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CVE-2026-74731— sched_ext: Skip sub-disable teardown for never-linked sub-schedulers

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： sched_ext：对从未链接的次级调度器跳过子级禁用清理流程 次级调度器的启用可能在 将其链接到调度层级结构之前失败，例如当父级调度器已被禁用时。在这种情况下，清理代码仍会执行完整的 流程。 这会导致与根级禁用操作之间存在竞态条件： 是次级调度器禁用时的任务遍历与根级禁用时的所有任务清理之间唯一的同步 ordering 机制。而未被链接的次级调度器对该机制不可见。因此，根级的清理流程可能在从未链接的次级调度器的 操作与其任务遍历之间执行，导致所有任务被退出且无调度器接管。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.20% · P10

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 337ec00b1d9c676f637651c2cefddb8612b867ee< 6428093a4a986c38c9089b5eb32b56d914ef437a affected
337ec00b1d9c676f637651c2cefddb8612b867ee< 8c13364db9c9a43ed286f3a8d0fb9477b1adc43c affected
7.1 affected
< 7.1 unaffected
7.1.9≤ 7.1.* unaffected
7.2≤ * unaffected
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I. Basic Information for CVE-2026-74731

Vulnerability Information
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Vulnerability Title
sched_ext: Skip sub-disable teardown for never-linked sub-schedulers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Skip sub-disable teardown for never-linked sub-schedulers A sub-scheduler enable can fail before scx_link_sched() links the sched into the hierarchy, e.g. when the parent is already being disabled, and cleanup still runs the full scx_sub_disable(). That is racy against root disable: drain_descendants() is the only ordering between a sub's disable-time task walk and root disable's all-task teardown, and an unlinked sub is invisible to it. Root's teardown can thus run between the never-linked sub's drain and its walk, exiting every task to no scheduler. The walk then trips the membership WARN and re-homes the exited tasks onto the dying hierarchy, a use-after-free. Skip the cgroup ownership reset and the task walk if @sch was never linked, indicated by the empty ->sibling as unlinking only happens later in the same function. The membership WARN remains valid: a linked sub is always waited on by an ancestor's drain.
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 337ec00b1d9c676f637651c2cefddb8612b867ee ~ 6428093a4a986c38c9089b5eb32b56d914ef437a -
Linux Linux 7.1 -

II. Public POCs for CVE-2026-74731

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III. Intelligence Information for CVE-2026-74731

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Patches & Fixes for CVE-2026-74731 (2)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74638 drm/v3d: Serialize the scheduler timeout handlers
CVE-2026-74621 net/sched: act_ct: fix sk_buff leak when the header checks reject a packet
CVE-2026-74622 net: atlantic: free RX pages of consumed but not refilled buffers
CVE-2026-74623 net: atlantic: free stranded TX buffers on ring deinit
CVE-2026-74624 netfilter: nf_conntrack: defer invalid log until after unlock
CVE-2026-74625 netfilter: bridge: release template ct on non-IP path
CVE-2026-74627 net: devmem: prevent net-iov / page mixing
CVE-2026-74626 NTB: ntb_netdev: Preserve RX queue depth on allocation failure
CVE-2026-74628 net/x25: fix use-after-free of the socket by its timers
CVE-2026-74629 net/dibs: Correct freeing of dmb_clientid_arr
CVE-2026-74631 net: smc: fix splice entry lifetime imbalance in smc_rx_splice
CVE-2026-74630 ipv6: prevent in6_dev_get() from resurrecting inet6_dev
CVE-2026-74632 mm/huge_memory: fix huge_zero_pfn race
CVE-2026-74633 tracing: Fix NULL pointer dereference in module event cache removal
CVE-2026-74634 ring-buffer: Prevent subbuf order change when resizing is disabled
CVE-2026-74635 fbdev: bitblit: bound-check glyph index in bit_cursor()
CVE-2026-74636 tracing: Fix race between update_event_fields and, event_define_fields
CVE-2026-74637 perf/core: Fix group leader use-after-free after sibling detach
CVE-2026-74639 ALSA: us144mkii: re-anchor capture URBs on resubmission
CVE-2026-74650 staging: rtl8723bs: fix OOB read in WMM_param_handler()

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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