Answer in brief
CVE-2026-74344 records a Unknown severity vulnerability in bpf: Clear rb node linkage when freeing bpf_rb_root. 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.
A CVSS score is not reported in the current record. 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 | >=9c395c1b99bd23f74bc628fa000480c49593d17f <2eb39de4962f842d653e96818ae372665cd481fd || >=9c395c1b99bd23f74bc628fa000480c49593d17f <574612793bed416f6c05fe7c9b50e9eb0441997e || >=9c395c1b99bd23f74bc628fa000480c49593d17f <4a7910ee060d8ce55612f5b3cc267f3a265a3cec || 1d0675957d35ac5e514073481beda62e4e1e2ec5 || >=6.2.15 <6.3 | 2eb39de4962f842d653e96818ae372665cd481fd, 574612793bed416f6c05fe7c9b50e9eb0441997e, 4a7910ee060d8ce55612f5b3cc267f3a265a3cec, 6.3 |
| Linux/Linuxgeneric | 6.3 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Clear rb node linkage when freeing bpf_rb_root bpf_rb_root_free() detaches the root by copying the current rb_root_cached and then replacing the live root with RB_ROOT_CACHED. It then walks the copied root and drops each object contained in the tree. This leaves the rb node state intact while dropping the object. If the object is refcounted and survives the drop, its bpf_rb_node_kern still contains an owner pointer to the freed root and stale rb tree linkage. If a later bpf_rb_root allocation reuses the same address, bpf_rbtree_remove() can incorrectly pass the owner check and call rb_erase_cached() on a node whose rb pointers belong to the old tree. Mirror the list draining behavior by marking nodes as busy while the root is being detached, then clear the rb node and release the owner before dropping the containing object. This makes surviving nodes unowned and safe to reject from remove or accept for a later add.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74344 records a Unknown severity vulnerability in bpf: Clear rb node linkage when freeing bpf_rb_root. 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.
A CVSS score is not reported in the current record. 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 | >=9c395c1b99bd23f74bc628fa000480c49593d17f <2eb39de4962f842d653e96818ae372665cd481fd || >=9c395c1b99bd23f74bc628fa000480c49593d17f <574612793bed416f6c05fe7c9b50e9eb0441997e || >=9c395c1b99bd23f74bc628fa000480c49593d17f <4a7910ee060d8ce55612f5b3cc267f3a265a3cec || 1d0675957d35ac5e514073481beda62e4e1e2ec5 || >=6.2.15 <6.3 | 2eb39de4962f842d653e96818ae372665cd481fd, 574612793bed416f6c05fe7c9b50e9eb0441997e, 4a7910ee060d8ce55612f5b3cc267f3a265a3cec, 6.3 |
| Linux/Linuxgeneric | 6.3 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Clear rb node linkage when freeing bpf_rb_root bpf_rb_root_free() detaches the root by copying the current rb_root_cached and then replacing the live root with RB_ROOT_CACHED. It then walks the copied root and drops each object contained in the tree. This leaves the rb node state intact while dropping the object. If the object is refcounted and survives the drop, its bpf_rb_node_kern still contains an owner pointer to the freed root and stale rb tree linkage. If a later bpf_rb_root allocation reuses the same address, bpf_rbtree_remove() can incorrectly pass the owner check and call rb_erase_cached() on a node whose rb pointers belong to the old tree. Mirror the list draining behavior by marking nodes as busy while the root is being detached, then clear the rb node and release the owner before dropping the containing object. This makes surviving nodes unowned and safe to reject from remove or accept for a later add.
Quoted source text, attributed separately from HOL analysis.