VulnerabilityPublished 25 Sep 2026Updated 19 Oct 2026

CVE-2026-98076: Linux kernel · tracing/probes: Fix use-after-free on field name/type of events with multiple probes

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in a2510fcaad92b09b34574c97e8356234c6a84a9a : patch Linux kernel soon.

Data as of 26 Oct 2026, 14:05 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in a2510fcaad92b09b34574c97e8356234c6a84a9a, 38305e1b8b1ec27eef8f2d4e461e3b6c8624d494, 9379e193826f23876daccb3351fab89c87084ba3 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ca89bc071d5e4e981dcc52e0ca90f4500d332e42, < a2510fcaad92b09b34574c97e8356234c6a84a9a	Fixed in a2510fcaad92b09b34574c97e8356234c6a84a9a
LinuxLinux	Affected ≥ ca89bc071d5e4e981dcc52e0ca90f4500d332e42, < 38305e1b8b1ec27eef8f2d4e461e3b6c8624d494	Fixed in 38305e1b8b1ec27eef8f2d4e461e3b6c8624d494
LinuxLinux	Affected ≥ ca89bc071d5e4e981dcc52e0ca90f4500d332e42, < 9379e193826f23876daccb3351fab89c87084ba3	Fixed in 9379e193826f23876daccb3351fab89c87084ba3
LinuxLinux	Affected ≥ ca89bc071d5e4e981dcc52e0ca90f4500d332e42, < 411c9080a776577664531b4f7d3ee53b7a747ba8	Fixed in 411c9080a776577664531b4f7d3ee53b7a747ba8
LinuxLinux	Affected ≥ ca89bc071d5e4e981dcc52e0ca90f4500d332e42, < 178ff2e011e21fbebdf57f5d58a408fe59136d82	Fixed in 178ff2e011e21fbebdf57f5d58a408fe59136d82
LinuxLinux	Affected ≥ ca89bc071d5e4e981dcc52e0ca90f4500d332e42, < 86b7a239ec6b14a7544200ede85474c6f5526049	Fixed in 86b7a239ec6b14a7544200ede85474c6f5526049

AI-suggested

A fix is available in the Linux kernel as indicated by multiple fixed commit versions. Users should update to a fixed kernel version containing the patches referenced by the commit hashes provided. No additional mitigation is required as the issue is resolved by the official fix.

Description

A use-after-free vulnerability was identified and fixed in the Linux kernel's tracing/probes subsystem affecting events with multiple probes. The issue arises because field name and type strings for probe-based dynamic events were not duplicated but referenced directly, leading to dangling pointers when one of multiple probes is removed. This can cause kernel memory corruption and crashes when accessing freed memory.

Impact

This vulnerability can cause kernel memory corruption and crashes (use-after-free) when accessing freed memory in the tracing subsystem. This can lead to system instability or denial of service. There is no indication of remote exploitation or privilege escalation in the provided data.

Summary

The Linux kernel tracing/probes subsystem had a use-after-free vulnerability in handling field name/type strings of events with multiple probes (kprobe, uprobe, eprobe, fprobe). When multiple probes share an event, deleting the first probe frees its argument strings, but the event remains registered via surviving probes. Since the field list references the freed strings without duplication, subsequent field lookups access freed memory, causing a use-after-free. The fix duplicates these strings and anchors them to the event, which outlives individual probes. The flaw was reliably reproducible and discovered by Tencent Yunding Lab's autokbug dynamic kernel fuzzer.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 12:51 UTC

Technical details

References

Community reviews

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