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Vulnerability details: VCID-v8rm-k3as-1ydy
Vulnerability ID VCID-v8rm-k3as-1ydy
Aliases CVE-2026-31481
Summary In the Linux kernel, the following vulnerability has been resolved: tracing: Drain deferred trigger frees if kthread creation fails Boot-time trigger registration can fail before the trigger-data cleanup kthread exists. Deferring those frees until late init is fine, but the post-boot fallback must still drain the deferred list if kthread creation never succeeds. Otherwise, boot-deferred nodes can accumulate on trigger_data_free_list, later frees fall back to synchronously freeing only the current object, and the older queued entries are leaked forever. To trigger this, add the following to the kernel command line: trace_event=sched_switch trace_trigger=sched_switch.traceon,sched_switch.traceon The second traceon trigger will fail and be freed. This triggers a NULL pointer dereference and crashes the kernel. Keep the deferred boot-time behavior, but when kthread creation fails, drain the whole queued list synchronously. Do the same in the late-init drain path so queued entries are not stranded there either.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-772 Missing Release of Resource after Effective Lifetime
System Score Found at
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2026-31481
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2026-31481
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2026-31481
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2026-31481
cvssv3.1 5.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31481.json
https://api.first.org/data/v1/epss?cve=CVE-2026-31481
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2460687 https://bugzilla.redhat.com/show_bug.cgi?id=2460687
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.02887
EPSS Score 0.00014
Published At April 29, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-23T05:41:03.311358+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.4.0