VulnerabilityPublished 23 Oct 2026

CVE-2026-98884: Linux kernel · mmc: core: Add validation for host-provided max_segs

Source GCVE Database

Authoritative record:CVE-2026-98884· High

Not known to be exploited · fixed in c465608bd25d7f8565be7817a6a36a5d69f8aa14 : patch Linux kernel soon.

Data as of 26 Oct 2026, 14:05 UTC

Severity

High

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 c465608bd25d7f8565be7817a6a36a5d69f8aa14, b037c2f7794aa01ee2a00e43c29645fd2dd2dfb9, a8283f7d93f0d9336b15618b9665279ff6944319 +3

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-f98w-wx7q-xjvq

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 05e5b136459b11cd9559370d5756719e08074fe0, < c465608bd25d7f8565be7817a6a36a5d69f8aa14	Fixed in c465608bd25d7f8565be7817a6a36a5d69f8aa14
LinuxLinux	Affected ≥ 05e5b136459b11cd9559370d5756719e08074fe0, < b037c2f7794aa01ee2a00e43c29645fd2dd2dfb9	Fixed in b037c2f7794aa01ee2a00e43c29645fd2dd2dfb9
LinuxLinux	Affected ≥ 05e5b136459b11cd9559370d5756719e08074fe0, < a8283f7d93f0d9336b15618b9665279ff6944319	Fixed in a8283f7d93f0d9336b15618b9665279ff6944319
LinuxLinux	Affected ≥ 05e5b136459b11cd9559370d5756719e08074fe0, < 9cca3c0c1472d6204ef8a78a6e7b3afe9610b22e	Fixed in 9cca3c0c1472d6204ef8a78a6e7b3afe9610b22e
LinuxLinux	Affected ≥ 05e5b136459b11cd9559370d5756719e08074fe0, < 03f5a16ec85beebabd5ab5e67ac1527f87908ded	Fixed in 03f5a16ec85beebabd5ab5e67ac1527f87908ded
LinuxLinux	Affected ≥ 05e5b136459b11cd9559370d5756719e08074fe0, < 3e0483e93a8be320f70a1ff68d835f7f015af311	Fixed in 3e0483e93a8be320f70a1ff68d835f7f015af311

AI-suggested

A fix is available that adds validation to the MMC core to detect invalid zero sg_len values derived from max_segs and returns an error instead of proceeding. Systems should apply the official Linux kernel patch that includes this validation. No other mitigation is indicated.

Description

A vulnerability in the Linux kernel MMC core was resolved by adding validation for the host-provided max_segs field. The max_segs field is an unsigned short, and if set to an excessively large value by a host driver, it may be truncated to zero. This causes a zero-size allocation request in mmc_alloc_sg(), leading to undefined behavior and a kernel crash due to invalid memory access. The fix adds a validation check to detect zero sg_len and returns an error instead of crashing.

References

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