CVE-2026-98063bpf: Fix NULL-ptr-deref in btf_var_show()
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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().
Timeline
ID reserved
By Linux
Published
- 24 days later
· 24 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Undergoing Analysis.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected c4d0bfb45068d853a478b9067a95969b1886a30f – < 5756450c9a702da0efb4a993d0a6766b965736f3
- affected c4d0bfb45068d853a478b9067a95969b1886a30f – < e83fcbe3b5d4a1ffb0569bb7c280358065c6017a
- affected c4d0bfb45068d853a478b9067a95969b1886a30f – < e0d6a06171633d3ee3f7a39b57e5c845fb2b79f2
- affected c4d0bfb45068d853a478b9067a95969b1886a30f – < aec0a9c1579eb9edf534960be592d09481bd7ac3
- affected c4d0bfb45068d853a478b9067a95969b1886a30f – < e472ae0d97865e2021ee668a13eab64013aebf23
- affected c4d0bfb45068d853a478b9067a95969b1886a30f – < ca086264e98108b44fdf53971033811a48defe2b
- affected c4d0bfb45068d853a478b9067a95969b1886a30f – < ea383b3ea56979ce54c8aa88e6ec67164986c401
- affected c4d0bfb45068d853a478b9067a95969b1886a30f – < 5403a383f52fc0905703b488f7c3db4b2447dc58
- affected 5.10
- unaffected < 5.10
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2.7 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/5756450c9a702da0efb4a993d0a6766b965736f3 (opens in a new tab)
- https://git.kernel.org/stable/c/e83fcbe3b5d4a1ffb0569bb7c280358065c6017a (opens in a new tab)
- https://git.kernel.org/stable/c/e0d6a06171633d3ee3f7a39b57e5c845fb2b79f2 (opens in a new tab)
- https://git.kernel.org/stable/c/aec0a9c1579eb9edf534960be592d09481bd7ac3 (opens in a new tab)
- https://git.kernel.org/stable/c/e472ae0d97865e2021ee668a13eab64013aebf23 (opens in a new tab)
- https://git.kernel.org/stable/c/ca086264e98108b44fdf53971033811a48defe2b (opens in a new tab)
- https://git.kernel.org/stable/c/ea383b3ea56979ce54c8aa88e6ec67164986c401 (opens in a new tab)
- https://git.kernel.org/stable/c/5403a383f52fc0905703b488f7c3db4b2447dc58 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86716 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-98063)Record last updated .