bpf: Fix NULL-ptr-deref when showing a void BTF type

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98064
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:35 UTC
Updated2026-10-19 10:18:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix NULL-ptr-deref when showing a void BTF type btf_modifier_show() resolves the modifier and then calls btf_type_ops(t)->show() unconditionally. For the void type (type_id 0, BTF_KIND_UNKN) kind_ops[] has no entry, so ->show is NULL. A "const void" (a modifier resolving to void) cannot be a map key or value - map_check_btf() rejects it because void has no size - so the map dump path does not reach it. But bpf_snprintf_btf() takes a type_id straight from the BPF program, and passing such a "const void" from the vmlinux BTF NULL-derefs: KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] RIP: 0010:btf_modifier_show (kernel/bpf/btf.c:2914) Call Trace: <TASK> btf_type_show (kernel/bpf/btf.c:8251) btf_type_snprintf_show (kernel/bpf/btf.c:8321) 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:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) </TASK> Fall back to btf_df_show() when the resolved type has no show op; it emits the "<unsupported kind:N>" placeholder already used for kinds like FWD and FUNC. bpf_snprintf_btf() then returns the length as usual.

Risk And Classification

EPSS: 0.001760000 probability, percentile 0.065290000 (date 2026-10-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c4d0bfb45068d853a478b9067a95969b1886a30f cf528f2d7a0a54f2a3c6d439cfa3c8d7dfe90d8d git Not specified
CNA Linux Linux affected c4d0bfb45068d853a478b9067a95969b1886a30f adb15557a641cb8a31f83e5f62bd12042b138c7b git Not specified
CNA Linux Linux affected c4d0bfb45068d853a478b9067a95969b1886a30f 62b00074b58ccf43f61f70f2cfcac80937b530c6 git Not specified
CNA Linux Linux affected c4d0bfb45068d853a478b9067a95969b1886a30f 86d86f9fcf62dd3654090fbf3cf7ae5f42aa0706 git Not specified
CNA Linux Linux affected c4d0bfb45068d853a478b9067a95969b1886a30f 717abdfd1d559d01fdd102023f0a990fb0437240 git Not specified
CNA Linux Linux affected c4d0bfb45068d853a478b9067a95969b1886a30f 98f1cb95221332139acf514350ae2cae3b8656c5 git Not specified
CNA Linux Linux affected c4d0bfb45068d853a478b9067a95969b1886a30f 5324f4e75ff6e9c2ca2e267c5f34f0937f9d0ac9 git Not specified
CNA Linux Linux affected c4d0bfb45068d853a478b9067a95969b1886a30f 4ea508b9ebd78bce7f212166d2e2cba66b875f08 git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/62b00074b58ccf43f61f70f2cfcac80937b530c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/86d86f9fcf62dd3654090fbf3cf7ae5f42aa0706 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf528f2d7a0a54f2a3c6d439cfa3c8d7dfe90d8d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4ea508b9ebd78bce7f212166d2e2cba66b875f08 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/98f1cb95221332139acf514350ae2cae3b8656c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5324f4e75ff6e9c2ca2e267c5f34f0937f9d0ac9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/717abdfd1d559d01fdd102023f0a990fb0437240 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/adb15557a641cb8a31f83e5f62bd12042b138c7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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