In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: Fix null-ptr-deref in l2cap_sock_resume_cb()
syzbot reported null-ptr-deref in l2cap_sock_resume_cb(). [0]
l2cap_sock_resume_cb() has a similar problem that was fixed by commit 1bff51ea59a9 ("Bluetooth: fix use-after-free error in lock_sock_nested()").
Since both l2cap_sock_kill() and l2cap_sock_resume_cb() are executed under l2cap_sock_resume_cb(), we can avoid the issue simply by checking if chan->data is NULL.
Let's not access to the killed socket in l2cap_sock_resume_cb().
[0]: BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:82 [inline] BUG: KASAN: null-ptr-deref in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] BUG: KASAN: null-ptr-deref in l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711 Write of size 8 at addr 0000000000000570 by task kworker/u9:0/52
CPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted 6.16.0-rc4-syzkaller-g7482bb149b9f #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: hci0 hci_rx_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_report+0x58/0x84 mm/kasan/report.c:524 kasan_report+0xb0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_write include/linux/instrumented.h:82 [inline] clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] l2cap_sock_resume_cb+0xb4/0x17c net/bluetooth/l2cap_sock.c:1711 l2cap_security_cfm+0x524/0xea0 net/bluetooth/l2cap_core.c:7357 hci_auth_cfm include/net/bluetooth/hci_core.h:2092 [inline] hci_auth_complete_evt+0x2e8/0xa4c net/bluetooth/hci_event.c:3514 hci_event_func net/bluetooth/hci_event.c:7511 [inline] hci_event_packet+0x650/0xe9c net/bluetooth/hci_event.c:7565 hci_rx_work+0x320/0xb18 net/bluetooth/hci_core.c:4070 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.1Upgrade linux | Jul 31, 2025 | Jul 31, 2025 |
| Oracle_linux | — | Upgrade kernel-uek | Oct 14, 2025 | Jul 28, 2025 |
| Redhat_linux | — | No solution exists | Jul 31, 2025 | Jul 28, 2025 |
| Suse | — | Upgrade dtb-socionextUpgrade kernel-debug-vdsoUpgrade dtb-renesasUpgrade kernel-rt-develUpgrade kernel-rt-extraUpgrade gfs2-kmp-defaultUpgrade kernel-rt_debugUpgrade kernel-default-base-rebuildUpgrade kernel-obs-buildUpgrade kernel-azure-vdsoUpgrade dtb-armUpgrade dtb-rockchipUpgrade kernel-rt_debug-vdsoUpgrade kselftests-kmp-defaultUpgrade kernel-64kb-extraUpgrade reiserfs-kmp-azureUpgrade dlm-kmp-azureUpgrade cluster-md-kmp-defaultUpgrade dtb-amdUpgrade dtb-sprdUpgrade kernel-defaultUpgrade dlm-kmp-defaultUpgrade kernel-rt-vdsoUpgrade kernel-devel-rtUpgrade cluster-md-kmp-64kbUpgrade kernel-docsUpgrade reiserfs-kmp-rtUpgrade kernel-syms-rtUpgrade ocfs2-kmp-azureUpgrade dtb-mediatekUpgrade dlm-kmp-rtUpgrade kernel-default-livepatch-develUpgrade kernel-azureUpgrade kernel-default-baseUpgrade kernel-default-manUpgrade reiserfs-kmp-defaultUpgrade dtb-nvidiaUpgrade dtb-xilinxUpgrade kernel-rt-livepatch-develUpgrade kselftests-kmp-rtUpgrade gfs2-kmp-rtUpgrade kernel-kvmsmall-vdsoUpgrade kernel-default-develUpgrade kernel-default-livepatchUpgrade kernel-64kb-optionalUpgrade gfs2-kmp-azureUpgrade dtb-freescaleUpgrade dtb-broadcomUpgrade ocfs2-kmp-defaultUpgrade ocfs2-kmp-64kbUpgrade kernel-kvmsmallUpgrade kernel-source-vanillaUpgrade kernel-docs-htmlUpgrade dtb-marvellUpgrade kernel-default-extraUpgrade kernel-debugUpgrade gfs2-kmp-64kbUpgrade reiserfs-kmp-64kbUpgrade kernel-source-rtUpgrade dtb-caviumUpgrade kselftests-kmp-64kbUpgrade kselftests-kmp-azureUpgrade kernel-debug-develUpgrade kernel-64kbUpgrade ocfs2-kmp-rtUpgrade dtb-apmUpgrade dlm-kmp-64kbUpgrade kernel-obs-qaUpgrade dtb-appleUpgrade dtb-hisiliconUpgrade kernel-64kb-develUpgrade kernel-sourceUpgrade kernel-kvmsmall-develUpgrade kernel-default-vdsoUpgrade kernel-azure-develUpgrade dtb-amlogicUpgrade kernel-syms-azureUpgrade cluster-md-kmp-azureUpgrade kernel-default-optionalUpgrade dtb-allwinnerUpgrade dtb-lgUpgrade dtb-exynosUpgrade kernel-source-azureUpgrade kernel-devel-azureUpgrade dtb-amazonUpgrade kernel-rt-optionalUpgrade kernel-azure-optionalUpgrade kernel-azure-extraUpgrade dtb-qcomUpgrade dtb-alteraUpgrade kernel-zfcpdumpUpgrade kernel-macrosUpgrade cluster-md-kmp-rtUpgrade kernel-rtUpgrade kernel-symsUpgrade kernel-rt_debug-develUpgrade kernel-rt-livepatchUpgrade kernel-devel | Dec 5, 2025 | Aug 18, 2025 |
