Kernel compromise via iSCSI connection teardown race
Published May 21, 2024 · Updated Aug 5, 2026
Use-after-free in Linux kernel iSCSI initiator code allows remote attackers controlling a target session to compromise the kernel. During reset cleanup, iscsi_conn_teardown can wake error-handling threads and free iscsi_conn before those threads finish accessing its ehwait field. An established iSCSI session with in-flight I/O and target-driven failures is required; exploitation can disclose or corrupt kernel memory, execute code, or panic the host.
Summary
What happened
Use-after-free in Linux kernel iSCSI initiator code allows remote attackers controlling a target session to compromise the kernel. During reset cleanup, iscsi_conn_teardown can wake error-handling threads and free iscsi_conn before those threads finish accessing its ehwait field. An established iSCSI session with in-flight I/O and target-driven failures is required; exploitation can disclose or corrupt kernel memory, execute code, or panic the host.
The record
- CVE
- CVE-2021-47328
- Published
- May 21, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 21, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0adcec66bce9b7e84847da09ae3f8bc36e753312
- Affected versionversion=20b38ab5b687df3dbb873cfb0efa946a021f890a
- Affected versionversion=3.18.22 <3.19
- Affected versionversion=3.2.72 <3.3
- Affected versionversion=3.4.111 <3.5
- Affected versionversion=4.1.7 <4.2
- Affected versionversion=4.2
- Affected versionversion=660d0831d1494a6837b2f810d08b5be092c1f31d <89812e7957ab0746eab66ed6fc49d52bb4dca250
- Affected versionversion=660d0831d1494a6837b2f810d08b5be092c1f31d <bf20d85a88384574fabb3d53ad62a8af57e7ab11
- Affected versionversion=660d0831d1494a6837b2f810d08b5be092c1f31d <d04958a348e560938410e04a12fb99da9c7e6a00
- Affected versionversion=660d0831d1494a6837b2f810d08b5be092c1f31d <ec29d0ac29be366450a7faffbcf8cba3a6a3b506
- Affected versionversion=660d0831d1494a6837b2f810d08b5be092c1f31d <f0a031f7c55ffd944fead1ddaf2aa94df9a158c1
- Affected versionversion=660d0831d1494a6837b2f810d08b5be092c1f31d <fa9542b35ceb4202e8f8d65f440529a63524dca9
- Affected versionversion=71b6a23ea944c6a30958bd15a69211e1fd521e1e
- Affected versionversion=861a9633c22ee8b484e1b4054995f7e1b94a3834
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
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
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo