CVE-2026-63864: linux
CVSS: 8.4v3.1HighAwaiting analysis
AliasesUBUNTU-CVE-2026-63864DEBIAN-CVE-2026-63864
Published 19-07-2026Last modified 05-08-2026
Vulnerability summary
CVE-2026-63864 is a high (CVSS 8.4) vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7% of scored vulnerabilities.
CVSS score
8.4/10
010
High · v3.1 (CVE.org)EPSS score
0.18%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 8 · Related 8Timeline
- 19-07-2026PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Propagate error from visit_tailcall_insn Commit e40f5a6bf88a ("bpf: correct stack liveness for tail calls") added visit_tailcall_insn() but did not check its return value.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 8.4Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated8.4HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.4HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.4HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
+0.04 pp
From 0.14% on 19-09-2026
19-09-202619-10-2026
EPSS score0.18%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu111 products
- linux< 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 7.0.10-1
Linux1 product
- linux≥ e40f5a6bf88a781d5f81bc6b8aab9ac31d8c98dd, < 945816e63c8677cf4bfde963a0774432ce8afc85 | ≥ e40f5a6bf88a781d5f81bc6b8aab9ac31d8c98dd, < 6bd96e40f31dde8f8cd79772b4df0f171cf8a915 | 6.19
3 vendors · 113 products
