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CVE-2026-98064— bpf: Fix NULL-ptr-deref when showing a void BTF type

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： BPF：修复在显示 void 类型的 BTF（BPF 类型格式）时出现的空指针解引用问题 函数会先解析修饰符，然后无条件调用 。对于 void 类型（type_id 为 0，BTF_KIND_UNKN）， 数组中没有对应的条目，因此 为 NULL。 “const void”（修饰符解析后为 void）不能作为映射（map）的键或值——因为 void 类型没有大小， 会拒绝它，所以映射转储路径不会遇到这种情况。但是， 直接从 BPF 程序获取 type_id，如果从 vmli

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c4d0bfb45068d853a478b9067a95969b1886a30f< cf528f2d7a0a54f2a3c6d439cfa3c8d7dfe90d8d affected
c4d0bfb45068d853a478b9067a95969b1886a30f< adb15557a641cb8a31f83e5f62bd12042b138c7b affected
c4d0bfb45068d853a478b9067a95969b1886a30f< 62b00074b58ccf43f61f70f2cfcac80937b530c6 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< 86d86f9fcf62dd3654090fbf3cf7ae5f42aa0706 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< 717abdfd1d559d01fdd102023f0a990fb0437240 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< 98f1cb95221332139acf514350ae2cae3b8656c5 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< 5324f4e75ff6e9c2ca2e267c5f34f0937f9d0ac9 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< 4ea508b9ebd78bce7f212166d2e2cba66b875f08 affected
… +10 more rows
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I. Basic Information for CVE-2026-98064

Vulnerability Information
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Vulnerability Title
bpf: Fix NULL-ptr-deref when showing a void BTF type
Source: CVE Program / CVE List V5
Vulnerability Description
In 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c4d0bfb45068d853a478b9067a95969b1886a30f ~ cf528f2d7a0a54f2a3c6d439cfa3c8d7dfe90d8d -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-98064

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III. Intelligence Information for CVE-2026-98064

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Patches & Fixes for CVE-2026-98064 (8)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97937 7.8 HIGH ftrace: fork: Initialize function graph state before copy_exec_state()
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98064

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