Answer in brief
CVE-2026-53358 records a High severity (CVSS 8.8) vulnerability in Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (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 8.8. 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), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (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 | >=3df91ea20e744344100b10ae69a17211fcf5b207 <3634cbdc2eb414b69ffa752ddbe5e0458518e321 || >=3df91ea20e744344100b10ae69a17211fcf5b207 <e1c100e2d61bd8c718b7d91fe3e050780a9bf72d || >=3df91ea20e744344100b10ae69a17211fcf5b207 <deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9 || >=3df91ea20e744344100b10ae69a17211fcf5b207 <89dec92041717b027216e110599e4f6d6c921b79 || >=3df91ea20e744344100b10ae69a17211fcf5b207 <50dfec218808b148ab4247b1858031b7a32015c5 || >=3df91ea20e744344100b10ae69a17211fcf5b207 <859d3ace791ed878ae9ba5522c7844d960da8f88 || >=3df91ea20e744344100b10ae69a17211fcf5b207 <7555fd885a0603f50e49a655850a1f2bd8a25398 || >=3df91ea20e744344100b10ae69a17211fcf5b207 <8c8e620467a7b51562dbcefbd1f09f288d7d710d | 3634cbdc2eb414b69ffa752ddbe5e0458518e321, e1c100e2d61bd8c718b7d91fe3e050780a9bf72d, deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9, 89dec92041717b027216e110599e4f6d6c921b79, 50dfec218808b148ab4247b1858031b7a32015c5, 859d3ace791ed878ae9ba5522c7844d960da8f88, 7555fd885a0603f50e49a655850a1f2bd8a25398, 8c8e620467a7b51562dbcefbd1f09f288d7d710d |
| Linux/Linuxgeneric | 3.4 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Jul 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 2, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen() l2cap_chan_close() removes the channel from conn->chan_l, which must be done under conn->lock. cleanup_listen() runs under the parent sk_lock, so acquiring conn->lock would invert the established conn->lock -> chan->lock -> sk_lock order. Instead of calling l2cap_chan_close() directly, schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously. The timeout handler already acquires conn->lock and chan->lock in the correct order. The timer is only armed when chan->conn is still set: if it is already NULL, l2cap_conn_del() has already processed this channel (l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb), so there is nothing left to do. If l2cap_conn_del() races in after the timer is armed, __clear_chan_timer() inside l2cap_chan_del() cancels it; if the timer has already fired, the handler returns harmlessly because chan->conn was cleared.
Quoted source text, attributed separately from HOL analysis.