Linux Kernel up to 7.1.9 s390 qeth qeth_snmp_command udata_len buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.8$0-$5k0.61-

Summaryinfo

A vulnerability described as very critical has been identified in Linux Kernel up to 7.1.9. This vulnerability affects the function qeth_snmp_command of the component s390 qeth. The manipulation of the argument udata_len results in buffer overflow. This vulnerability is cataloged as CVE-2026-80584. The attack must be initiated from a local position. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 7.1.9. Affected is the function qeth_snmp_command of the component s390 qeth. The manipulation of the argument udata_len with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-80584 since 08/26/2026. The exploitability is told to be easy. The attack needs to be approached locally. Additional levels of successful authentication are needed for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/26/2026).

Upgrading to version 5.10.266, 5.15.217, 6.1.184, 6.6.153, 6.12.105, 6.18.46 or 7.1.10 eliminates this vulnerability. Applying the patch 9d00eeb2d27f4cc817c5e408760226d43f811ec6/46443eaddebd84c51940857b11787229be169dec/91935843f9396a9e45253e2c0d4337ca1371754b/cc423f4105fe145b33e1d7cad34245a798358f73/3083818e67bcd656965797fbac9a3d6c1d44f78a/a3083647747942ea32faf14560d6397ff3068046/75fb3151513d7d9f77a8f9545418279b119c06b8/d141f087b1af656f055d7c5793a3e87817ba0bbe is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.266/5.15.217/6.1.184/6.6.153/6.12.105/6.18.46/7.1.10
Patch: 9d00eeb2d27f4cc817c5e408760226d43f811ec6/46443eaddebd84c51940857b11787229be169dec/91935843f9396a9e45253e2c0d4337ca1371754b/cc423f4105fe145b33e1d7cad34245a798358f73/3083818e67bcd656965797fbac9a3d6c1d44f78a/a3083647747942ea32faf14560d6397ff3068046/75fb3151513d7d9f77a8f9545418279b119c06b8/d141f087b1af656f055d7c5793a3e87817ba0bbe

Timelineinfo

08/26/2026 Advisory disclosed
08/26/2026 +0 days CVE reserved
08/26/2026 +0 days VulDB entry created
08/26/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80584 (🔒)
GCVE (CVE): GCVE-0-2026-80584
GCVE (VulDB): GCVE-100-395904

Entryinfo

Created: 08/26/2026 18:11
Changes: 08/26/2026 18:11 (23), 08/26/2026 18:12 (37)
Complete: 🔍
Cache ID: 216::103

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