In the Linux kernel, the following vulnerability has been resolved:
ALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt
I got a null-ptr-defer error report when I do the following tests on the qemu platform:
make defconfig and CONFIG_PARPORT=m, CONFIG_PARPORT_PC=m, CONFIG_SND_MTS64=m
Then making test scripts: cat>test_mod1.sh<<EOF modprobe snd-mts64 modprobe snd-mts64 EOF
Executing the script, perhaps several times, we will get a null-ptr-defer report, as follow:
syzkaller:~# ./test_mod.sh snd_mts64: probe of snd_mts64.0 failed with error -5 modprobe: ERROR: could not insert 'snd_mts64': No such device BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP PTI CPU: 0 PID: 205 Comm: modprobe Not tainted 6.1.0-rc8-00588-g76dcd734eca2 #6 Call Trace: <IRQ> snd_mts64_interrupt+0x24/0xa0 [snd_mts64] parport_irq_handler+0x37/0x50 [parport] __handle_irq_event_percpu+0x39/0x190 handle_irq_event_percpu+0xa/0x30 handle_irq_event+0x2f/0x50 handle_edge_irq+0x99/0x1b0 __common_interrupt+0x5d/0x100 common_interrupt+0xa0/0xc0 </IRQ> <TASK> asm_common_interrupt+0x22/0x40 RIP: 0010:_raw_write_unlock_irqrestore+0x11/0x30 parport_claim+0xbd/0x230 [parport] snd_mts64_probe+0x14a/0x465 [snd_mts64] platform_probe+0x3f/0xa0 really_probe+0x129/0x2c0 __driver_probe_device+0x6d/0xc0 driver_probe_device+0x1a/0xa0 __device_attach_driver+0x7a/0xb0 bus_for_each_drv+0x62/0xb0 __device_attach+0xe4/0x180 bus_probe_device+0x82/0xa0 device_add+0x550/0x920 platform_device_add+0x106/0x220 snd_mts64_attach+0x2e/0x80 [snd_mts64] port_check+0x14/0x20 [parport] bus_for_each_dev+0x6e/0xc0 __parport_register_driver+0x7c/0xb0 [parport] snd_mts64_module_init+0x31/0x1000 [snd_mts64] do_one_initcall+0x3c/0x1f0 do_init_module+0x46/0x1c6 load_module+0x1d8d/0x1e10 __do_sys_finit_module+0xa2/0xf0 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Kernel panic - not syncing: Fatal exception in interrupt Rebooting in 1 seconds..
The mts wa not initialized during interrupt, we add check for mts to fix this bug.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
| Ubuntu | — | Upgrade linux-aws-5.15Upgrade linux-oracle-5.4Upgrade linux-azure-4.15Upgrade linux-azure-fdeUpgrade linux-hwe-5.15Upgrade linux-raspi-5.4Upgrade linux-realtimeUpgrade linux-raspiUpgrade linux-gcp-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-iotUpgrade linux-awsUpgrade linux-bluefieldUpgrade linux-gcpUpgrade linux-intel-iot-realtimeUpgrade linux-azureUpgrade linux-nvidia-tegra-5.15Upgrade linux-aws-fipsUpgrade linux-riscv-5.15Upgrade linux-gkeopUpgrade linux-gcp-4.15Upgrade linux-nvidiaUpgrade linux-gcp-5.4Upgrade linux-kvmUpgrade linux-aws-hweUpgrade linuxUpgrade linux-gcp-fipsUpgrade linux-azure-fipsUpgrade linux-azure-5.4Upgrade linux-oracleUpgrade linux-ibm-5.4Upgrade linux-ibmUpgrade linux-hwe-5.4Upgrade linux-aws-5.4Upgrade linux-gkeUpgrade linux-lowlatencyUpgrade linux-hweUpgrade linux-intel-iotg-5.15Upgrade linux-azure-5.15Upgrade linux-oracle-5.15Upgrade linux-fipsUpgrade linux-xilinx-zynqmpUpgrade linux-intel-iotg | Jan 6, 2026 | Dec 24, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 24, 2025 |
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