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CVE-2026-97587— perf: RISC-V: store available counter mask as bitmap

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： perf：RISC-V：将可用计数器掩码存储为位图（bitmap） 原先的可用计数器掩码被定义为一个 类型，但迭代操作使用了 ，其值为 64。在 RV32（32位 RISC-V 架构）环境下，这会读取超出对象边界的数据。此外，在索引 32 及以上位置填充 位也是错误的。 改用 及 /位图辅助函数。在检查事件、分配索引以及停止所有计数器时，遍历位图的每个字（word），并将其映射到 。将计数器基数设置为 。通过一个小助手函数共享 ecall 调用，避免重复处理 32 位参数拆

AI Predicted 5.5 Difficulty: Moderate EPSS 0.20% · P9

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux e9991434596f5373dfd75857b445eb92a9253c56< 143668c424772979a45118dc9cc9c2c13a35f41d affected
e9991434596f5373dfd75857b445eb92a9253c56< 9bec7beaed074bcae4181fde9ff9dfbe4e7b0957 affected
e9991434596f5373dfd75857b445eb92a9253c56< e5481db31f4654e9a1254d5d467d9b1ff2f8b1cb affected
e9991434596f5373dfd75857b445eb92a9253c56< 6809da6e9c08ccc9a09cb0a48c61471679274aaa affected
5.18 affected
< 5.18 unaffected
6.12.111≤ 6.12.* unaffected
6.18.53≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-97587

Vulnerability Information
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Vulnerability Title
perf: RISC-V: store available counter mask as bitmap
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: perf: RISC-V: store available counter mask as bitmap The available-counter mask was a single unsigned long, but iteration uses RISCV_MAX_COUNTERS, which is 64. On RV32 that reads past the object. Filling with an unsigned-long bit at index 32 and above is also wrong. Use DECLARE_BITMAP and set_bit/bitmap helpers. Walk each bitmap word into CFG_MATCH when checking events, when allocating an index, and when stopping all counters. Set the counter base to i times BITS_PER_LONG. Share the CFG_MATCH ecall through a small helper so the 32-bit argument split is not duplicated. On qemu-system-riscv32 the probe bitmap has bits above XLEN set, so the first word alone is not enough. [pjw@kernel.org: updated to apply; fixed checkpatch.pl issues]
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 e9991434596f5373dfd75857b445eb92a9253c56 ~ 143668c424772979a45118dc9cc9c2c13a35f41d -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-97587

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III. Intelligence Information for CVE-2026-97587

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Patches & Fixes for CVE-2026-97587 (4)

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-2026-97957 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-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
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-2026-97573 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-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97903 7.8 HIGH exit: hold a reference to thread_pid across proc_flush_pid
CVE-2026-97548 7.8 HIGH xfs: fix the rtrmap and rtrefcount _maxlevels_ondisk functions
CVE-2026-97611 7.8 HIGH net: openvswitch: fix use-after-free of the flow table mask array
CVE-2026-97612 7.8 HIGH net: mpls: clear inner_protocol when the last label is popped
CVE-2026-98073 7.8 HIGH net: Remove conflicting altnames for dying netns in __dev_change_net_namespace().
CVE-2026-97602 7.8 HIGH inet: frags: invalidate queues before flushing them
CVE-2026-97577 7.8 HIGH media: verisilicon: rockchip: reject AV1 frames exceeding the tile capacity

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-2026-97587

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