CVE-2026-64440staging: rtl8723bs: fix OOB write in HT_caps_handler()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 37f642d47c3648a707df3ceb092eee1adffbfd28; 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 8c872b47c7fc32e95e0da1db7512388794adcd69; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b before bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b before 918537a0fbed85aab61fa28ad75e6279070610c9; 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 6f91621fc45025ad3c0be796b70e6e4cee22fc69; 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b before f8001e1a516ba3b495728c65b61f799cbfad6bd0 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.12 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 7.2; 7.2 | NVD |
References
- https://git.kernel.org/stable/c/37f642d47c3648a707df3ceb092eee1adffbfd28patch
- https://git.kernel.org/stable/c/8c872b47c7fc32e95e0da1db7512388794adcd69patch
- https://git.kernel.org/stable/c/bb3b942da4123b55d1cacf19d1a7d5ba15dbf83apatch
- https://git.kernel.org/stable/c/918537a0fbed85aab61fa28ad75e6279070610c9patch
- https://git.kernel.org/stable/c/6f91621fc45025ad3c0be796b70e6e4cee22fc69patch
- https://git.kernel.org/stable/c/225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31dpatch
- https://git.kernel.org/stable/c/f8001e1a516ba3b495728c65b61f799cbfad6bd0patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.