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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.

PUBLISHED Reserved 2026-03-09 | Published 2026-05-01 | Updated 2026-05-03 | Assigner Linux




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Product status

Default status
unaffected

c5c77ba18ea66aa05441c71e38473efb787705a4 (git) before 34a23fd9ddd683a03c7e8cc0ceded3e59e354b99
affected

c5c77ba18ea66aa05441c71e38473efb787705a4 (git) before 549f02d8ec94d39092ab6d9b103d0d6783a4b024
affected

c5c77ba18ea66aa05441c71e38473efb787705a4 (git) before bfbddeadd4779651403035ee177ae2f22f9f5521
affected

c5c77ba18ea66aa05441c71e38473efb787705a4 (git) before 9907ac9b9a18b92fc34b9e4cb9e10f208dc1d3f7
affected

c5c77ba18ea66aa05441c71e38473efb787705a4 (git) before c97b2a00059608592ad0d86fbb813a4f8cf9464b
affected

c5c77ba18ea66aa05441c71e38473efb787705a4 (git) before d8388614de613c28eeb659c10115060a83739924
affected

c5c77ba18ea66aa05441c71e38473efb787705a4 (git) before 0c7f21d8bd2f93998b72b7a7f93152336aeca4dd
affected

c5c77ba18ea66aa05441c71e38473efb787705a4 (git) before d049e56b1739101d1c4d81deedb269c52a8dbba0
affected

Default status
affected

4.2
affected

Any version before 4.2
unaffected

5.10.253 (semver)
unaffected

5.15.203 (semver)
unaffected

6.1.168 (semver)
unaffected

6.6.134 (semver)
unaffected

6.12.81 (semver)
unaffected

6.18.22 (semver)
unaffected

6.19.12 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/34a23fd9ddd683a03c7e8cc0ceded3e59e354b99

git.kernel.org/...c/549f02d8ec94d39092ab6d9b103d0d6783a4b024

git.kernel.org/...c/bfbddeadd4779651403035ee177ae2f22f9f5521

git.kernel.org/...c/9907ac9b9a18b92fc34b9e4cb9e10f208dc1d3f7

git.kernel.org/...c/c97b2a00059608592ad0d86fbb813a4f8cf9464b

git.kernel.org/...c/d8388614de613c28eeb659c10115060a83739924

git.kernel.org/...c/0c7f21d8bd2f93998b72b7a7f93152336aeca4dd

git.kernel.org/...c/d049e56b1739101d1c4d81deedb269c52a8dbba0

cve.org (CVE-2026-31780)

nvd.nist.gov (CVE-2026-31780)

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