In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type… (CVE-2026-52954)
In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]
AI Analysis
Technical Summary
The vulnerability exists in the Linux kernel's libceph code that processes CEPH_MSG_OSD_MAP messages containing CRUSH maps with choose_args. When two crush_choose_arg_maps share the same choose_args_index, the insertion into the choose_args rbtree triggers an assertion failure, causing a kernel BUG and crash. The fix replaces the asserting insertion with a non-asserting one and rejects messages that fail insertion, preventing kernel crashes from malformed or corrupted messages.
Potential Impact
This vulnerability can cause a denial of service by crashing the Linux kernel when processing specially crafted CEPH_MSG_OSD_MAP messages with duplicate choose_args_index values. There is no impact on confidentiality or integrity reported, only availability due to kernel crashes.
Mitigation Recommendations
A patch is available that fixes this vulnerability by changing the rbtree insertion method and rejecting malformed messages. Users should update their Linux kernel to versions including this fix. The affected versions are all Linux kernel versions prior to 5.15.0-1112.119~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2, 5.15.0-186.196~20.04.1, and 5.15.0-1106.110~20.04.1. Patch status is confirmed by the description of the fix; users should apply the official kernel updates provided by their distribution.
In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type… (CVE-2026-52954)
Description
In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]
CVSS v3.1
Score 7.5high
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in the Linux kernel's libceph code that processes CEPH_MSG_OSD_MAP messages containing CRUSH maps with choose_args. When two crush_choose_arg_maps share the same choose_args_index, the insertion into the choose_args rbtree triggers an assertion failure, causing a kernel BUG and crash. The fix replaces the asserting insertion with a non-asserting one and rejects messages that fail insertion, preventing kernel crashes from malformed or corrupted messages.
Potential Impact
This vulnerability can cause a denial of service by crashing the Linux kernel when processing specially crafted CEPH_MSG_OSD_MAP messages with duplicate choose_args_index values. There is no impact on confidentiality or integrity reported, only availability due to kernel crashes.
Mitigation Recommendations
A patch is available that fixes this vulnerability by changing the rbtree insertion method and rejecting malformed messages. Users should update their Linux kernel to versions including this fix. The affected versions are all Linux kernel versions prior to 5.15.0-1112.119~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2, 5.15.0-186.196~20.04.1, and 5.15.0-1106.110~20.04.1. Patch status is confirmed by the description of the fix; users should apply the official kernel updates provided by their distribution.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-52954
- Osv Schema Version
- 1.7.0
- Aliases
- []
- 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","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a016a91ae9bcd3f802c3c
Added to database: 07/17/2026, 10:18:18 UTC
Last enriched: 07/30/2026, 15:40:13 UTC
Last updated: 07/31/2026, 19:30:19 UTC
Views: 2
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