staging: rtl8723bs: fix OOB write in HT_caps_handler()
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB write in HT_caps_handler() HT_caps_handler() iterates pIE->length bytes and writes into HT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct HT_caps_element). Because pIE->length is a raw u8 from an over-the-air 802.11 AssocResponse frame and is never validated, a malicious AP can set it up to 255, causing up to 229 bytes of out-of-bounds writes into adjacent fields of struct mlme_ext_info. Truncate the iteration count to the size of HT_caps.u.HT_cap using umin() so that data from a longer-than-expected IE is silently ignored rather than written out of bounds, preserving interoperability with APs that pad the element. An early return on oversized IEs was considered but rejected: it would bypass the pmlmeinfo->HT_caps_enable = 1 assignment that precedes the loop, silently disabling HT mode for APs that append extra bytes to the HT Capabilities IE.
CVE-2026-64440
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-2026-64440
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": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
"lessThan": "37f642d47c3648a707df3ceb092eee1adffbfd28",
"versionType": "git"
},
{
"status": "affected",
"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
"lessThan": "8c872b47c7fc32e95e0da1db7512388794adcd69",
"versionType": "git"
},
{
"status": "affected",
"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
"lessThan": "bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a",
"versionType": "git"
},
{
"status": "affected",
"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
"lessThan": "918537a0fbed85aab61fa28ad75e6279070610c9",
"versionType": "git"
},
{
"status": "affected",
"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
"lessThan": "6f91621fc45025ad3c0be796b70e6e4cee22fc69",
"versionType": "git"
},
{
"status": "affected",
"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
"lessThan": "225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d",
"versionType": "git"
},
{
"status": "affected",
"version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
"lessThan": "f8001e1a516ba3b495728c65b61f799cbfad6bd0",
"versionType": "git"
}
],
"programFiles": [
"drivers/staging/rtl8723bs/core/rtw_wlan_util.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/staging/rtl8723bs/core/rtw_wlan_util.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64440
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41045 · Revision 1
- Added to Heist Feed
- Publisher date