wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
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().
CVE-2026-64255
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64255
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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"
}
]- Related CVEs
- CVE-2026-64255
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40983 · Revision 1
- Added to Heist Feed
- Publisher date