CVE-2026-72083Network attack vector

Host crash via prematurely unmapped iSCSI ISID

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in the Linux kernel iSCSI target core allows remote attackers to crash the host via a crafted REGISTER AND MOVE request. core_scsi3_emulate_pro_register_and_move() unmaps a multi-page parameter buffer before strcmp() and registration helpers finish reading the ISID pointer into it. The target must expose an iSCSI portal and process a parameter list longer than 4,096 bytes; the established consequence is a host crash.

CVSS severity9.8
Critical
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel iSCSI target core allows remote attackers to crash the host via a crafted REGISTER AND MOVE request. core_scsi3_emulate_pro_register_and_move() unmaps a multi-page parameter buffer before strcmp() and registration helpers finish reading the ISID pointer into it. The target must expose an iSCSI portal and process a parameter list longer than 4,096 bytes; the established consequence is a host crash.

The record

CVE
CVE-2026-72083
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.2.9 <3.3
  2. Affected versionversion=3.3
  3. Affected versionversion=4949314c7283ea4f9ade182ca599583b89f7edd6 <05b3e37433cf2eaf8867f1c16528aa347bb212ab
  4. Affected versionversion=4949314c7283ea4f9ade182ca599583b89f7edd6 <59a2a5a37dc49a641ad6bc64aee34e5a61025ffd
  5. Affected versionversion=4949314c7283ea4f9ade182ca599583b89f7edd6 <7d56f5c868d92c9d504a34a3ea450bce481c7f63
  6. Affected versionversion=4949314c7283ea4f9ade182ca599583b89f7edd6 <9f8076cc73dfa6b10155978c160587e986b22169
  7. Affected versionversion=4949314c7283ea4f9ade182ca599583b89f7edd6 <a040004846f1fbe687f6ec76d9ccc27b4ead42e4
  8. Affected versionversion=4949314c7283ea4f9ade182ca599583b89f7edd6 <cb7bdae7fba404852ade34b0c1445fbaf3e54fbb
  9. Affected versionversion=4949314c7283ea4f9ade182ca599583b89f7edd6 <ef2ee18fec92088c7d8877baf7674e89389ccd66
  10. Affected versionversion=4949314c7283ea4f9ade182ca599583b89f7edd6 <fda6a1f3c3d7047b5ce5654487649c2daa738bfc
  11. Affected versionversion=d2227f84ba0e97906153ac83db13213fb2e3938d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.2.9 <3.3; version=3.3; version=4949314c7283ea4f9ade182ca599583b89f7edd6 <05b3e37433cf2eaf8867f1c16528aa347bb212ab; version=4949314c7283ea4f9ade182ca599583b89f7edd6 <59a2a5a37dc49a641ad6bc64aee34e5a61025ffd; version=4949314c7283ea4f9ade182ca599583b89f7edd6 <7d56f5c868d92c9d504a34a3ea450bce481c7f63; version=4949314c7283ea4f9ade182ca599583b89f7edd6 <9f8076cc73dfa6b10155978c160587e986b22169; version=4949314c7283ea4f9ade182ca599583b89f7edd6 <a040004846f1fbe687f6ec76d9ccc27b4ead42e4; version=4949314c7283ea4f9ade182ca599583b89f7edd6 <cb7bdae7fba404852ade34b0c1445fbaf3e54fbb; version=4949314c7283ea4f9ade182ca599583b89f7edd6 <ef2ee18fec92088c7d8877baf7674e89389ccd66; version=4949314c7283ea4f9ade182ca599583b89f7edd6 <fda6a1f3c3d7047b5ce5654487649c2daa738bfc; version=d2227f84ba0e97906153ac83db13213fb2e3938d

Published CVSS scores

9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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