In the Linux kernel, the following vulnerability has been resolved: libceph: make free_choose_arg_map() resilient to partial allocation… (CVE-2026-22991)
A vulnerability in the Linux kernel's libceph component could cause a NULL pointer dereference in the free_choose_arg_map() function when partial memory allocation fails. This issue has been resolved in updated kernel versions. The flaw could lead to a denial of service due to kernel crash. Multiple Linux kernel subsystems were also fixed in related updates. The vulnerability is rated medium severity with a CVSS score of 7.5. Patches are available and included in Ubuntu security updates requiring system reboot and recompilation of third-party kernel modules.
AI Analysis
Technical Summary
The Linux kernel vulnerability CVE-2026-22991 involves the libceph library's free_choose_arg_map() function, which may dereference a NULL pointer if its caller fails after a partial allocation. Specifically, in decode_choose_args(), if allocation of arg_map->args fails, free_choose_arg_map() is called while arg_map->size is non-zero, causing iteration over a NULL pointer and potential kernel crash. This issue has been fixed by adding pointer checks before iteration to prevent NULL pointer dereference. The vulnerability is part of a broader set of Linux kernel fixes addressing multiple subsystems and security issues. The CVSS 3.1 score is 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating network exploitable with no privileges required, causing high impact on availability but no confidentiality or integrity impact. Ubuntu has released patched kernel versions for various distributions and platforms, requiring system reboot and recompilation of kernel modules.
Potential Impact
The vulnerability can cause a denial of service by triggering a NULL pointer dereference in the Linux kernel, leading to system crashes. There is no direct impact on confidentiality or integrity. The flaw is exploitable remotely without privileges or user interaction, increasing risk of disruption. No known exploits in the wild have been reported. The issue is part of multiple kernel security fixes addressing various subsystems.
Mitigation Recommendations
A patch is available and included in official Linux kernel updates distributed by Ubuntu. Users should update to the fixed kernel versions as listed in the Ubuntu security notices USN-8096-1 and USN-8096-2. After updating, a system reboot is required to apply the changes. Due to an ABI change, recompilation and reinstallation of all third-party kernel modules is necessary. No other mitigations are required as the issue is resolved by the official fix.
In the Linux kernel, the following vulnerability has been resolved: libceph: make free_choose_arg_map() resilient to partial allocation… (CVE-2026-22991)
Description
A vulnerability in the Linux kernel's libceph component could cause a NULL pointer dereference in the free_choose_arg_map() function when partial memory allocation fails. This issue has been resolved in updated kernel versions. The flaw could lead to a denial of service due to kernel crash. Multiple Linux kernel subsystems were also fixed in related updates. The vulnerability is rated medium severity with a CVSS score of 7.5. Patches are available and included in Ubuntu security updates requiring system reboot and recompilation of third-party kernel modules.
CVSS v3.1
Score 7.5high
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 vulnerability CVE-2026-22991 involves the libceph library's free_choose_arg_map() function, which may dereference a NULL pointer if its caller fails after a partial allocation. Specifically, in decode_choose_args(), if allocation of arg_map->args fails, free_choose_arg_map() is called while arg_map->size is non-zero, causing iteration over a NULL pointer and potential kernel crash. This issue has been fixed by adding pointer checks before iteration to prevent NULL pointer dereference. The vulnerability is part of a broader set of Linux kernel fixes addressing multiple subsystems and security issues. The CVSS 3.1 score is 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating network exploitable with no privileges required, causing high impact on availability but no confidentiality or integrity impact. Ubuntu has released patched kernel versions for various distributions and platforms, requiring system reboot and recompilation of kernel modules.
Potential Impact
The vulnerability can cause a denial of service by triggering a NULL pointer dereference in the Linux kernel, leading to system crashes. There is no direct impact on confidentiality or integrity. The flaw is exploitable remotely without privileges or user interaction, increasing risk of disruption. No known exploits in the wild have been reported. The issue is part of multiple kernel security fixes addressing various subsystems.
Mitigation Recommendations
A patch is available and included in official Linux kernel updates distributed by Ubuntu. Users should update to the fixed kernel versions as listed in the Ubuntu security notices USN-8096-1 and USN-8096-2. After updating, a system reboot is required to apply the changes. Due to an ABI change, recompilation and reinstallation of all third-party kernel modules is necessary. No other mitigations are required as the issue is resolved by the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-22991
- 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: 6a5b63752d1edb114c8b4b28
Added to database: 07/18/2026, 11:28:53 UTC
Last enriched: 08/22/2026, 21:49:19 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 8
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