| Ubuntu | — | Upgrade linux-image-aws-64k-5.15Upgrade linux-image-aws-fips-6.8Upgrade linux-image-oracleUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-virtual-6.8Upgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-6.8.1-1041-realtimeUpgrade linux-image-oem-22.04bUpgrade linux-image-6.14.0-1018-raspiUpgrade linux-image-kvmUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-6.8.0-100-lowlatency-64kUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-oem-6.14Upgrade linux-image-6.8.0-100-lowlatencyUpgrade linux-image-6.14.0-1020-gcpUpgrade linux-image-generic-5.15Upgrade linux-image-6.14.0-1017-oracle-64kUpgrade linux-image-aws-64k-6.14Upgrade linux-image-oracle-6.8Upgrade linux-image-6.14.0-1020-gcp-64kUpgrade linux-image-aws-64k-6.8Upgrade linux-image-6.14.0-1017-oracleUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-gcp-fips-5.15Upgrade linux-image-generic-64k-6.14Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-5.15.0-163-lowlatency-64kUpgrade linux-image-5.15.0-1049-nvidia-tegraUpgrade linux-image-6.14.0-1017-azureUpgrade linux-image-oracle-6.14Upgrade linux-image-6.8.0-1046-nvidia-lowlatencyUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-5.15.0-1080-gkeopUpgrade linux-image-azure-fipsUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-5.15.0-1097-aws-64kUpgrade linux-image-5.15.0-163-lowlatencyUpgrade linux-image-gcp-64k-6.14Upgrade linux-image-azure-cvmUpgrade linux-image-azure-fips-6.8Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-1046-nvidiaUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1047-gcp-64kUpgrade linux-image-6.8.0-1046-aws-64kUpgrade linux-image-6.8.0-1030-gkeopUpgrade linux-image-5.15.0-1101-azureUpgrade linux-image-ibmUpgrade linux-image-aws-6.14Upgrade linux-image-lowlatency-6.8Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-100-genericUpgrade linux-image-5.15.0-1089-kvmUpgrade linux-image-5.15.0-1091-ibmUpgrade linux-image-6.8.0-1043-oracle-64kUpgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-1047-raspiUpgrade linux-image-virtual-6.14Upgrade linux-image-azure-5.15Upgrade linux-image-generic-6.14Upgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-generic-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-5.15.0-163-generic-64kUpgrade linux-image-6.8.0-1023-xilinxUpgrade linux-image-6.8.0-100-generic-64kUpgrade linux-image-6.8.0-1047-gcp-fipsUpgrade linux-image-ibm-6.8Upgrade linux-image-5.15.0-1097-gcp-fipsUpgrade linux-image-6.14.0-1016-oemUpgrade linux-image-5.15.0-1092-nvidiaUpgrade linux-image-oracle-5.15Upgrade linux-image-realtimeUpgrade linux-image-virtual-5.15Upgrade linux-image-5.15.0-1089-intel-iot-realtimeUpgrade linux-image-6.14.0-36-genericUpgrade linux-image-6.8.0-1043-gke-64kUpgrade linux-image-gke-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-gcp-fipsUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.14.0-36-generic-64kUpgrade linux-image-6.8.0-1046-aws-fipsUpgrade linux-image-awsUpgrade linux-image-oracle-64k-6.14Upgrade linux-image-5.15.0-1038-nvidia-tegra-igx-rtUpgrade linux-image-5.15.0-1094-oracleUpgrade linux-image-raspi-nolpaeUpgrade linux-image-raspiUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-6.14.0-1017-aws-64kUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-aws-lts-22.