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8.8
HIGH CVSS 3.1
CVE-2026-64255
wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers Three BA session handlers use ffs(ba_data->sta_mask) - 1 to derive a station ID without checking that sta_mask is non-zero. When sta_mask is zero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing an out-of-bounds access on fw_id_to_link_sta[]. Add WARN_ON_ONCE(!ba_data->sta_mask) guards before each ffs() call, consistent with the existing check in iwl_mld_ampdu_rx_start().

Details
INFO

Published Date :

July 24, 2026, 4:16 p.m.

Last Modified :

Aug. 17, 2026, 5:17 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-64255 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Validate sta_mask before using it in BA session handlers to prevent out-of-bounds access.
  • Validate sta_mask before ffs() call.
  • Add WARN_ON_ONCE guards before ffs() calls.
  • Ensure ba_data->sta_mask is non-zero.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-64255.

URL Resource
https://git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103b Patch
https://git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 Patch
https://git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64255 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-64255 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-64255 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-64255 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': '1de92789ce31e46fa7e7d8e89c90b19cdb1c103b', 'versionType': 'git'}, {'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': 'fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc', 'versionType': 'git'}, {'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': 'f056fc2b927448d37eca6b6cacc3d1b0f67b20d2', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': '1de92789ce31e46fa7e7d8e89c90b19cdb1c103b', 'versionType': 'git'}, {'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': 'fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc', 'versionType': 'git'}, {'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': 'f056fc2b927448d37eca6b6cacc3d1b0f67b20d2', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'affected'}]
  • Initial Analysis by [email protected]

    Aug. 12, 2026

    Action Type Old Value New Value
    Added CWE CWE-125
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.3 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.4 up to (excluding) 6.18.38
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103b Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc Types: Patch
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 27, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '1de92789ce31e46fa7e7d8e89c90b19cdb1c103b', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'f056fc2b927448d37eca6b6cacc3d1b0f67b20d2', 'versionType': 'git'}, {'status': 'affected', 'version': '0', 'lessThan': '6.18.38', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '7.1.3', 'versionType': 'semver'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': '1de92789ce31e46fa7e7d8e89c90b19cdb1c103b', 'versionType': 'git'}, {'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': 'fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc', 'versionType': 'git'}, {'status': 'affected', 'version': '9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b', 'lessThan': 'f056fc2b927448d37eca6b6cacc3d1b0f67b20d2', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 24, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '1de92789ce31e46fa7e7d8e89c90b19cdb1c103b', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'f056fc2b927448d37eca6b6cacc3d1b0f67b20d2', 'versionType': 'git'}, {'status': 'affected', 'version': '0', 'lessThan': '6.18.38', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '7.1.3', 'versionType': 'semver'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/intel/iwlwifi/mld/agg.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers Three BA session handlers use ffs(ba_data->sta_mask) - 1 to derive a station ID without checking that sta_mask is non-zero. When sta_mask is zero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing an out-of-bounds access on fw_id_to_link_sta[]. Add WARN_ON_ONCE(!ba_data->sta_mask) guards before each ffs() call, consistent with the existing check in iwl_mld_ampdu_rx_start().
    Added Reference https://git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103b
    Added Reference https://git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2
    Added Reference https://git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact