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CVE-2026-97905— cpufreq: zero-initialize policy cpumask before sysfs publication

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： cpufreq：在通过 sysfs 暴露策略前，对策略的 cpumask 进行零初始化 使用 分配 ，即未使用 标志；而相关的 和 掩码则进行了零初始化。当启用 时，该掩码是一个独立的 分配，因此其位图中可能包含 slab 分配器残留的垃圾数据： 这导致存在一个时间窗口：sysfs 属性已可访问，但 仍包含垃圾数据。 / 操作通过 （即检查 是否为零）进行门控；如果位图非零，则会导致在策略尚未初始化时就执行属性回调函数。 修复方法是：对 使用 进行零初始化分配。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2fc3384dc75bf7333384c7a16d12c796f61c3f56< e13370c5b549712f49f80234df249303381c53b4 affected
2fc3384dc75bf7333384c7a16d12c796f61c3f56< e807920031ca32b668f9e7a1efbd21858f03d64b affected
2fc3384dc75bf7333384c7a16d12c796f61c3f56< ca52482508b3ac9febe74ca4f732647d394727b8 affected
2fc3384dc75bf7333384c7a16d12c796f61c3f56< 06f273d29e5e0fe5c775a65c563fbeed8cd94c7a affected
2fc3384dc75bf7333384c7a16d12c796f61c3f56< 0de2f3918fbbbb767e7e716178194b66560dd12a affected
2fc3384dc75bf7333384c7a16d12c796f61c3f56< 6e166b9281dec98aed19213a84235250e5fdb081 affected
2fc3384dc75bf7333384c7a16d12c796f61c3f56< bbc0472d2270bf732142ca71579d6ede636174ed affected
2fc3384dc75bf7333384c7a16d12c796f61c3f56< 54d37bcf2f497140b9207968557ddb484058e749 affected
… +10 more rows
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I. Basic Information for CVE-2026-97905

Vulnerability Information
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Vulnerability Title
cpufreq: zero-initialize policy cpumask before sysfs publication
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cpufreq: zero-initialize policy cpumask before sysfs publication cpufreq_policy_alloc() allocates policy->cpus with alloc_cpumask_var(), i.e. without __GFP_ZERO, unlike the sibling related_cpus and real_cpus masks. With CONFIG_CPUMASK_OFFSTACK=y the mask is a separate kmalloc_node() allocation, so its bitmap holds whatever the slab allocator left behind: cpufreq_online() cpufreq_policy_alloc() alloc_cpumask_var(&policy->cpus) /* bitmap is uninitialized */ kobject_init_and_add() /* policy%u/ appears in sysfs */ cpufreq_policy_online() cpumask_copy(policy->cpus, cpumask_of(cpu)) /* first valid value */ This leaves a window in which the sysfs attributes are already reachable while policy->cpus is still garbage. show()/store() gate on policy_is_inactive(), i.e. cpumask_empty(policy->cpus), so a non-zero bitmap makes them run the attribute callbacks on a policy that is not initialized yet. Fix this by using zalloc_cpumask_var() for policy->cpus.
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 2fc3384dc75bf7333384c7a16d12c796f61c3f56 ~ e13370c5b549712f49f80234df249303381c53b4 -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-97905

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III. Intelligence Information for CVE-2026-97905

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Patches & Fixes for CVE-2026-97905 (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-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
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-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
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-2026-97905

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