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In the Linux kernel, the following vulnerability has been resolved:
can: m_can: m_can_class_allocate_dev(): initialize spin lock on device probe
The spin lock tx_handling_spinlock in struct m_can_classdev is not being initialized. This leads the following spinlock bad magic complaint from the kernel, eg. when trying to send CAN frames with cansend from can-utils:
| BUG: spinlock bad magic on CPU#0, cansend/95 | lock: 0xff60000002ec1010, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0 | CPU: 0 UID: 0 PID: 95 Comm: cansend Not tainted 6.15.0-rc3-00032-ga79be02bba5c #5 NONE | Hardware name: MachineWare SIM-V (DT) | Call Trace: | [<ffffffff800133e0>] dump_backtrace+0x1c/0x24 | [<ffffffff800022f2>] show_stack+0x28/0x34 | [<ffffffff8000de3e>] dump_stack_lvl+0x4a/0x68 | [<ffffffff8000de70>] dump_stack+0x14/0x1c | [<ffffffff80003134>] spin_dump+0x62/0x6e | [<ffffffff800883ba>] do_raw_spin_lock+0xd0/0x142 | [<ffffffff807a6fcc>] _raw_spin_lock_irqsave+0x20/0x2c | [<ffffffff80536dba>] m_can_start_xmit+0x90/0x34a | [<ffffffff806148b0>] dev_hard_start_xmit+0xa6/0xee | [<ffffffff8065b730>] sch_direct_xmit+0x114/0x292 | [<ffffffff80614e2a>] __dev_queue_xmit+0x3b0/0xaa8 | [<ffffffff8073b8fa>] can_send+0xc6/0x242 | [<ffffffff8073d1c0>] raw_sendmsg+0x1a8/0x36c | [<ffffffff805ebf06>] sock_write_iter+0x9a/0xee | [<ffffffff801d06ea>] vfs_write+0x184/0x3a6 | [<ffffffff801d0a88>] ksys_write+0xa0/0xc0 | [<ffffffff801d0abc>] __riscv_sys_write+0x14/0x1c | [<ffffffff8079ebf8>] do_trap_ecall_u+0x168/0x212 | [<ffffffff807a830a>] handle_exception+0x146/0x152
Initializing the spin lock in m_can_class_allocate_dev solves that problem.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Suse | — | Upgrade kernel-default-develUpgrade kernel-azureUpgrade kernel-kvmsmall-develUpgrade kernel-azure-extraUpgrade kernel-docs-htmlUpgrade kernel-source-vanillaUpgrade kernel-kvmsmall-vdsoUpgrade kernel-default-livepatchUpgrade kernel-default-vdsoUpgrade kernel-64kbUpgrade kernel-64kb-extraUpgrade kernel-source-azureUpgrade kernel-sourceUpgrade kernel-develUpgrade kernel-devel-azureUpgrade kernel-default-extraUpgrade kernel-azure-vdsoUpgrade kernel-obs-qaUpgrade kernel-docsUpgrade kernel-azure-develUpgrade kernel-symsUpgrade kernel-macrosUpgrade kernel-defaultUpgrade kernel-kvmsmallUpgrade kernel-64kb-develUpgrade kernel-zfcpdump | Dec 5, 2025 | Dec 5, 2025 |
| Ubuntu | — | Upgrade linux-image-6.14.0-1011-aws-64kUpgrade linux-image-oem-24.04cUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-generic-64k-6.14Upgrade linux-image-6.14.0-1010-azureUpgrade linux-image-oracle-6.14Upgrade linux-image-6.14.0-1014-gcp-64kUpgrade linux-image-awsUpgrade linux-image-6.14.0-1010-oemUpgrade linux-image-aws-64k-6.14Upgrade linux-image-oem-6.14Upgrade linux-image-oracleUpgrade linux-image-6.14.0-1011-awsUpgrade linux-image-virtualUpgrade linux-image-6.14.0-1014-gcpUpgrade linux-image-realtime-6.14Upgrade linux-image-6.14.0-28-generic-64kUpgrade linux-image-realtimeUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gcpUpgrade linux-image-oracle-64k-6.14Upgrade linux-image-aws-6.14Upgrade linux-image-6.14.0-1012-raspiUpgrade linux-image-raspi-6.14Upgrade linux-image-generic-64kUpgrade linux-image-6.14.0-1011-oracle-64kUpgrade linux-image-6.14.0-1010-realtimeUpgrade linux-image-raspiUpgrade linux-image-oracle-64kUpgrade linux-image-6.14.0-28-genericUpgrade linux-image-genericUpgrade linux-image-virtual-6.14Upgrade linux-image-azureUpgrade linux-image-6.14.0-1011-oracleUpgrade linux-image-gcp-64kUpgrade linux-image-gcp-6.14Upgrade linux-image-gcp-64k-6.14Upgrade linux-image-generic-6.14Upgrade linux-image-aws-64kUpgrade linux-image-oem-24.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oem-24.04aUpgrade linux-image-azure-6.14 | Jun 26, 2025 | May 29, 2025 |
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