VulnerabilityPublished 28 Oct 2026

CVE-2026-99152: Linux kernel · scsi: libiscsi: Validate the task named by a management response

Source GCVE Database

Authoritative record:CVE-2026-99152

Not known to be exploited · fixed in f721487523d45941aed4b0ac8d829b0461a7d860 : patch Linux kernel soon.

Data as of 28 Oct 2026, 14:01 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in f721487523d45941aed4b0ac8d829b0461a7d860, 55a65ef61e2775aeb18fda63bd1959fa8b41f936, 11bffcd9cb346732eab2914ef44fe777a3f0b585

Exploitation evidence

Disclosed: evidence found.
CVE published 28 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-j47q-hp6h-cpw3

What to do

Upgrade Linux kernel to f721487523d45941aed4b0ac8d829b0461a7d860, 55a65ef61e2775aeb18fda63bd1959fa8b41f936 or 11bffcd9cb346732eab2914ef44fe777a3f0b585.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8, < f721487523d45941aed4b0ac8d829b0461a7d860	Fixed in f721487523d45941aed4b0ac8d829b0461a7d860
LinuxLinux	Affected ≥ 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8, < 55a65ef61e2775aeb18fda63bd1959fa8b41f936	Fixed in 55a65ef61e2775aeb18fda63bd1959fa8b41f936
LinuxLinux	Affected ≥ 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8, < 11bffcd9cb346732eab2914ef44fe777a3f0b585	Fixed in 11bffcd9cb346732eab2914ef44fe777a3f0b585
LinuxLinux	Affected =2.6.18	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to properly validate the task named by management responses, ensuring the task is active and valid before dereferencing. Users should update to a kernel version that includes this fix. Since no vendor advisory or patch links are provided, check the Linux kernel mailing lists or official repositories for the fixed version. Until patched, avoid exposure to untrusted iSCSI targets.

Description

A vulnerability in the Linux kernel's iSCSI implementation allows a target to reference invalid task slots in the task pool, leading to null pointer dereferences and kernel crashes. This occurs because the kernel does not properly validate the task named by certain management responses, allowing an attacker to cause a general protection fault with crafted iSCSI packets.

Impact

An attacker controlling the iSCSI target can cause a denial of service by triggering kernel crashes through null pointer dereferences. This can be done by sending unsolicited NOP-In or Text Response PDUs with crafted ITT values referencing invalid task slots. The vulnerability leads to general protection faults and kernel panics, disrupting system availability.

Summary

The Linux kernel's iSCSI subsystem (libiscsi) improperly validates the task identifier (ITT) in management response PDUs. Specifically, __iscsi_complete_pdu() fetches tasks for certain response types using iscsi_itt_to_task(), which only bounds the index against cmds_max but does not verify if the task is active or valid. This allows a malicious target to specify any slot in the task pool, including unused ones, resulting in task->conn being NULL. Subsequent dereferences of this NULL pointer in iscsi_nop_out_rsp() and iscsi_complete_task() cause kernel crashes (general protection faults). The fix requires validating that the task is in flight and not a SCSI command, similar to iscsi_itt_to_ctask() behavior.

References

Community reviews

Loading reviews…