VulnerabilityPublished 18 Oct 2026

CVE-2026-98593: Linux kernel · s390/debug: Fix NULL pointer dereference in debug_info_copy()

Source GCVE Database

Authoritative record:CVE-2026-98593· Medium

Not known to be exploited · fixed in c593f38e1cdb92f87d01be4c4e5ac12417b1454b : 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 c593f38e1cdb92f87d01be4c4e5ac12417b1454b, a19bede30f0da5ae56782edac62b5998a7434cba, 33f706884821da9cb55b650b7b1d4f2bdf800137 +4

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-v4qr-c46c-6qg3

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d72541f945127b4873dace501406a1bc8cd8e1e9, < c593f38e1cdb92f87d01be4c4e5ac12417b1454b	Fixed in c593f38e1cdb92f87d01be4c4e5ac12417b1454b
LinuxLinux	Affected ≥ d72541f945127b4873dace501406a1bc8cd8e1e9, < a19bede30f0da5ae56782edac62b5998a7434cba	Fixed in a19bede30f0da5ae56782edac62b5998a7434cba
LinuxLinux	Affected ≥ d72541f945127b4873dace501406a1bc8cd8e1e9, < 33f706884821da9cb55b650b7b1d4f2bdf800137	Fixed in 33f706884821da9cb55b650b7b1d4f2bdf800137
LinuxLinux	Affected ≥ d72541f945127b4873dace501406a1bc8cd8e1e9, < 13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225	Fixed in 13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225
LinuxLinux	Affected ≥ d72541f945127b4873dace501406a1bc8cd8e1e9, < 012bfcd5a51082d5a65f096dfb9ca652b5267965	Fixed in 012bfcd5a51082d5a65f096dfb9ca652b5267965
LinuxLinux	Affected ≥ d72541f945127b4873dace501406a1bc8cd8e1e9, < 9c6af88fbefbe77608b77409df23a1617e28398c	Fixed in 9c6af88fbefbe77608b77409df23a1617e28398c

AI-suggested

A fix has been implemented to skip the copy loop when the source has no areas, preventing the NULL pointer dereference. Users should apply the official Linux kernel patch that resolves this issue. Since no vendor advisory or patch link is provided, check the official Linux kernel repositories or security advisories for the patch and update accordingly.

Description

A NULL pointer dereference vulnerability in the Linux kernel's s390/debug component was fixed. The issue occurs in debug_info_copy() when debug_register_static() fails and clears certain pointers but leaves area bounds unchanged, leading to dereferencing NULL pointers during area copying operations.

References

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