Answer in brief
CVE-2026-63945 records a High severity (CVSS 7.8) vulnerability in Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <35f68f36d9883d56dec21cf85f7556d4657fc393 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <996c2104d0726a8fe584f85b3d6327197374a348 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <bc08c15746f25f41dd0508b25780d1e84acbb2ef || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5 || >=ccf74f2390d60a2f9a75ef496d2564abb478f46a <4b5f8e608749b7e8fa386c6e4301cf9272595859 | d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa, 35f68f36d9883d56dec21cf85f7556d4657fc393, 996c2104d0726a8fe584f85b3d6327197374a348, bc08c15746f25f41dd0508b25780d1e84acbb2ef, 51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5, 4b5f8e608749b7e8fa386c6e4301cf9272595859 |
| Linux/Linuxgeneric | 6.0 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 26, 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: Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock iso_sock_close() calls iso_sock_clear_timer() before acquiring lock_sock(sk). iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the socket lock held: if (!iso_pi(sk)->conn) return; cancel_delayed_work(&iso_pi(sk)->conn->timeout_work); Concurrently, iso_conn_del() executes under lock_sock(sk) and calls iso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in the final reference to the connection being dropped: CPU0 CPU1 ---- ---- iso_sock_clear_timer() if (conn != NULL) ... lock_sock(sk) iso_chan_del() iso_pi(sk)->conn = NULL cancel_delayed_work(conn) /* NULL deref or UAF */ iso_pi(sk)->conn is not stable across the unlock window, causing a NULL pointer dereference or use-after-free. Serialize iso_sock_clear_timer() with the socket lock by moving it inside lock_sock()/release_sock(), matching the pattern used in iso_conn_del() and all other call sites.
Quoted source text, attributed separately from HOL analysis.