CVE-2026-98063

CVE CVE-2026-98063EUVD EUVD-2026-86716Published 2026-09-25T10:24:07.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix NULL-ptr-deref in btf_var_show() btf_var_show() calls btf_type_id_resolve() unconditionally, which dereferences btf->resolved_ids. That is NULL for a base BTF - e.g. the vmlinux BTF that bpf_snprintf_btf() renders against - since base BTF is not resolved during parsing. btf_modifier_show() guards this with 'if (btf->resolved_ids)', but btf_var_show() does not. A BPF program that passes the type_id of a BTF_KIND_VAR from the vmlinux BTF to bpf_snprintf_btf() thus NULL-derefs: KASAN: probably user-memory-access in range [0x46638-0x4663f] RIP: 0010:btf_var_show (kernel/bpf/btf.c:2929) Call Trace: <TASK> btf_type_show (kernel/bpf/btf.c:8259) btf_type_snprintf_show (kernel/bpf/btf.c:8329) bpf_snprintf_btf (kernel/trace/bpf_trace.c:1047) bpf_prog_test_run_raw_tp (net/bpf/test_run.c:829) __sys_bpf (kernel/bpf/syscall.c:4804) do_syscall_64 (arch/x86/entry/syscall_64.c:84) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) </TASK> Resolve the var's type directly with btf_type_skip_modifiers() when resolved_ids is NULL, mirroring btf_modifier_show().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 5.10; c4d0bfb45068d853a478b9067a95969b1886a30f <ca086264e98108b44fdf53971033811a48defe2b; c4d0bfb45068d853a478b9067a95969b1886a30f <ea383b3ea56979ce54c8aa88e6ec67164986c401; c4d0bfb45068d853a478b9067a95969b1886a30f <e472ae0d97865e2021ee668a13eab64013aebf23; patch: 7.2.7; c4d0bfb45068d853a478b9067a95969b1886a30f <5403a383f52fc0905703b488f7c3db4b2447dc58; patch: 0; patch: 6.12.111; patch: 7.3-rc2; patch: 6.18.53

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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