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CVE-2026-98007— bpf: Reject non-scalar bpf_loop iteration counts

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：拒绝非标量类型的 bpf_loop 迭代计数 将其 参数声明为 （任意类型）。特权程序可能向此类参数传递指针值，因此 允许带有指针值的寄存器 R1 进入针对特定辅助函数的检查逻辑。 自提交 （“BPF：跟踪 bpf_loop 回调的最大迭代次数”）以来，验证器会将 R1 标记为精确（precise）并读取其上界，以限制回调模拟。精确性回溯（precision backtracking）仅接受标量寄存器，因此若传递指针而非标量，则会触发“回溯误用”（backtrack

AI Predicted 7.8 Difficulty: Hard EPSS 0.17% · P6

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux bfc5c19b4b48840627af0d0f1c8f4461b276e508< 2ff38b3552af53238aee6c877ae64cc798d46fce affected
bb124da69c47dd98d69361ec13244ece50bec63e< 656d40d1ca228ee21a9b3280432479fc9eae75ab affected
bb124da69c47dd98d69361ec13244ece50bec63e< e2e1161e03fecff6d2229a81b024337144bfcd97 affected
bb124da69c47dd98d69361ec13244ece50bec63e< f8ae8275c721334ee50fafdd986fb83294eb941a affected
bb124da69c47dd98d69361ec13244ece50bec63e< c3fd8e5fd100f122bad503bdc0e9277219533253 affected
6.6.15< 6.6.158 affected
6.7 affected
< 6.7 unaffected
… +5 more rows
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I. Basic Information for CVE-2026-98007

Vulnerability Information
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Vulnerability Title
bpf: Reject non-scalar bpf_loop iteration counts
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject non-scalar bpf_loop iteration counts bpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged programs may pass pointer values to such arguments, so check_func_arg() lets a pointer-valued R1 reach the helper-specific checks. Since commit bb124da69c47 ("bpf: keep track of max number of bpf_loop callback iterations"), the verifier marks R1 precise and reads its upper bound to limit callback simulation. Precision backtracking only accepts scalar registers, so passing a pointer instead triggers the "backtracking misuse" verifier warning. Kernels with panic_on_warn enabled subsequently panic. Introduce ARG_SCALAR for helper arguments that only accept scalar values and use it for bpf_loop() nr_loops. Generic helper argument validation then rejects pointers before loop inlining and precision processing.
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 bfc5c19b4b48840627af0d0f1c8f4461b276e508 ~ 2ff38b3552af53238aee6c877ae64cc798d46fce -
Linux Linux 6.7 -

II. Public POCs for CVE-2026-98007

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III. Intelligence Information for CVE-2026-98007

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Patches & Fixes for CVE-2026-98007 (5)

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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