Linux aws: In the Linux kernel, the following vulnerability has been resolved: nfsd: provide locking for v4_end_grace Writing to v4_end_grace can race with… (CVE-2026-22980)
CVE-2026-22980 is a vulnerability in the Linux kernel's NFS server daemon (nfsd) related to improper locking for the v4_end_grace state. Writing to v4_end_grace can race with server shutdown, potentially causing use-after-free memory access. The issue arises because the nfsd_mutex cannot be held across the nfsd4_end_grace() call due to potential deadlocks. A new locking flag protected by client_lock was introduced to ensure safe client tracking calls and prevent restarting work after shutdown. This vulnerability affects multiple versions of the linux-aws kernel prior to specific fixed versions. A patch is available and included in updated Linux kernel packages. The vulnerability has a CVSS 3.1 score of 7.8, indicating high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported. Users are advised to update to the fixed kernel versions to mitigate the issue.
AI Analysis
Technical Summary
The vulnerability CVE-2026-22980 in the Linux kernel's NFS server daemon (nfsd) involves a race condition when writing to the v4_end_grace state. This race can occur with server shutdown, leading to memory being accessed after it has been freed, specifically in reclaim_str_hashtbl. The complexity arises because the nfsd_mutex cannot be held during the nfsd4_end_grace() call due to potential deadlocks caused by client tracking operations that may write to v4_end_grace. To address this, a new flag protected by nn->client_lock was introduced to indicate when it is safe to make client tracking calls and to prevent scheduling work after shutdown has begun. This fix prevents use-after-free conditions and potential system instability. The vulnerability affects various linux-aws kernel versions prior to 5.15.0-1103.110~20.04.1 and related versions. The issue is addressed in updated kernel packages provided by Ubuntu and other distributions, requiring a system update and reboot. The CVSS score of 7.8 reflects the vulnerability's potential to impact confidentiality, integrity, and availability if exploited.
Potential Impact
Exploitation of this vulnerability could lead to memory corruption due to use-after-free conditions in the NFS server daemon, potentially causing system crashes or allowing an attacker with local privileges to compromise system stability and security. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
A patch is available and has been released by Ubuntu and other Linux distributors. Users should update their Linux kernel packages to the fixed versions listed in the vendor advisory and reboot their systems to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Following the vendor's update instructions will mitigate this vulnerability effectively.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: nfsd: provide locking for v4_end_grace Writing to v4_end_grace can race with… (CVE-2026-22980)
Description
CVE-2026-22980 is a vulnerability in the Linux kernel's NFS server daemon (nfsd) related to improper locking for the v4_end_grace state. Writing to v4_end_grace can race with server shutdown, potentially causing use-after-free memory access. The issue arises because the nfsd_mutex cannot be held across the nfsd4_end_grace() call due to potential deadlocks. A new locking flag protected by client_lock was introduced to ensure safe client tracking calls and prevent restarting work after shutdown. This vulnerability affects multiple versions of the linux-aws kernel prior to specific fixed versions. A patch is available and included in updated Linux kernel packages. The vulnerability has a CVSS 3.1 score of 7.8, indicating high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported. Users are advised to update to the fixed kernel versions to mitigate the issue.
CVSS v3.1
Score 7.8high
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=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-22980 in the Linux kernel's NFS server daemon (nfsd) involves a race condition when writing to the v4_end_grace state. This race can occur with server shutdown, leading to memory being accessed after it has been freed, specifically in reclaim_str_hashtbl. The complexity arises because the nfsd_mutex cannot be held during the nfsd4_end_grace() call due to potential deadlocks caused by client tracking operations that may write to v4_end_grace. To address this, a new flag protected by nn->client_lock was introduced to indicate when it is safe to make client tracking calls and to prevent scheduling work after shutdown has begun. This fix prevents use-after-free conditions and potential system instability. The vulnerability affects various linux-aws kernel versions prior to 5.15.0-1103.110~20.04.1 and related versions. The issue is addressed in updated kernel packages provided by Ubuntu and other distributions, requiring a system update and reboot. The CVSS score of 7.8 reflects the vulnerability's potential to impact confidentiality, integrity, and availability if exploited.
Potential Impact
Exploitation of this vulnerability could lead to memory corruption due to use-after-free conditions in the NFS server daemon, potentially causing system crashes or allowing an attacker with local privileges to compromise system stability and security. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
A patch is available and has been released by Ubuntu and other Linux distributors. Users should update their Linux kernel packages to the fixed versions listed in the vendor advisory and reboot their systems to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Following the vendor's update instructions will mitigate this vulnerability effectively.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-22980
- 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"]
- Cvss Version
- 3.1
Threat ID: 6a5b637b2d1edb114c8b53be
Added to database: 07/18/2026, 11:28:59 UTC
Last enriched: 08/22/2026, 21:52:06 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 6
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