Answer in brief
CVE-2024-43892 records a High severity (CVSS 7.8) vulnerability in memcg: protect concurrent access to mem_cgroup_idr. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=73f576c04b9410ed19660f74f97521bee6e1c546 <912736a0435ef40e6a4ae78197ccb5553cb80b05 || >=73f576c04b9410ed19660f74f97521bee6e1c546 <e6cc9ff2ac0b5df9f25eb790934c3104f6710278 || >=73f576c04b9410ed19660f74f97521bee6e1c546 <56fd70f4aa8b82199dbe7e99366b1fd7a04d86fb || >=73f576c04b9410ed19660f74f97521bee6e1c546 <37a060b64ae83b76600d187d76591ce488ab836b || >=73f576c04b9410ed19660f74f97521bee6e1c546 <51c0b1bb7541f8893ec1accba59eb04361a70946 || >=73f576c04b9410ed19660f74f97521bee6e1c546 <9972605a238339b85bd16b084eed5f18414d22db || 8627c7750a66a46d56d3564e1e881aa53764497c || db70cd18d3da727a3a59694de428a9e41c620de7 || >=4.4.18 <4.5 || >=4.6.6 <4.7 | 912736a0435ef40e6a4ae78197ccb5553cb80b05, e6cc9ff2ac0b5df9f25eb790934c3104f6710278, 56fd70f4aa8b82199dbe7e99366b1fd7a04d86fb, 37a060b64ae83b76600d187d76591ce488ab836b, 51c0b1bb7541f8893ec1accba59eb04361a70946, 9972605a238339b85bd16b084eed5f18414d22db, 4.5, 4.7 |
| Linux/Linuxgeneric | 4.7 | Not reported |
Published upstream
Aug 26, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: memcg: protect concurrent access to mem_cgroup_idr Commit 73f576c04b94 ("mm: memcontrol: fix cgroup creation failure after many small jobs") decoupled the memcg IDs from the CSS ID space to fix the cgroup creation failures. It introduced IDR to maintain the memcg ID space. The IDR depends on external synchronization mechanisms for modifications. For the mem_cgroup_idr, the idr_alloc() and idr_replace() happen within css callback and thus are protected through cgroup_mutex from concurrent modifications. However idr_remove() for mem_cgroup_idr was not protected against concurrency and can be run concurrently for different memcgs when they hit their refcnt to zero. Fix that. We have been seeing list_lru based kernel crashes at a low frequency in our fleet for a long time. These crashes were in different part of list_lru code including list_lru_add(), list_lru_del() and reparenting code. Upon further inspection, it looked like for a given object (dentry and inode), the super_block's list_lru didn't have list_lru_one for the memcg of that object. The initial suspicions were either the object is not allocated through kmem_cache_alloc_lru() or somehow memcg_list_lru_alloc() failed to allocate list_lru_one() for a memcg but returned success. No evidence were found for these cases. Looking more deeply, we started seeing situations where valid memcg's id is not present in mem_cgroup_idr and in some cases multiple valid memcgs have same id and mem_cgroup_idr is pointing to one of them. So, the most reasonable explanation is that these situations can happen due to race between multiple idr_remove() calls or race between idr_alloc()/idr_replace() and idr_remove(). These races are causing multiple memcgs to acquire the same ID and then offlining of one of them would cleanup list_lrus on the system for all of them. Later access from other memcgs to the list_lru cause crashes due to missing list_lru_one.
Quoted source text, attributed separately from HOL analysis.