In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO hwsim_tx_info_frame_received_nl() casts the HWSIM_ATTR_TX_INFO payload to a struct hwsim_tx_rate * and unconditionally reads IEEE80211_TX_MAX_RATES entries (8 bytes) from it. The policy only bounds the attribute from above (NLA_BINARY .len is a maximum) and the op sets GENL_DONT_VALIDATE_STRICT, so a short or zero-length attribute is accepted and the loop reads past the payload. Require the exact length in the policy, so a malformed attribute is rejected before the handler runs.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98887.mbox cve-icon
https://git.kernel.org/stable/c/13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7 cve-icon cve-icon
https://git.kernel.org/stable/c/1ae85bb34fe3510659b86d6a5f8036dd498233f8 cve-icon cve-icon
https://git.kernel.org/stable/c/3a96bb65b4b820d8b41fa155781ec1c29e3479d4 cve-icon cve-icon
https://git.kernel.org/stable/c/3dc723ac78a6e4fa0fd49e27e487ed319da40a9f cve-icon cve-icon
https://git.kernel.org/stable/c/59e1f2a0242232b4a3af144ae317d3913fc09046 cve-icon cve-icon
https://git.kernel.org/stable/c/6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695 cve-icon cve-icon
https://git.kernel.org/stable/c/b5b1234bbfa25537fb9a5c0d62c328ed4547f721 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-98887 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-98887 cve-icon
History

Tue, 27 Oct 2026 04:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Fri, 23 Oct 2026 18:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-125

Fri, 23 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
First Time appeared Linux linux
Vendors & Products Linux linux

Fri, 23 Oct 2026 12:00:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO hwsim_tx_info_frame_received_nl() casts the HWSIM_ATTR_TX_INFO payload to a struct hwsim_tx_rate * and unconditionally reads IEEE80211_TX_MAX_RATES entries (8 bytes) from it. The policy only bounds the attribute from above (NLA_BINARY .len is a maximum) and the op sets GENL_DONT_VALIDATE_STRICT, so a short or zero-length attribute is accepted and the loop reads past the payload. Require the exact length in the policy, so a malformed attribute is rejected before the handler runs.
Title wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-10-23T11:37:44.605Z

Updated: 2026-10-26T06:56:11.864Z

Reserved: 2026-09-25T10:25:14.378Z

Link: CVE-2026-98887

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-23T12:18:22.460

Modified: 2026-10-26T07:17:13.743

Link: CVE-2026-98887

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-23T00:00:00Z

Links: CVE-2026-98887 - Bugzilla