Linux aws: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock… (CVE-2026-31500)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock btintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET and Intel exception-info retrieval) without holding hci_req_sync_lock(). This lets it race against hci_dev_do_close() -> btintel_shutdown_combined(), which also runs __hci_cmd_sync() under the same lock. When both paths manipulate hdev->req_status/req_rsp concurrently, the close path may free the response skb first, and the still-running hw_error path hits a slab-use-after-free in kfree_skb(). Wrap the whole recovery sequence in hci_req_sync_lock/unlock so it is serialized with every other synchronous HCI command issuer. Below is the data race report and the kasan report: BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined read of hdev->req_rsp at net/bluetooth/hci_sync.c:199 by task kworker/u17:1/83: __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200 __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223 btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254 hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030 write/free by task ioctl/22580: btintel_shutdown_combined+0xd0/0x360 drivers/bluetooth/btintel.c:3648 hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246 hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526 BUG: KASAN: slab-use-after-free in sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202 Read of size 4 at addr ffff888144a738dc by task kworker/u17:1/83: __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200 __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223 btintel_hw_error+0x186/0x670 drivers/bluetooth/btintel.c:260
AI Analysis
Technical Summary
CVE-2026-31500 is a race condition vulnerability in the Linux kernel's Bluetooth btintel driver. The function btintel_hw_error() issues two synchronous HCI commands (__hci_cmd_sync()) without holding the hci_req_sync_lock(), racing against the close path (hci_dev_do_close() -> btintel_shutdown_combined()) which also uses __hci_cmd_sync() under the same lock. This concurrency leads to a use-after-free condition on the response skb in kfree_skb(), causing a potential kernel memory corruption. The fix serializes the entire recovery sequence with hci_req_sync_lock/unlock to prevent concurrent manipulation of shared resources. This vulnerability affects linux-aws kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions listed. The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating local attack vector with low complexity, requiring low privileges, no user interaction, and resulting in high confidentiality, integrity, and availability impact. The vulnerability is patched in updated kernel versions as per Ubuntu security notices USN-8567-1 and USN-8574-1.
Potential Impact
Successful exploitation can lead to kernel memory corruption due to a use-after-free condition in the Bluetooth subsystem, potentially causing system crashes or allowing an attacker with local privileges to compromise system confidentiality, integrity, and availability. The CVSS score of 7.8 reflects high impact on all three security properties. However, exploitation requires local access with low privileges and no user interaction is needed. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in linux-aws kernel versions 6.8.0-1061.64~22.04.1 and later. Users should update their Linux kernel to these or newer versions to remediate the vulnerability. After applying the update, a system reboot is required to activate the fix. Due to an ABI change in the kernel update, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the vendor's update instructions as detailed in the Ubuntu security notices USN-8567-1 and USN-8574-1.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock… (CVE-2026-31500)
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock btintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET and Intel exception-info retrieval) without holding hci_req_sync_lock(). This lets it race against hci_dev_do_close() -> btintel_shutdown_combined(), which also runs __hci_cmd_sync() under the same lock. When both paths manipulate hdev->req_status/req_rsp concurrently, the close path may free the response skb first, and the still-running hw_error path hits a slab-use-after-free in kfree_skb(). Wrap the whole recovery sequence in hci_req_sync_lock/unlock so it is serialized with every other synchronous HCI command issuer. Below is the data race report and the kasan report: BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined read of hdev->req_rsp at net/bluetooth/hci_sync.c:199 by task kworker/u17:1/83: __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200 __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223 btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254 hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030 write/free by task ioctl/22580: btintel_shutdown_combined+0xd0/0x360 drivers/bluetooth/btintel.c:3648 hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246 hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526 BUG: KASAN: slab-use-after-free in sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202 Read of size 4 at addr ffff888144a738dc by task kworker/u17:1/83: __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200 __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223 btintel_hw_error+0x186/0x670 drivers/bluetooth/btintel.c:260
CVSS v3.1
Score 7.8high
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-31500 is a race condition vulnerability in the Linux kernel's Bluetooth btintel driver. The function btintel_hw_error() issues two synchronous HCI commands (__hci_cmd_sync()) without holding the hci_req_sync_lock(), racing against the close path (hci_dev_do_close() -> btintel_shutdown_combined()) which also uses __hci_cmd_sync() under the same lock. This concurrency leads to a use-after-free condition on the response skb in kfree_skb(), causing a potential kernel memory corruption. The fix serializes the entire recovery sequence with hci_req_sync_lock/unlock to prevent concurrent manipulation of shared resources. This vulnerability affects linux-aws kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions listed. The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating local attack vector with low complexity, requiring low privileges, no user interaction, and resulting in high confidentiality, integrity, and availability impact. The vulnerability is patched in updated kernel versions as per Ubuntu security notices USN-8567-1 and USN-8574-1.
Potential Impact
Successful exploitation can lead to kernel memory corruption due to a use-after-free condition in the Bluetooth subsystem, potentially causing system crashes or allowing an attacker with local privileges to compromise system confidentiality, integrity, and availability. The CVSS score of 7.8 reflects high impact on all three security properties. However, exploitation requires local access with low privileges and no user interaction is needed. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in linux-aws kernel versions 6.8.0-1061.64~22.04.1 and later. Users should update their Linux kernel to these or newer versions to remediate the vulnerability. After applying the update, a system reboot is required to activate the fix. Due to an ABI change in the kernel update, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the vendor's update instructions as detailed in the Ubuntu security notices USN-8567-1 and USN-8574-1.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31500
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b622f2d1edb114c88ad2b
Added to database: 07/18/2026, 11:23:28 UTC
Last enriched: 08/01/2026, 05:39:09 UTC
Last updated: 09/10/2026, 19:36:53 UTC
Views: 27
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