llc: reserve device headroom for allocated frames
CVE-2026-98526 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98526, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.
In the Linux kernel, the following vulnerability has been resolved: llc: reserve device headroom for allocated frames llc_alloc_frame() reserves link-layer headroom using the device type. This is insufficient for stacked Ethernet devices such as VLAN devices, where vlan_dev_hard_header() pushes a VLAN header before the lower device's Ethernet header. An LLC response on such a device can therefore underflow skb headroom in eth_header(). Use LL_RESERVED_SPACE() to account for the device's actual required headroom while preserving the existing LLC device-type check.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 6.1.190-1 | DEBIAN-CVE-2026-98526 | Oct 19, 2026 |
| linux · Debian 13.5 (trixie) | 6.12.113-1 | DEBIAN-CVE-2026-98526 | Oct 19, 2026 |
| linux · Debian 14 | 7.2.9-1 | DEBIAN-CVE-2026-98526 | Oct 19, 2026 |
| linux-6.12 · Debian 12.15 (bookworm) | 6.12.113-1~deb12u1 | DEBIAN-CVE-2026-98526 | Oct 19, 2026 |
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