In the Linux kernel, the following vulnerability has been resolved:
atm: Release atm_dev_mutex after removing procfs in atm_dev_deregister().
syzbot reported a warning below during atm_dev_register(). [0]
Before creating a new device and procfs/sysfs for it, atm_dev_register() looks up a duplicated device by __atm_dev_lookup(). These operations are done under atm_dev_mutex.
However, when removing a device in atm_dev_deregister(), it releases the mutex just after removing the device from the list that __atm_dev_lookup() iterates over.
So, there will be a small race window where the device does not exist on the device list but procfs/sysfs are still not removed, triggering the splat.
Let's hold the mutex until procfs/sysfs are removed in atm_dev_deregister().
[0]: proc_dir_entry 'atm/atmtcp:0' already registered WARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377 Modules linked in: CPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377 Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 <0f> 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48 RSP: 0018:ffffc9000466fa30 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248 RDX: ffff888026280000 RSI: ffffffff817ae255 RDI: 0000000000000001 RBP: ffff8880232bed48 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888076ed2140 R13: dffffc0000000000 R14: ffff888078a61340 R15: ffffed100edda444 FS: 00007f38b3b0c6c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f38b3bdf953 CR3: 0000000076d58000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> proc_create_data+0xbe/0x110 fs/proc/generic.c:585 atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361 atm_dev_register+0x46d/0x890 net/atm/resources.c:113 atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369 atmtcp_attach drivers/atm/atmtcp.c:403 [inline] atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464 do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159 sock_do_ioctl+0x115/0x280 net/socket.c:1190 sock_ioctl+0x227/0x6b0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f38b3b74459 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f38b3b0c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f38b3bfe318 RCX: 00007f38b3b74459 RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005 RBP: 00007f38b3bfe310 R08: 65732f636f72702f R09: 65732f636f72702f R10: 65732f636f72702f R11: 0000000000000246 R12: 00007f38b3bcb0ac R13: 00007f38b3b0c1a0 R14: 0000200000000200 R15: 00007f38b3bcb03b </TASK>
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.1Upgrade linux | Jul 10, 2025 | Jul 10, 2025 |
| Oracle_linux | — | Upgrade kernel-uek | Sep 10, 2025 | Jul 9, 2025 |
| Redhat_linux | — | No solution exists | Jul 10, 2025 | Jul 9, 2025 |
| Suse | — | Upgrade kernel-default-base-rebuildUpgrade kernel-devel-azureUpgrade kernel-rt_debugUpgrade kernel-rtUpgrade kernel-obs-buildUpgrade dtb-exynosUpgrade dtb-qcomUpgrade kernel-rt-vdsoUpgrade kernel-rt-livepatch-develUpgrade reiserfs-kmp-64kbUpgrade dlm-kmp-64kbUpgrade dlm-kmp-rtUpgrade dtb-amlogicUpgrade kselftests-kmp-64kbUpgrade kernel-sourceUpgrade dtb-sprdUpgrade kernel-rt-extraUpgrade kernel-kvmsmall-vdsoUpgrade kernel-azure-develUpgrade dtb-nvidiaUpgrade kernel-default-manUpgrade kselftests-kmp-azureUpgrade dtb-broadcomUpgrade kernel-debug-vdsoUpgrade kernel-defaultUpgrade ocfs2-kmp-64kbUpgrade kernel-macrosUpgrade kernel-rt_debug-develUpgrade kernel-docs-htmlUpgrade kernel-source-vanillaUpgrade kernel-rt-optionalUpgrade dtb-marvellUpgrade kernel-kvmsmallUpgrade cluster-md-kmp-defaultUpgrade kernel-syms-azureUpgrade kernel-default-livepatchUpgrade kernel-syms-rtUpgrade cluster-md-kmp-64kbUpgrade kernel-azure-vdsoUpgrade kernel-rt_debug-vdsoUpgrade dtb-rockchipUpgrade kernel-source-rtUpgrade kernel-azureUpgrade kernel-azure-optionalUpgrade dtb-socionextUpgrade kernel-docsUpgrade dlm-kmp-azureUpgrade kernel-zfcpdumpUpgrade kernel-kvmsmall-develUpgrade kernel-default-develUpgrade kernel-64kbUpgrade kernel-source-azureUpgrade kselftests-kmp-defaultUpgrade kernel-develUpgrade kernel-default-vdsoUpgrade kernel-default-optionalUpgrade kernel-64kb-optionalUpgrade