Answer in brief
CVE-2025-40028 records a High severity (CVSS 7.8) vulnerability in binder: fix double-free in dbitmap. 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 | >=15d9da3f818cae676f822a04407d3c17b53357d2 <c301ec61ce6f16e21a36b99225ca8a20c1591e10 || >=15d9da3f818cae676f822a04407d3c17b53357d2 <0390633979969c54c0ce6a198d6f45cdbe2c84b1 || >=15d9da3f818cae676f822a04407d3c17b53357d2 <b781e5635a3398e2b64440371233c2c5102cd6cb || >=15d9da3f818cae676f822a04407d3c17b53357d2 <3ebcd3460cad351f198c39c6edb4af519a0ed934 | c301ec61ce6f16e21a36b99225ca8a20c1591e10, 0390633979969c54c0ce6a198d6f45cdbe2c84b1, b781e5635a3398e2b64440371233c2c5102cd6cb, 3ebcd3460cad351f198c39c6edb4af519a0ed934 |
| Linux/Linuxgeneric | 6.11 | Not reported |
Published upstream
Oct 28, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 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: binder: fix double-free in dbitmap A process might fail to allocate a new bitmap when trying to expand its proc->dmap. In that case, dbitmap_grow() fails and frees the old bitmap via dbitmap_free(). However, the driver calls dbitmap_free() again when the same process terminates, leading to a double-free error: ================================================================== BUG: KASAN: double-free in binder_proc_dec_tmpref+0x2e0/0x55c Free of addr ffff00000b7c1420 by task kworker/9:1/209 CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: events binder_deferred_func Call trace: kfree+0x164/0x31c binder_proc_dec_tmpref+0x2e0/0x55c binder_deferred_func+0xc24/0x1120 process_one_work+0x520/0xba4 [...] Allocated by task 448: __kmalloc_noprof+0x178/0x3c0 bitmap_zalloc+0x24/0x30 binder_open+0x14c/0xc10 [...] Freed by task 449: kfree+0x184/0x31c binder_inc_ref_for_node+0xb44/0xe44 binder_transaction+0x29b4/0x7fbc binder_thread_write+0x1708/0x442c binder_ioctl+0x1b50/0x2900 [...] ================================================================== Fix this issue by marking proc->map NULL in dbitmap_free().
Quoted source text, attributed separately from HOL analysis.