CVE-2026-31780
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0c7f21d8bd2f93998b72b7a7f93152336aeca4ddPatch
- https://git.kernel.org/stable/c/34a23fd9ddd683a03c7e8cc0ceded3e59e354b99Patch
- https://git.kernel.org/stable/c/549f02d8ec94d39092ab6d9b103d0d6783a4b024Patch
- https://git.kernel.org/stable/c/9907ac9b9a18b92fc34b9e4cb9e10f208dc1d3f7Patch
- https://git.kernel.org/stable/c/bfbddeadd4779651403035ee177ae2f22f9f5521Patch
- https://git.kernel.org/stable/c/c97b2a00059608592ad0d86fbb813a4f8cf9464bPatch
- https://git.kernel.org/stable/c/d049e56b1739101d1c4d81deedb269c52a8dbba0Patch
- https://git.kernel.org/stable/c/d8388614de613c28eeb659c10115060a83739924Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.