VulnerabilityPublished 28 Oct 2026

CVE-2026-99173: Linux kernel · eventfs: Free the eventfs_inode after an rcu grace period too

Source GCVE Database

Authoritative record:CVE-2026-99173

Not known to be exploited · fixed in 4586ef24ce390e8becb9f3e5852d5d3978b01c33 : patch Linux kernel soon.

Data as of 28 Oct 2026, 13:57 UTC

Severity

High

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

Patch: Available – fixed in 4586ef24ce390e8becb9f3e5852d5d3978b01c33, 45fcfd5d9c10e0aa977ed5b9bd445707e01bb107, 6.11 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 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.

ghsa-fx9f-7wc6-cjjx

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.6.46 <6.7 >=6.10.5 <6.11	Fixed in 4586ef24ce390e8becb9f3e5852d5d3978b01c33 45fcfd5d9c10e0aa977ed5b9bd445707e01bb107 6.11 6.7 2cd88c498ecff8e22bf4c397b8eb226db70ac343
LinuxLinux	Affected =6.11	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel by changing the freeing mechanism of eventfs_inode to wait for both SRCU and RCU grace periods. Users should update to the fixed kernel version containing commit 8e556432477e or later. No additional mitigation steps are indicated.

Description

CVE-2026-99173 is a use-after-free vulnerability in the Linux kernel's eventfs subsystem. The flaw occurs because eventfs_inode objects are freed after an SRCU grace period, which does not wait for rcu_read_lock() sections, allowing a pathwalk to access freed memory. This leads to a kernel slab-use-after-free error during tracefs_d_revalidate() execution. The issue was fixed by changing the freeing mechanism to wait for both SRCU and RCU grace periods.

References

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