CVE-2026-63868: linux

CVSS: UnknownAwaiting analysis
AliasesUBUNTU-CVE-2026-63868DEBIAN-CVE-2026-63868
Published 19-07-2026Last modified 19-07-2026
Open JSON

Vulnerability summary

CVE-2026-63868 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 35 · Related 34
MGASA-2026-0312OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1SUSE-SU-2026:23528-1SUSE-SU-2026:23529-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu168 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.13-1
Linux1 product
  • linux≥ eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 29f28172afb2ae7b31e9bf3e978396f20b381688 | ≥ eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 973cf7c433d27f4d9556d0b7c332543be7ed7a6e | ≥ eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < d8dcd14aa886b8effd83022c550669f4f262854b | ≥ eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 74e02121be1dcc0efcd56ebdf0171d6129105659 | ≥ eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < d4c86ea09ae3e63ee5aa86e941fcc38e0e39874a | ≥ eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 04e22fefac1af3e32f245e9045382348773b5d59 | ≥ eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < a11f1a671b1361f0f1278dc0041374f2730df73f | ≥ eca9ebac651f774d8b10fce7c5d173c3c3d3394f, < 16e408e607a94b646fb14a2a98422c6877ae4b3c | 2.6.27

3 vendors · 170 products

References

34 links
Show all 34 references