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CVE-2026-63868

UnknownEPSS 0.17%

Last modified

CVE-2026-63868 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: net: garp: fix unsigned integer underflow in garp_pdu_parse_attr The receive-side GARP attribute parser computes dlen with reversed operands: dlen = sizeof(*ga) - ga->len; ga->len is the on-wire attribute length and includes the GARP attribute header. For normal attributes with data, ga->len is larger than sizeof(*ga), so the subtraction underflows in unsigned arithmetic. The resulting value is later passed to garp_attr_lookup(), whose length argument is u8. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: net: garp: fix unsigned integer underflow in garp_pdu_parse_attr The receive-side GARP attribute parser computes dlen with reversed operands: dlen = sizeof(*ga) - ga->len; ga->len is the on-wire attribute length and includes the GARP attribute header. For normal attributes with data, ga->len is larger than sizeof(*ga), so the subtraction underflows in unsigned arithmetic. The resulting value is later passed to garp_attr_lookup(), whose length argument is u8. After truncation, the parsed data length usually no longer matches the length stored for locally registered attributes, so received Join/Leave events are ignored. This breaks the GARP receive path for common attributes, such as GVRP VLAN registration attributes. Compute the data length as the attribute length minus the header length.

Metrics

EPSS Probability
0.17%

6.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 29f28172afb2ae7b31e9bf3e978396f20b381688; >= eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 973cf7c433d27f4d9556d0b7c332543be7ed7a6e; >= eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < d8dcd14aa886b8effd83022c550669f4f262854b; >= eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 74e02121be1dcc0efcd56ebdf0171d6129105659; >= eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < d4c86ea09ae3e63ee5aa86e941fcc38e0e39874a; >= eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 04e22fefac1af3e32f245e9045382348773b5d59; >= eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < a11f1a671b1361f0f1278dc0041374f2730df73f; >= eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 16e408e607a94b646fb14a2a98422c6877ae4b3c
LinuxLinux2.6.27

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-63868?
In the Linux kernel, the following vulnerability has been resolved: net: garp: fix unsigned integer underflow in garp_pdu_parse_attr The receive-side GARP attribute parser computes dlen with reversed operands: dlen = sizeof(*ga) - ga->len; ga->len is the on-wire attribute length and includes the GARP attribute header. For normal attributes with data, ga->len is larger than sizeof(*ga), so the subtraction underflows in unsigned arithmetic. The resulting value is later passed to garp_attr_lookup(), whose length argument is u8. After truncation, the parsed data length usually no longer matches the length stored for locally registered attributes, so received Join/Leave events are ignored. This breaks the GARP receive path for common attributes, such as GVRP VLAN registration attributes. Compute the data length as the attribute length minus the header length.
How severe is CVE-2026-63868?
Severity scoring for CVE-2026-63868 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-63868?
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