CVE-2026-63864 Details
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.
A vulnerability in the Linux kernel's BPF (Berkeley Packet Filter) subsystem has been addressed. The issue arose because a recent commit added a function to handle tail calls in BPF but failed to check for errors from that function. This oversight could lead to improper handling of stack liveness during BPF tail calls, potentially causing issues in BPF program execution.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the latest kernel version can be found on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/6bd96e40f31dde8f8cd79772b4df0f171cf8a915 | kernel.org | |
| https://git.kernel.org/stable/c/945816e63c8677cf4bfde963a0774432ce8afc85 | kernel.org |
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |