VulnerabilityPublished 18 Oct 2026Updated 24 Oct 2026

CVE-2026-98479: Linux kernel · scsi: libiscsi_tcp: Check the data direction of a Data-In PDU

Affects Linux kernelSource CVE Database V5

Not known to be exploited · CVSS 7.5 High · fixed in ee56b5e18f566c0b5a183379dcd63d402cebf2f8 : patch Linux kernel soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ee56b5e18f566c0b5a183379dcd63d402cebf2f8, e3b25bf2cf2496e85bc05b33360faf9fdf880e03, de96dc11aee0d058927bff94a168e3c5c46483e2 +5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ a081c13e39b5c17052a7b46fafa61019c4c110ff, < ee56b5e18f566c0b5a183379dcd63d402cebf2f8	Fixed in ee56b5e18f566c0b5a183379dcd63d402cebf2f8
LinuxLinux	Affected ≥ a081c13e39b5c17052a7b46fafa61019c4c110ff, < e3b25bf2cf2496e85bc05b33360faf9fdf880e03	Fixed in e3b25bf2cf2496e85bc05b33360faf9fdf880e03
LinuxLinux	Affected ≥ a081c13e39b5c17052a7b46fafa61019c4c110ff, < de96dc11aee0d058927bff94a168e3c5c46483e2	Fixed in de96dc11aee0d058927bff94a168e3c5c46483e2
LinuxLinux	Affected ≥ a081c13e39b5c17052a7b46fafa61019c4c110ff, < bce07e2f37b5e4a427d36fd6b1c14067b27591db	Fixed in bce07e2f37b5e4a427d36fd6b1c14067b27591db
LinuxLinux	Affected ≥ a081c13e39b5c17052a7b46fafa61019c4c110ff, < 79991b770fc3685b1d5cf805b659a879edd19931	Fixed in 79991b770fc3685b1d5cf805b659a879edd19931
LinuxLinux	Affected ≥ a081c13e39b5c17052a7b46fafa61019c4c110ff, < 94e5bdd08e51c450d954bc592f591c233ca5c9df	Fixed in 94e5bdd08e51c450d954bc592f591c233ca5c9df

AI-suggested

A fix for this vulnerability is available and has been applied in the Linux kernel commits identified by the fixedVersions hashes. Users and administrators should update affected Linux kernel versions to a fixed release containing these patches. No additional mitigation is required once the kernel is updated.

Description

CVE-2026-98479 is a vulnerability in the Linux kernel's libiscsi_tcp component where the data direction of a Data-In PDU is not properly checked. This flaw allows a target to cause the initiator to write target-supplied data into the initiator's own memory pages during a WRITE command, potentially leading to data corruption. The issue affects Linux kernel version 2.6.29 and has been fixed in subsequent commits.

Impact

An attacker controlling an iSCSI target can exploit this vulnerability to cause the initiator to overwrite its own memory pages with attacker-controlled data during WRITE operations. This leads to data integrity issues, as the initiator's buffers or page cache may be silently corrupted without detection. The vulnerability does not impact confidentiality or availability directly but compromises data integrity, which can affect system reliability and correctness.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 09:41 UTC

Technical details

References

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