CVE-2026-31780
wifi: wilc1000: fix u8 overflow in SSID scan buffer size calculation
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: wilc1000: fix u8 overflow in SSID scan buffer size calculation The variable valuesize is declared as u8 but accumulates the total length of all SSIDs to scan. Each SSID contributes up to 33 bytes (IEEE80211_MAX_SSID_LEN + 1), and with WILC_MAX_NUM_PROBED_SSID (10) SSIDs the total can reach 330, which wraps around to 74 when stored in a u8. This causes kmalloc to allocate only 75 bytes while the subsequent memcpy writes up to 331 bytes into the buffer, resulting in a 256-byte heap buffer overflow. Widen valuesize from u8 to u32 to accommodate the full range.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
4.2
References 8
git.kernel.org
- stable/c/34a23fd9ddd683a03c7e8cc0ceded3e59e354b99
- stable/c/549f02d8ec94d39092ab6d9b103d0d6783a4b024
- stable/c/bfbddeadd4779651403035ee177ae2f22f9f5521
- stable/c/9907ac9b9a18b92fc34b9e4cb9e10f208dc1d3f7
- stable/c/c97b2a00059608592ad0d86fbb813a4f8cf9464b
- stable/c/d8388614de613c28eeb659c10115060a83739924
- stable/c/0c7f21d8bd2f93998b72b7a7f93152336aeca4dd
- stable/c/d049e56b1739101d1c4d81deedb269c52a8dbba0