VulnerabilityPublished 18 Oct 2026

CVE-2026-98603: Linux kernel · ovpn: replace bind when clearing stale local source

Source GCVE Database

Authoritative record:CVE-2026-98603· Medium

Not known to be exploited · fixed in c44a04722f7dae9a45a101b8e100931ab59f1c18 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c44a04722f7dae9a45a101b8e100931ab59f1c18, 72bd1bea37ea2c8553938f086bf48ccd2147dfe1, 7d8104988f423572df1f3347ce578037b1043f34

Exploitation evidence

Disclosed: evidence found.
CVE published 18 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-fvvm-56rx-vqjg

What to do

Upgrade Linux kernel to c44a04722f7dae9a45a101b8e100931ab59f1c18, 72bd1bea37ea2c8553938f086bf48ccd2147dfe1 or 7d8104988f423572df1f3347ce578037b1043f34.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 08857b5ec5d91d83e69e40a36554a8c7557b7301, < c44a04722f7dae9a45a101b8e100931ab59f1c18	Fixed in c44a04722f7dae9a45a101b8e100931ab59f1c18
LinuxLinux	Affected ≥ 08857b5ec5d91d83e69e40a36554a8c7557b7301, < 72bd1bea37ea2c8553938f086bf48ccd2147dfe1	Fixed in 72bd1bea37ea2c8553938f086bf48ccd2147dfe1
LinuxLinux	Affected ≥ 08857b5ec5d91d83e69e40a36554a8c7557b7301, < 7d8104988f423572df1f3347ce578037b1043f34	Fixed in 7d8104988f423572df1f3347ce578037b1043f34
LinuxLinux	Affected =6.16	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this issue. Users should apply the official kernel updates that include this patch. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's ovpn UDP output fallback mechanism was resolved by changing how stale local source addresses are cleared. The issue involved clearing bind->local in place, which could cause torn IPv6 addresses due to concurrent lockless reads. The fix retries route lookup without modifying the bind, revalidates under lock, resets the cache, and publishes a replacement bind with a wildcard address. This prevents inconsistent routing cache states.

References

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