dtb-xilinxUpgrade dtb-appleUpgrade dtb-amdUpgrade ocfs2-kmp-azureUpgrade kselftests-kmp-rtUpgrade kernel-debugUpgrade dtb-renesasUpgrade gfs2-kmp-64kbUpgrade dtb-hisiliconUpgrade reiserfs-kmp-defaultUpgrade ocfs2-kmp-defaultUpgrade kernel-default-livepatch-develUpgrade kernel-rt-develUpgrade gfs2-kmp-defaultUpgrade dtb-mediatekUpgrade dtb-alteraUpgrade dlm-kmp-defaultUpgrade cluster-md-kmp-azureUpgrade kernel-symsUpgrade kernel-rt-livepatchUpgrade kernel-64kb-extraUpgrade dtb-allwinnerUpgrade cluster-md-kmp-rtUpgrade kernel-devel-rtUpgrade kernel-default-baseUpgrade kernel-azure-extraUpgrade kernel-64kb-develUpgrade dtb-armUpgrade dtb-apmUpgrade dtb-amazonUpgrade kernel-default-extraUpgrade dtb-lgUpgrade kernel-debug-develUpgrade dtb-caviumUpgrade reiserfs-kmp-azureUpgrade kernel-obs-qaUpgrade dtb-freescaleUpgrade reiserfs-kmp-rtUpgrade ocfs2-kmp-rtUpgrade gfs2-kmp-rtUpgrade gfs2-kmp-azure | Dec 5, 2025 | Sep 12, 2025 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1046-awsUpgrade linux-image-nvidia-tegra-rt-5.15Upgrade linux-image-5.15.0-1096-azureUpgrade linux-image-gcp-fips-5.15Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-aws-fipsUpgrade linux-image-generic-6.8Upgrade linux-image-realtime-6.8.1Upgrade linux-image-5.15.0-1096-azure-fipsUpgrade linux-image-6.8.0-1043-gkeUpgrade linux-image-5.15.0-156-lowlatency-64kUpgrade linux-image-nvidiaUpgrade linux-image-gke-64kUpgrade linux-image-oracle-6.8Upgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-1047-gcp-64kUpgrade linux-image-nvidia-tegraUpgrade linux-image-oracle-6.14Upgrade linux-image-gcp-6.14Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-azure-lts-22.04Upgrade linux-image-6.8.0-1047-gcp-fipsUpgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-100-lowlatencyUpgrade linux-image-6.8.0-1046-aws-fipsUpgrade linux-image-6.8.0-1046-nvidia-lowlatency-64kUpgrade linux-image-5.15.0-156-generic-64kUpgrade linux-image-5.15.0-1085-intel-iot-realtimeUpgrade linux-image-5.15.0-1092-gcp-fipsUpgrade linux-image-5.15.0-1034-nvidia-tegra-igxUpgrade linux-image-5.15.0-1092-realtimeUpgrade linux-image-realtime-5.15Upgrade linux-image-6.14.0-34-generic-64kUpgrade linux-image-5.15.0-156-lowlatencyUpgrade linux-image-nvidia-lowlatency-5.15Upgrade linux-image-gcp-64kUpgrade linux-image-gcp-fipsUpgrade linux-image-azure-nvidia-6.14Upgrade linux-image-gke-64k-6.8Upgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1051-azureUpgrade linux-image-azureUpgrade linux-image-intel-iot-realtime-5.15Upgrade linux-image-5.15.0-156-fipsUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1046-azureUpgrade linux-image-lowlatency-6.8Upgrade linux-image-aws-6.8Upgrade linux-image-oracle-64k-6.14Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-raspi-5.15Upgrade linux-image-realtime-hwe-24.04Upgrade linux-image-aws-lts-22.04Upgrade linux-image-lowlatencyUpgrade linux-image-aws-fips-5.15Upgrade linux-image-kvm-5.15Upgrade linux-image-azure-5.15Upgrade linux-image-fipsUpgrade linux-image-genericUpgrade linux-image-generic-6.14Upgrade linux-image-oem-22.04cUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-5.15.0-1086-raspiUpgrade linux-image-lowlatency-64kUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-6.8.0-1043-oracle-64kUpgrade linux-image-nvidia-5.15Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-6.8.0-1046-nvidia-lowlatencyUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-generic-5.15Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-6.14.0-1015-oracle-64kUpgrade linux-image-5.15.0-1088-kvmUpgrade linux-image-raspi-6.8Upgrade linux-image-6.8.0-1023-xilinxUpgrade linux-image-intelUpgrade linux-image-fips-6.8Upgrade linux-image-6.8.0-1043-gke-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-5.15.0-1086-ibmUpgrade linux-image-5.15.0-1087-nvidia-lowlatencyUpgrade linux-image-virtual-6.14Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-gke-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-100-genericUpgrade linux-image-6.8.0-1047-raspiUpgrade linux-image-6.8.0-1043-oracleUpgrade linux-image-generic-64k-5.15Upgrade linux-image-xilinx-6.8Upgrade