EUVD-2026-39845
GHSA-fpxp-9g9j-vhm7
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local access with low privileges required; only kernel availability impacted via page fault crash; no confidentiality or integrity impact confirmed.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
soc/tegra: cbb: Fix cross-fabric target timeout lookup
When a fabric receives an error interrupt, the error may have occurred on a different fabric. The target timeout lookup was using the wrong base address (cbb->regs) with offsets from a different fabric's target map, causing a kernel page fault.
Unable to handle kernel paging request at virtual address ffff80000954cc00 pc : tegra234_cbb_get_tmo_slv+0xc/0x28 Call trace: tegra234_cbb_get_tmo_slv+0xc/0x28 print_err_notifier+0x6c0/0x7d0 tegra234_cbb_isr+0xe4/0x1b4
Add tegra234_cbb_get_fabric() to look up the correct fabric device using fab_id, and use its base address for accessing target timeout registers.
AnalysisAI
Kernel page fault in the Linux kernel's Tegra234 Control Backbone (CBB) driver crashes affected NVIDIA Tegra234-based systems when a cross-fabric error interrupt triggers incorrect register address resolution. The tegra234_cbb_get_tmo_slv() function uses the receiving fabric's base address (cbb->regs) with register offsets derived from a different fabric's target map, producing an invalid virtual address dereference (ffff80000954cc00) and a kernel panic. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) physical hardware running an NVIDIA Tegra234 SoC (Jetson AGX Orin or Drive AGX Orin - x86 and non-Tegra ARM systems are entirely unaffected); (2) an affected Linux kernel version (introduced at commit 25de5c8fe080, unfixed prior to 6.18.33/7.0.10/7.1); (3) local authenticated access with at minimum low-privilege credentials (PR:L per CVSS vector - remote exploitation is not possible, AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 3.1 scores this 5.5 Medium (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), reflecting a local denial-of-service with no confidentiality or integrity impact - consistent with the observable kernel page fault outcome. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local low-privilege user on a Jetson AGX Orin or Drive AGX Orin system running an unpatched kernel induces or waits for a cross-fabric Control Backbone error interrupt - arising from an interconnect fault or deliberately induced hardware stress. When the interrupt fires, the CBB ISR calls `tegra234_cbb_get_tmo_slv` with the wrong fabric base address, dereferencing virtual address `ffff80000954cc00`, triggering a kernel page fault and system crash. … |
| Remediation | Upgrade the kernel to a patched stable release: Linux 6.18.33, 7.0.10, or 7.1, all of which incorporate the corrective commits available at https://git.kernel.org/stable/. … Detailed patch versions, workarounds, and compensating controls in full report. |
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