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CVE-2026-74753— perf: Reject exited events as group leaders

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，以下漏洞已得到修复： perf：拒绝处于 EXIT 状态的事件作为事件组组长 会将“执行时移除”（remove-on-exec）的事件设置为 EXIT 状态，并解除其与事件组的关联。然而，该事件的文件描述符（file descriptor）可能仍然保持打开状态，而当前的 在早期验证阶段仅拒绝 REVOKED 和 DEAD 状态的事件，因此可能将处于 EXIT 状态的事件错误地接受为事件组组长（group leader）。 这导致新的子事件（sibling）可能被链接到这个已解除关联的组长上。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 2 AI

T1015 T1082 · System Information Discovery

Affected Version Matrix 9

VendorProduct Version RangeStatus
Linux Linux a2d5d3ee7b6e3953114726b1521e62123ab5b043< 7a03413f31c196ab3894f988cdce0bb47b4fec42 affected
06ccef0434e98058ddae7bcebc901f93d22b7653< 7ce010275c531475f9d6e7efb11b9e522c74ed2e affected
037a3c43edfb597665dd34457cd22b14692f2ba3< fa091f46c3833fb22384f10eade2b4e1e1d0b278 affected
4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2 affected
39358e856fb89e62e3c8d7389a2dc4ec33dbe90e affected
6.6.145< 6.7 affected
6.12.96< 6.13 affected
6.18.39< 6.18.46 affected
… +1 more rows
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I. Basic Information for CVE-2026-74753

Vulnerability Information
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Vulnerability Title
perf: Reject exited events as group leaders
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: perf: Reject exited events as group leaders perf_event_remove_on_exec() sets remove-on-exec events to the EXIT state and detaches their group relationships. The event's file descriptor can remain open, however, and perf_event_open() currently accepts that event as a group leader because its early validation rejects only REVOKED and DEAD events. A new sibling can consequently be linked to the detached leader. When the leader is closed, perf_group_detach() observes that its PERF_ATTACH_GROUP bit is already clear and skips the new sibling. The sibling then retains a group_leader pointer to the freed event. Reject group leaders in the EXIT state. Perform the check while holding the shared context mutex so that an exec in the target task cannot detach the leader between validation and group attachment. [peterz: make the earlier test fully consistent]
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a2d5d3ee7b6e3953114726b1521e62123ab5b043 ~ 7a03413f31c196ab3894f988cdce0bb47b4fec42 -
Linux Linux 6.18.39 ~ 6.18.46 -

II. Public POCs for CVE-2026-74753

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III. Intelligence Information for CVE-2026-74753

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Patches & Fixes for CVE-2026-74753 (2)

Other References for CVE-2026-74753 (1)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits
CVE-2026-80553 8.8 HIGH s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74753

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