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CVE-2026-74636— tracing: Fix race between update_event_fields and, event_define_fields

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，以下漏洞已得到解决： tracing：修复 update_event_fields 与 event_define_fields 之间的竞态条件 以下序列可能导致 与 之间发生竞态条件： 其中， 中对 的访问未受 保护。 这将导致以下恐慌（panic）： 修复方法：在 中，先获取 ，再获取 。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 21

VendorProduct Version RangeStatus
Linux Linux 7c6bd60999f32138e3b73fd97ea11ef47a94de25< 4e39f7b4d9d36508c53e89e6cbc640728df870b5 affected
b3bc8547d3be60898818885f5bf22d0a62e2eb48< a30d421468300b1e7b2f233136aeb2db8013f555 affected
b3bc8547d3be60898818885f5bf22d0a62e2eb48< e5f1d301b4bdaa4206db251fdc691f623162b0a8 affected
b3bc8547d3be60898818885f5bf22d0a62e2eb48< fdeb190b0905a6aaed1e5d6adfb8613214748d7d affected
b3bc8547d3be60898818885f5bf22d0a62e2eb48< ed49684e69f846bf50b5050651ccdb87cfd152c0 affected
b3bc8547d3be60898818885f5bf22d0a62e2eb48< f128740f39ab28d1f4ad5bdd10f3e117eec0c374 affected
b3bc8547d3be60898818885f5bf22d0a62e2eb48< c3730b8373bb5059d735509b9e6a00d7eb337d7c affected
55defdf935fab9f2989a197aae1042c082d9a343 affected
… +13 more rows
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I. Basic Information for CVE-2026-74636

Vulnerability Information
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Vulnerability Title
tracing: Fix race between update_event_fields and, event_define_fields
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix race between update_event_fields and, event_define_fields The following sequence may leads race between event_define_fields() and update_event_fields(): CPU0 (loads module A) CPU1 (loads module B) =============================== =============================== load_module(A) load_module(B) notifier_call_chain notifier_call_chain trace_module_notify trace_module_notify mutex_lock(&event_mutex) trace_event_update_all() trace_module_add_events(A) down_write(&trace_event_sem) __register_event(call_A) __add_event_to_tracers(call_A) event_define_fields(call_A) for each f: list_for_each_entry(field, list_add(&f->link, &class->fields, link) &class->fields) field = class->fields->next; Where access to the class->fields is not protected by the event_mutex in trace_event_update_all(). This produces the following panic: Unable to handle kernel access ... at virtual address 0000000000000018 pc : update_event_fields+0xf8/0x368 Call trace: update_event_fields+0xf8/0x368 trace_event_update_all+0x7c/0x2b4 trace_module_notify+0x4c/0x1dc notifier_call_chain+0x84/0x168 blocking_notifier_call_chain_robust+0x64/0xd4 load_module+0x10c8/0x123c __arm64_sys_finit_module+0x230/0x31c Fix by taking event_mutex in trace_event_update_all() before trace_event_sem.
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 7c6bd60999f32138e3b73fd97ea11ef47a94de25 ~ 4e39f7b4d9d36508c53e89e6cbc640728df870b5 -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-74636

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III. Intelligence Information for CVE-2026-74636

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Patches & Fixes for CVE-2026-74636 (7)

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

CVE-2026-74640 ALSA: FCP: fix OOB write in fcp_meter_ctl_get()
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-2026-74637 perf/core: Fix group leader use-after-free after sibling detach
CVE-2026-74639 ALSA: us144mkii: re-anchor capture URBs on resubmission
CVE-2026-74638 drm/v3d: Serialize the scheduler timeout handlers
CVE-2026-74651 staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74636

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