CVE-2025-71162: Linux kernel · dmaengine: tegra-adma: Fix use-after-free
Affects Linux kernelSource GCVE Database
Not known to be exploited · CVSS 7.8 High · fixed in 5.15.0-1105.112~20.04.1 : patch Linux kernel soon.
Data as of 26 Oct 2026, 14:05 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1105.112~20.04.1, 5.15.0-1110.119~20.04.1, 5.15.0-1106.115~20.04.1 +59
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 25 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 25.10linuxpkg:deb/ubuntu/linux@6.17.0-40.40?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws@6.17.0-1019.19?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure@6.17.0-1020.20?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde@6.17.0-1017.17?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp@6.17.0-1020.22?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle@6.17.0-1018.18?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available and should be applied by updating to the fixed Linux kernel package versions provided by Ubuntu for NVIDIA Tegra systems. After updating, a system reboot is required to complete the remediation. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the Ubuntu security notices USN-8034-1 and USN-8034-2 for detailed update instructions. No additional mitigation is required beyond applying the official fixes.
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
References
- ubuntu.com/security/CVE-2025-71162 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-71162 (opens in a new tab)
- git.kernel.org/linus/2efd07a7c36949e6fa36a69183df24d368bf9e96 (opens in a new tab)
- git.kernel.org/stable/c/2efd07a7c36949e6fa36a69183df24d368bf9e96 (opens in a new tab)
- git.kernel.org/stable/c/be655c3736b3546f39bc8116ffbf2a3b6cac96c4 (opens in a new tab)
- git.kernel.org/stable/c/cb2c9c4bb1322cc3c9984ad17db8cdd2663879ca (opens in a new tab)
- ubuntu.com/security/notices/USN-8034-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8034-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8186-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8188-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-5 (opens in a new tab)
- ubuntu.com/security/notices/USN-8243-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8180-6 (opens in a new tab)
- ubuntu.com/security/notices/USN-8275-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8278-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8289-1 (opens in a new tab)