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-2037-raspi-realtimeUpgrade linux-image-fips-6.8Upgrade linux-image-oem-20.04dUpgrade linux-image-6.8.0-1044-ibmUpgrade linux-image-nvidia-tegra-igxUpgrade linux-image-gcp-5.15Upgrade linux-image-aws-fips-5.15Upgrade linux-image-gcp-6.8Upgrade linux-image-gcp-64kUpgrade linux-image-generic-64k-5.15Upgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-genericUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-kvm-5.15Upgrade linux-image-intel-iotg-5.15Upgrade linux-image-6.8.0-1046-azure-fipsUpgrade linux-image-oem-22.04dUpgrade linux-image-nvidia-6.8Upgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1046-awsUpgrade linux-image-6.8.0-1043-gkeUpgrade linux-image-5.15.0-1061-xilinx-zynqmpUpgrade linux-image-realtime-5.15Upgrade linux-image-azureUpgrade linux-image-6.8.0-1046-azureUpgrade linux-image-nvidia-tegra-igx-rt-5.15Upgrade linux-image-oem-20.04cUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-nvidia-tegra-5.15Upgrade linux-image-lowlatency-64kUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-6.8.0-1047-gcpUpgrade linux-image-intel-iotgUpgrade linux-image-ibm-5.15Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-gke-64k-6.8Upgrade linux-image-oem-20.04Upgrade linux-image-virtual-hwe-20.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-nvidia-tegra-rt-5.15Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-gkeopUpgrade linux-image-nvidia-5.15Upgrade linux-image-oem-20.04bUpgrade linux-image-azure-lts-22.04Upgrade linux-image-gkeop-5.15Upgrade linux-image-5.15.0-1091-raspiUpgrade linux-image-5.15.0-1038-nvidia-tegra-igxUpgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-1046-nvidia-lowlatency-64kUpgrade linux-image-6.14.0-1016-realtimeUpgrade linux-image-gkeUpgrade linux-image-5.15.0-1097-awsUpgrade linux-image-raspi-6.14Upgrade linux-image-gkeop-6.8Upgrade linux-image-generic-64kUpgrade linux-image-fipsUpgrade linux-image-azure-6.8Upgrade linux-image-6.8.0-1046-nvidia-64kUpgrade linux-image-6.14.0-1017-awsUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-oem-24.04aUpgrade linux-image-nvidia-tegra-igx-rtUpgrade linux-image-aws-6.8Upgrade linux-image-raspi-6.8Upgrade linux-image-5.15.0-1093-gkeUpgrade linux-image-xilinx-6.8Upgrade linux-image-realtime-6.8.1Upgrade linux-image-intelUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-oracle-64kUpgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-generic-lpae-5.15Upgrade linux-image-fips-5.15Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-gke-5.15Upgrade linux-image-5.15.0-1092-nvidia-lowlatencyUpgrade linux-image-5.15.0-1092-intel-iotgUpgrade linux-image-5.15.0-163-fipsUpgrade linux-image-5.15.0-1097-gcpUpgrade linux-image-gcpUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-azure-6.14Upgrade linux-image-6.8.0-1043-oracleUpgrade linux-image-5.15.0-163-generic-lpaeUpgrade linux-image-5.15.0-1049-nvidia-tegra-rtUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-realtime-6.14Upgrade linux-image-raspi-5.15Upgrade linux-image-oem-22.04Upgrade linux-image-nvidia-tegraUpgrade linux-image-gke-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-5.15.0-163-genericUpgrade linux-image-5.15.0-1101-azure-fipsUpgrade linux-image-gcp-6.14Upgrade linux-image-azure-fips-5.15Upgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-aws-5.15Upgrade linux-image-6.8.0-100-fipsUpgrade linux-image-5.15.0-1097-aws-fipsUpgrade linux-image-5.15.0-1096-realtimeUpgrade linux-image-xilinxUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-virtualUpgrade linux-image-oem-24.04Upgrade linux-image-oem-22.04cUpgrade linux-image-oem-22.04aUpgrade linux-image-nvidiaUpgrade linux-image-lowlatency-5.15Upgrade linux-image-lowlatencyUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-5.15.0-1102-azureUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-aws-64kUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-nvidia-tegra-igx-5.15Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gcp-64k-6.8 | Jul 31, 2025 | Jul 28, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 19, 2025 | Jul 28, 2025 |
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