VulnerabilityPublished 23 Oct 2026

CVE-2026-98871: Linux kernel · crypto: ccp – Fix possible deadlock in SEV init failure path

Source GCVE Database

Authoritative record:CVE-2026-98871

Not known to be exploited · fixed in ffd3a3df92be697eb78118a146c6a5d5e6c1f724 : 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 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ffd3a3df92be697eb78118a146c6a5d5e6c1f724, b0e7ec0dab242c5e480121ba12400d0513e37ca2, 364f3841bc22c72b6e2cb72a1e3c91c9c8fc1ef4 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 23 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-34hf-3mqj-6x9g

What to do

Upgrade Linux kernel to ffd3a3df92be697eb78118a146c6a5d5e6c1f724, b0e7ec0dab242c5e480121ba12400d0513e37ca2, 364f3841bc22c72b6e2cb72a1e3c91c9c8fc1ef4 or 8e7e06ee7c2938ee3fa31a61cc5289a45c8c13f1.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7364a6fbca45f826952ea932699fb2171d06ee73, < ffd3a3df92be697eb78118a146c6a5d5e6c1f724	Fixed in ffd3a3df92be697eb78118a146c6a5d5e6c1f724
LinuxLinux	Affected ≥ 7364a6fbca45f826952ea932699fb2171d06ee73, < b0e7ec0dab242c5e480121ba12400d0513e37ca2	Fixed in b0e7ec0dab242c5e480121ba12400d0513e37ca2
LinuxLinux	Affected ≥ 7364a6fbca45f826952ea932699fb2171d06ee73, < 364f3841bc22c72b6e2cb72a1e3c91c9c8fc1ef4	Fixed in 364f3841bc22c72b6e2cb72a1e3c91c9c8fc1ef4
LinuxLinux	Affected ≥ 7364a6fbca45f826952ea932699fb2171d06ee73, < 8e7e06ee7c2938ee3fa31a61cc5289a45c8c13f1	Fixed in 8e7e06ee7c2938ee3fa31a61cc5289a45c8c13f1
LinuxLinux	Affected =6.9	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this deadlock by correcting the lock handling in the SEV initialization failure path. Users should apply the official kernel updates that include this fix once available. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor advisory for current remediation guidance.

Description

A deadlock vulnerability in the Linux kernel's crypto CCP SEV initialization failure path has been resolved. The issue occurs when the function __sev_platform_init_handle_init_ex_path() calls rmp_mark_pages_firmware() with an incorrect lock status, leading to a potential deadlock during cleanup after an RMPUPDATE failure. This deadlock happens because the parent function already holds the sev_cmd_mutex lock, but the called function does not honor this lock state. The fix involves passing the correct lock status to prevent the deadlock.

References

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