f9396a9e45253e2c0d4337ca1371754b, cc423f4105fe145b33e1d7cad34245a798358f73, 3083818e67bcd656965797fbac9a3d6c1d44f78a, a3083647747942ea32faf14560d6397ff3068046, 75fb3151513d7d9f77a8f9545418279b119c06b8, d141f087b1af656f055d7c5793a3e87817ba0bbe |
| Linux/Linuxgeneric | 2.6.26 | Not reported |
Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.