In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: fixup hang in nvmet_tcp_listen_data_ready() When the socket is closed… (CVE-2026-23179)
A vulnerability in the Linux kernel's nvmet-tcp subsystem could cause a hang due to a deadlock when a socket is closed while in TCP_LISTEN state. The issue arises because a callback flushes outstanding packets and calls nvmet_tcp_listen_data_ready() with the sk_callback_lock held, which can lead to deadlock if not properly checked. This flaw has been resolved in Linux kernel versions 6.8.0 and later. The vulnerability is rated medium severity and no known exploits are reported in the wild. A patch is available and included in recent Linux kernel updates distributed by Ubuntu.
AI Analysis
Technical Summary
The Linux kernel contained a vulnerability in the nvmet-tcp subsystem where closing a socket in TCP_LISTEN state triggered a callback that flushed outstanding packets and called nvmet_tcp_listen_data_ready() while holding the sk_callback_lock. Without checking the TCP_LISTEN state before acquiring the lock, this caused a deadlock hang. This issue has been fixed in Linux kernel version 6.8.0 and later. The fix prevents the deadlock by verifying the socket state before attempting to acquire the lock. This vulnerability is part of a broader set of Linux kernel security fixes released by Ubuntu in May 2026.
Potential Impact
The vulnerability could cause the affected system's kernel to hang due to a deadlock condition when handling TCP_LISTEN sockets in the nvmet-tcp subsystem. This could lead to denial of service conditions on affected systems. There are no reports of exploitation in the wild. The impact is limited to system stability and availability rather than direct privilege escalation or data compromise.
Mitigation Recommendations
A patch addressing this vulnerability is available and has been incorporated into Linux kernel versions 6.8.0 and later. Users should update their Linux kernel to version 6.8.0 or newer as provided by their distribution vendor, such as the Ubuntu kernel packages listed in the vendor advisory. After updating, a system reboot is required to apply the fix. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation steps are required beyond applying the official kernel update.
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: fixup hang in nvmet_tcp_listen_data_ready() When the socket is closed… (CVE-2026-23179)
Description
A vulnerability in the Linux kernel's nvmet-tcp subsystem could cause a hang due to a deadlock when a socket is closed while in TCP_LISTEN state. The issue arises because a callback flushes outstanding packets and calls nvmet_tcp_listen_data_ready() with the sk_callback_lock held, which can lead to deadlock if not properly checked. This flaw has been resolved in Linux kernel versions 6.8.0 and later. The vulnerability is rated medium severity and no known exploits are reported in the wild. A patch is available and included in recent Linux kernel updates distributed by Ubuntu.
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel contained a vulnerability in the nvmet-tcp subsystem where closing a socket in TCP_LISTEN state triggered a callback that flushed outstanding packets and called nvmet_tcp_listen_data_ready() while holding the sk_callback_lock. Without checking the TCP_LISTEN state before acquiring the lock, this caused a deadlock hang. This issue has been fixed in Linux kernel version 6.8.0 and later. The fix prevents the deadlock by verifying the socket state before attempting to acquire the lock. This vulnerability is part of a broader set of Linux kernel security fixes released by Ubuntu in May 2026.
Potential Impact
The vulnerability could cause the affected system's kernel to hang due to a deadlock condition when handling TCP_LISTEN sockets in the nvmet-tcp subsystem. This could lead to denial of service conditions on affected systems. There are no reports of exploitation in the wild. The impact is limited to system stability and availability rather than direct privilege escalation or data compromise.
Mitigation Recommendations
A patch addressing this vulnerability is available and has been incorporated into Linux kernel versions 6.8.0 and later. Users should update their Linux kernel to version 6.8.0 or newer as provided by their distribution vendor, such as the Ubuntu kernel packages listed in the vendor advisory. After updating, a system reboot is required to apply the fix. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation steps are required beyond applying the official kernel update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23179
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
Threat ID: 6a5b63062d1edb114c8a84a6
Added to database: 07/18/2026, 11:27:02 UTC
Last enriched: 08/01/2026, 07:20:27 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 6
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