VulnerabilityPublished 18 Oct 2026

CVE-2026-98558: Linux kernel · net: flush skb_defer_nodes in dev_cpu_dead()

Source GCVE Database

Authoritative record:CVE-2026-98558· Medium

Not known to be exploited : upgrade to c68f4157463448a76893223e117170be8374d773 or 06e3f54e8b22040ada01a28343badf1990b4dd7d 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 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c68f4157463448a76893223e117170be8374d773, 06e3f54e8b22040ada01a28343badf1990b4dd7d

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-prw3-7248-3734

What to do

Upgrade Linux kernel to c68f4157463448a76893223e117170be8374d773 or 06e3f54e8b22040ada01a28343badf1990b4dd7d.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 68822bdf76f10c3dc80609d4e2cdc1e847429086, < c68f4157463448a76893223e117170be8374d773	Fixed in c68f4157463448a76893223e117170be8374d773
LinuxLinux	Affected ≥ 68822bdf76f10c3dc80609d4e2cdc1e847429086, < 06e3f54e8b22040ada01a28343badf1990b4dd7d	Fixed in 06e3f54e8b22040ada01a28343badf1990b4dd7d
LinuxLinux	Affected =5.19	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to properly flush skb_defer_nodes during CPU offline events and address related race conditions. Users should apply the official kernel update that includes this patch to resolve the issue. No additional mitigation steps are indicated beyond applying the patch.

Description

A vulnerability in the Linux kernel's network subsystem related to handling deferred socket buffers (skb_defer_nodes) when a CPU goes offline has been resolved. The issue caused stranded skbs holding page_pool fragments to stall system teardown processes indefinitely. The fix ensures proper flushing of skb_defer_nodes during CPU offline events and addresses race conditions involving CPU and NUMA node teardown.

References

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