CVE-2025-40032
In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: pci-epf-test: Add NULL check for DMA channels before release The fields dma_chan_tx and dma_chan_rx of the struct pci_epf_test can be NULL even after EPF initialization. Then it is prudent to check that they have non-NULL values before releasing the channels. Add the checks in pci_epf_test_clean_dma_chan(). Without the checks, NULL pointer dereferences happen and they can lead to a kernel panic in some cases: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000050 Call trace: dma_release_channel+0x2c/0x120 (P) pci_epf_test_epc_deinit+0x94/0xc0 [pci_epf_test] pci_epc_deinit_notify+0x74/0xc0 tegra_pcie_ep_pex_rst_irq+0x250/0x5d8 irq_thread_fn+0x34/0xb8 irq_thread+0x18c/0x2e8 kthread+0x14c/0x210 ret_from_fork+0x10/0x20 [mani: trimmed the stack trace]
Affected versions
Linux kernel versions
5.7
and later are affected. Fixed in
6.1.157,
6.6.113,
6.12.54,
6.17.3,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40032 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
-
PatchKernel patch commithttps://git.kernel.org/stable/c/0c5ce6b6ccc22d486cc7239ed908cb0ae5363a7b
-
PatchKernel patch commithttps://git.kernel.org/stable/c/57f7fb0d1ac28540c0f6405c829bb9c3b89d8dba
-
PatchKernel patch commithttps://git.kernel.org/stable/c/6411f840a9b5c47c00ca8e004733de232553870d
Frequently asked questions
-
What is CVE-2025-40032?
CVE-2025-40032 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.7 onward and has been patched in 6.1.157, 6.6.113, 6.12.54 and others. CVE-2025-40032 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
-
Is there a patch available for CVE-2025-40032?
Yes — CVE-2025-40032 has been patched. Fixed versions include 6.1.157, 6.6.113, 6.12.54 and others. If you are running Linux kernel 5.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
-
Is CVE-2025-40032 actively exploited?
No — CVE-2025-40032 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.