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

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.

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。

CVSS 7.8 · High EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1055.001 · Dynamic-link Library Injection

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 592903cdcbf606a838056bae6d03fc557806c914< 4df1a45819e50993cb351682a6ae8e7ed2d233a0 affected
592903cdcbf606a838056bae6d03fc557806c914< 4f8d5812337871227bb2c98669a87c306a2f86ef affected
592903cdcbf606a838056bae6d03fc557806c914< 5c48fdc4b4623533d86e279f51531a7ba212eb87 affected
592903cdcbf606a838056bae6d03fc557806c914< 3f89b61dd504c5b6711de9759e053b082f9abf12 affected
592903cdcbf606a838056bae6d03fc557806c914< bb190628fe5f2a73ba762a9972ba16c5e895f73e affected
592903cdcbf606a838056bae6d03fc557806c914< c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae affected
2.6.31 affected
< 2.6.31 unaffected
… +6 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 592903cdcbf606a838056bae6d03fc557806c914 ~ 4df1a45819e50993cb351682a6ae8e7ed2d233a0 -
Linux Linux 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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Patches & Fixes for CVE-2026-23271 (6)

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

CVE-2026-23278 7.8 HIGH netfilter: nf_tables: always walk all pending catchall elements
CVE-2026-23275 7.8 HIGH io_uring: ensure ctx->rings is stable for task work flags manipulation
CVE-2026-23274 7.8 HIGH netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels
CVE-2026-23273 7.8 HIGH macvlan: observe an RCU grace period in macvlan_common_newlink() error path
CVE-2026-23272 7.8 HIGH netfilter: nf_tables: unconditionally bump set->nelems before insertion
CVE-2026-23276 net: add xmit recursion limit to tunnel xmit functions
CVE-2026-23277 net/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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