linux-image-6.14.0-1015-aws-64kUpgrade linux-image-gkeopUpgrade linux-image-5.15.0-1056-xilinx-zynqmpUpgrade linux-image-virtual-6.8Upgrade linux-image-oracle-5.15Upgrade linux-image-gcp-64k-6.14Upgrade linux-image-nvidia-tegra-5.15Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-gke-5.15Upgrade linux-image-oem-22.04bUpgrade linux-image-azure-lts-24.04Upgrade linux-image-ibm-classicUpgrade linux-image-intel-iotg-5.15Upgrade linux-image-nvidia-64kUpgrade linux-image-raspi-6.14Upgrade linux-image-raspiUpgrade linux-image-azure-nvidiaUpgrade linux-image-6.14.0-1014-oemUpgrade linux-image-6.8.0-1044-ibmUpgrade linux-image-generic-64k-6.8Upgrade linux-image-6.8.0-100-lowlatency-64kUpgrade linux-image-6.8.1-1041-realtimeUpgrade linux-image-azure-fipsUpgrade linux-image-ibmUpgrade linux-image-aws-6.14Upgrade linux-image-6.8.0-100-fipsUpgrade linux-image-azure-fips-5.15Upgrade linux-image-gcp-5.15Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-generic-64k-6.14Upgrade linux-image-azure-fips-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-oem-24.04bUpgrade linux-image-azure-6.14Upgrade linux-image-gkeop-5.15Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-6.14.0-1015-oracleUpgrade linux-image-6.14.0-1014-realtimeUpgrade linux-image-5.15.0-1075-gkeopUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-oem-24.04aUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-5.15.0-1089-gkeUpgrade linux-image-5.15.0-1045-nvidia-tegraUpgrade linux-image-ibm-5.15Upgrade linux-image-5.15.0-156-genericUpgrade linux-image-awsUpgrade linux-image-6.8.0-1046-aws-64kUpgrade linux-image-azure-6.8Upgrade linux-image-6.14.0-1007-azure-nvidiaUpgrade linux-image-5.15.0-1087-intel-iotgUpgrade linux-image-virtual-5.15Upgrade linux-image-virtualUpgrade linux-image-oem-24.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-gcp-lts-22.04Upgrade linux-image-fips-5.15Upgrade linux-image-azure-cvmUpgrade linux-image-xilinx-zynqmp-5.15Upgrade linux-image-6.14.0-1016-raspiUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-6.8.0-1046-nvidia-64kUpgrade linux-image-6.14.0-34-genericUpgrade linux-image-6.14.0-1015-awsUpgrade linux-image-5.15.0-1092-awsUpgrade linux-image-xilinxUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-oracleUpgrade linux-image-oem-6.14Upgrade linux-image-aws-64k-6.14Upgrade linux-image-nvidia-tegra-igxUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-aws-64k-lts-22.04Upgrade linux-image-oem-24.04cUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-generic-lpae-5.15Upgrade linux-image-gcp-6.8Upgrade linux-image-lowlatency-5.15Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-5.15.0-1090-oracleUpgrade linux-image-kvmUpgrade linux-image-aws-5.15Upgrade linux-image-6.8.0-1046-nvidiaUpgrade linux-image-6.8.0-1030-gkeopUpgrade linux-image-6.8.0-100-generic-64kUpgrade linux-image-5.15.0-1092-aws-fipsUpgrade linux-image-6.14.0-1018-gcp-64kUpgrade linux-image-lowlatency-64k-5.15Upgrade linux-image-intel-iotgUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-6.8.0-1046-azure-fipsUpgrade linux-image-6.8.0-1047-gcpUpgrade linux-image-6.14.0-1014-azureUpgrade linux-image-nvidia-tegra-igx-5.15Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-raspi-nolpaeUpgrade linux-image-nvidia-tegra-igx-rt-5.15Upgrade linux-image-nvidia-tegra-igx-rtUpgrade linux-image-realtime-6.14Upgrade linux-image-gkeUpgrade linux-image-gcpUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-gcp-64k-6.8Upgrade linux-image-aws-64kUpgrade linux-image-6.8.0-2037-raspi-realtimeUpgrade linux-image-5.15.0-1034-nvidia-tegra-igx-rtUpgrade linux-image-aws-fips-6.8Upgrade linux-image-6.14.0-1018-gcpUpgrade linux-image-5.15.0-156-generic-lpaeUpgrade linux-image-aws-64k-5.15Upgrade linux-image-5.15.0-1092-gcpUpgrade linux-image-5.15.0-1092-aws-64kUpgrade linux-image-5.15.0-1045-nvidia-tegra-rtUpgrade linux-image-5.15.0-1087-nvidiaUpgrade linux-image-realtimeUpgrade linux-image-oem-22.04dUpgrade linux-image-nvidia-hwe-22.04 | Jul 14, 2025 | Jul 9, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 19, 2025 | Jul 9, 2025 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub