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CVE-2026-98526

Unknown

Last modified

CVE-2026-98526 is a vulnerability of currently unknown severity. 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..

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= bf9ae5386bca8836c16e69ab8fdbe46767d7452a, < 018020f5a48cc86fdd6dc2d380f6c70443ae7639; >= bf9ae5386bca8836c16e69ab8fdbe46767d7452a, < 3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1; >= bf9ae5386bca8836c16e69ab8fdbe46767d7452a, < 7c38524b2b2456bd33cb360420da6cbf9cad1b33; >= bf9ae5386bca8836c16e69ab8fdbe46767d7452a, < 1937222c2511ac91377d39f28106c34734f5f8c6; >= bf9ae5386bca8836c16e69ab8fdbe46767d7452a, < 16ceac2daa89dd16917bc488ab05b9dd6961a603; >= bf9ae5386bca8836c16e69ab8fdbe46767d7452a, < e06f8b6e27cc616d3c587e9784c4a033eb310a16; >= bf9ae5386bca8836c16e69ab8fdbe46767d7452a, < 3361c93e417384ebf28003e0fb6d5304653d3b05; >= bf9ae5386bca8836c16e69ab8fdbe46767d7452a, < 72b5b9a28b996e09b8b5b944370c79851bb68f52
LinuxLinux2.6.34

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98526?
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.
How severe is CVE-2026-98526?
Severity scoring for CVE-2026-98526 is pending analysis.
How do I fix CVE-2026-98526?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST