CVE-2025-71162
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-25

Last updated on: 2026-02-26

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: tegra-adma: Fix use-after-free A use-after-free bug exists in the Tegra ADMA driver when audio streams are terminated, particularly during XRUN conditions. The issue occurs when the DMA buffer is freed by tegra_adma_terminate_all() before the vchan completion tasklet finishes accessing it. The race condition follows this sequence: 1. DMA transfer completes, triggering an interrupt that schedules the completion tasklet (tasklet has not executed yet) 2. Audio playback stops, calling tegra_adma_terminate_all() which frees the DMA buffer memory via kfree() 3. The scheduled tasklet finally executes, calling vchan_complete() which attempts to access the already-freed memory Since tasklets can execute at any time after being scheduled, there is no guarantee that the buffer will remain valid when vchan_complete() runs. Fix this by properly synchronizing the virtual channel completion: - Calling vchan_terminate_vdesc() in tegra_adma_stop() to mark the descriptors as terminated instead of freeing the descriptor. - Add the callback tegra_adma_synchronize() that calls vchan_synchronize() which kills any pending tasklets and frees any terminated descriptors. Crash logs: [ 337.427523] BUG: KASAN: use-after-free in vchan_complete+0x124/0x3b0 [ 337.427544] Read of size 8 at addr ffff000132055428 by task swapper/0/0 [ 337.427562] Call trace: [ 337.427564] dump_backtrace+0x0/0x320 [ 337.427571] show_stack+0x20/0x30 [ 337.427575] dump_stack_lvl+0x68/0x84 [ 337.427584] print_address_description.constprop.0+0x74/0x2b8 [ 337.427590] kasan_report+0x1f4/0x210 [ 337.427598] __asan_load8+0xa0/0xd0 [ 337.427603] vchan_complete+0x124/0x3b0 [ 337.427609] tasklet_action_common.constprop.0+0x190/0x1d0 [ 337.427617] tasklet_action+0x30/0x40 [ 337.427623] __do_softirq+0x1a0/0x5c4 [ 337.427628] irq_exit+0x110/0x140 [ 337.427633] handle_domain_irq+0xa4/0xe0 [ 337.427640] gic_handle_irq+0x64/0x160 [ 337.427644] call_on_irq_stack+0x20/0x4c [ 337.427649] do_interrupt_handler+0x7c/0x90 [ 337.427654] el1_interrupt+0x30/0x80 [ 337.427659] el1h_64_irq_handler+0x18/0x30 [ 337.427663] el1h_64_irq+0x7c/0x80 [ 337.427667] cpuidle_enter_state+0xe4/0x540 [ 337.427674] cpuidle_enter+0x54/0x80 [ 337.427679] do_idle+0x2e0/0x380 [ 337.427685] cpu_startup_entry+0x2c/0x70 [ 337.427690] rest_init+0x114/0x130 [ 337.427695] arch_call_rest_init+0x18/0x24 [ 337.427702] start_kernel+0x380/0x3b4 [ 337.427706] __primary_switched+0xc0/0xc8
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Meta Information
Published
2026-01-25
Last Modified
2026-02-26
Generated
2026-06-16
AI Q&A
2026-01-25
EPSS Evaluated
2026-06-15
NVD
CVE-2025-71162
Affected Vendors & Products
Showing 11 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.13 (inc) to 6.18.7 (exc)
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.11 (inc) to 5.15.199 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.162 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.122 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.67 (exc)
linux linux_kernel From 4.7 (inc) to 5.10.249 (exc)
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Exploitability
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability is a use-after-free bug in the Tegra ADMA driver of the Linux kernel. It occurs when audio streams are terminated, especially during XRUN conditions. The issue arises because the DMA buffer is freed before a scheduled tasklet finishes accessing it, leading to the tasklet accessing freed memory. This race condition happens when a DMA transfer completes and schedules a tasklet, then audio playback stops and frees the buffer, and finally the tasklet runs and accesses the freed buffer, causing a use-after-free error.

Impact Analysis

This vulnerability can cause system crashes or instability due to the use-after-free condition in the kernel's DMA engine driver. It may lead to kernel bugs, memory corruption, or unexpected behavior when audio streams are terminated, potentially affecting system reliability and security.

Detection Guidance

This vulnerability can be detected by monitoring kernel crash logs for use-after-free errors related to the Tegra ADMA driver, specifically messages from KASAN (Kernel Address Sanitizer) indicating use-after-free in vchan_complete. You can check the kernel logs using commands like 'dmesg | grep -i kasan' or 'journalctl -k | grep -i kasan' to find relevant crash reports. There are no specific network detection commands since this is a kernel driver issue.

Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a version where the Tegra ADMA driver use-after-free bug is fixed. The fix includes proper synchronization of the virtual channel completion by calling vchan_terminate_vdesc() in tegra_adma_stop() and adding tegra_adma_synchronize() to kill pending tasklets and free terminated descriptors. Until the patch is applied, avoid terminating audio streams abruptly during XRUN conditions to reduce the chance of triggering the race condition.

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