7.8

CVE-2026-63954: linux

CVSS: 7.8v3.1HighAwaiting analysis
AliasesUBUNTU-CVE-2026-63954DEBIAN-CVE-2026-63954
Published 19-07-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-63954 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
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 20 · Related 20
USN-8593-1USN-8603-1USN-8618-1USN-8663-1USN-8664-1USN-8728-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: hpfs: fix a crash if hpfs_map_dnode_bitmap fails If hpfs_map_dnode_bitmap fails, the code would call hpfs_brelse4 on uninitialized quad buffer head, causing a crash.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 19-09-2026

19-09-202619-10-2026
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

Ubuntu167 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1009.9
  • 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 | < 7.0.12-1
Linux1 product
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 010b08084000ef018f1a8de5197087f3b91d8cfe | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d98d8562b3284b5a5c8eb67e71b794508e46e288 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1648a3c7f4e18f46a4881920133fc4f2494185a0 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7c58c55a2a16f7274772507bd1637be609351b4f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1d73a533760bc5abb83b3cc759133596f7bb708f | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0886c6f257fe3663f80218aa1919b0f3f21bf22c | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4f37bb30b57d6d403d02673074555bd3c3602bef | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 974820a59efde7c1a7e1260bcfe9bb81f833cc9f | 2.6.12

3 vendors · 169 products

References

33 links
Show all 33 references