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CVE-2026-23271— perf: Fix __perf_event_overflow() vs perf_remove_from_context() race

CVSS 7.8 · High EPSS 0.01% · P3
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I. Basic Information for CVE-2026-23271

Vulnerability Information
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Vulnerability Title
perf: Fix __perf_event_overflow() vs perf_remove_from_context() race
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: perf: Fix __perf_event_overflow() vs perf_remove_from_context() race Make sure that __perf_event_overflow() runs with IRQs disabled for all possible callchains. Specifically the software events can end up running it with only preemption disabled. This opens up a race vs perf_event_exit_event() and friends that will go and free various things the overflow path expects to be present, like the BPF program.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于__perf_event_overflow与perf_remove_from_context之间的竞争条件，可能导致释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 592903cdcbf606a838056bae6d03fc557806c914 ~ 4df1a45819e50993cb351682a6ae8e7ed2d233a0 -
LinuxLinux 2.6.31 -

II. Public POCs for CVE-2026-23271

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III. Intelligence Information for CVE-2026-23271

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Same Patch Batch · Linux · 2026-03-20 · 8 CVEs total

CVE-2026-232787.8 HIGHnetfilter: nf_tables: always walk all pending catchall elements
CVE-2026-232757.8 HIGHio_uring: ensure ctx->rings is stable for task work flags manipulation
CVE-2026-232747.8 HIGHnetfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels
CVE-2026-232737.8 HIGHmacvlan: observe an RCU grace period in macvlan_common_newlink() error path
CVE-2026-232727.8 HIGHnetfilter: nf_tables: unconditionally bump set->nelems before insertion
CVE-2026-23276net: add xmit recursion limit to tunnel xmit functions
CVE-2026-23277net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23271

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