VulnerabilityPublished 18 Oct 2026

CVE-2026-98525: Linux kernel · mctp: route: iterate socket tag list in mctp_lookup_prealloc_tag()

Source GCVE Database

Authoritative record:CVE-2026-98525· Medium

Not known to be exploited · fixed in f178300e2f56ca9ec2a3a0090608730bbee0af7b : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f178300e2f56ca9ec2a3a0090608730bbee0af7b, e35cb500dd14882f8dee61783fccd1823fd3ab0d, 09299addab11857e92eca55cd8ef3350b927c90c +1

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-v647-mrp8-mh99

What to do

Upgrade Linux kernel to f178300e2f56ca9ec2a3a0090608730bbee0af7b, e35cb500dd14882f8dee61783fccd1823fd3ab0d, 09299addab11857e92eca55cd8ef3350b927c90c or 26cc0e69cce062cd3aa6fae33074684669c35a71.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 63ed1aab3d40aa61aaa66819bdce9377ac7f40fa, < f178300e2f56ca9ec2a3a0090608730bbee0af7b	Fixed in f178300e2f56ca9ec2a3a0090608730bbee0af7b
LinuxLinux	Affected ≥ 63ed1aab3d40aa61aaa66819bdce9377ac7f40fa, < e35cb500dd14882f8dee61783fccd1823fd3ab0d	Fixed in e35cb500dd14882f8dee61783fccd1823fd3ab0d
LinuxLinux	Affected ≥ 63ed1aab3d40aa61aaa66819bdce9377ac7f40fa, < 09299addab11857e92eca55cd8ef3350b927c90c	Fixed in 09299addab11857e92eca55cd8ef3350b927c90c
LinuxLinux	Affected ≥ 63ed1aab3d40aa61aaa66819bdce9377ac7f40fa, < 26cc0e69cce062cd3aa6fae33074684669c35a71	Fixed in 26cc0e69cce062cd3aa6fae33074684669c35a71
LinuxLinux	Affected =5.18	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to restrict tag iteration to the socket's own tag list, preventing cross-socket tag consumption. Users should update to a Linux kernel version that includes this patch. Since this is a kernel-level fix, applying the official kernel update is the recommended remediation.

Description

A vulnerability in the Linux kernel's MCTP socket implementation allowed any MCTP socket within the same network namespace to use and consume another socket's preallocated tag. This issue was due to iterating over a namespace-wide tag list instead of the socket's own tag list in the mctp_lookup_prealloc_tag() function. The flaw has been resolved by restricting tag iteration to the socket's own tag list, preventing unauthorized tag usage.

References

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