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CVE-2026-98063— bpf: Fix NULL-ptr-deref in btf_var_show()

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，已解决以下漏洞： bpf: 修复 btf_var_show() 中的空指针解引用漏洞 函数无条件地调用了 ，该函数会解引用 指针。然而，对于基础 BTF（例如 所针对的 vmlinux BTF）， 为 NULL，因为基础 BTF 在解析阶段并未进行 ID 解析。虽然 函数通过 进行了保护，但 却缺少这一检查。 因此，若一个 BPF 程序将从 vmlinux BTF 中获取的 BTF_KIND_VAR 类型的 type_id 传递给 ，就会触发空指针解引用： 修复方法：当 为 NULL 时，直

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c4d0bfb45068d853a478b9067a95969b1886a30f< 5756450c9a702da0efb4a993d0a6766b965736f3 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< e83fcbe3b5d4a1ffb0569bb7c280358065c6017a affected
c4d0bfb45068d853a478b9067a95969b1886a30f< e0d6a06171633d3ee3f7a39b57e5c845fb2b79f2 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< aec0a9c1579eb9edf534960be592d09481bd7ac3 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< e472ae0d97865e2021ee668a13eab64013aebf23 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< ca086264e98108b44fdf53971033811a48defe2b affected
c4d0bfb45068d853a478b9067a95969b1886a30f< ea383b3ea56979ce54c8aa88e6ec67164986c401 affected
c4d0bfb45068d853a478b9067a95969b1886a30f< 5403a383f52fc0905703b488f7c3db4b2447dc58 affected
… +10 more rows
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I. Basic Information for CVE-2026-98063

Vulnerability Information
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Vulnerability Title
bpf: Fix NULL-ptr-deref in btf_var_show()
Source: CVE Program / CVE List V5
Vulnerability 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().
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 ~ 5756450c9a702da0efb4a993d0a6766b965736f3 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-98063

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III. Intelligence Information for CVE-2026-98063

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Patches & Fixes for CVE-2026-98063 (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

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