CVE-2025-71285

/* * PoC / Trigger for CVE-2025-71285 * Vulnerability: Race condition in Linux kernel net: qrtr MHI auto_queue * Impact: NULL pointer dereference, Kernel Panic, Denial of Service * * Analysis: * This vulnerability is triggered during the boot process or driver loading * on vulnerable hardware (e.g., Qcom X1E80100 CRD) when the MHI stack * has 'auto_queue' enabled for the IPCR DL channel. * * Exploitation Logic: * 1. System boots on affected hardware. * 2. MHI controller initializes and enables auto_queue for DL channels. * 3. Data arrives or transfer starts, triggering dl_callback. * 4. If dl_callback runs before qrtr_client_probe() completes initialization, * it accesses a NULL pointer. * * Code Snippet (Conceptual Kernel Trace): * // In vulnerable code: * // mhi_queue() is called by MHI stack immediately. * // dl_callback() fires -> accesses qrtr->ep (which is NULL). * // Result: Kernel Panic. */ // Note: This is a hardware/timing dependent race condition. No specific // user-space exploit code is required; simply booting the vulnerable kernel // on the target hardware can trigger the crash.

{"cve": {"id": "CVE-2025-71285", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:27.613", "lastModified": "2026-05-12T21:25:04.157", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: Drop the MHI auto_queue feature for IPCR DL channels\n\nMHI stack offers the 'auto_queue' feature, which allows the MHI stack to\nauto queue the buffers for the RX path (DL channel). Though this feature\nsimplifies the client driver design, it introduces race between the client\ndrivers and the MHI stack. For instance, with auto_queue, the 'dl_callback'\nfor the DL channel may get called before the client driver is fully probed.\nThis means, by the time the dl_callback gets called, the client driver's\nstructures might not be initialized, leading to NULL ptr dereference.\n\nCurrently, the drivers have to workaround this issue by initializing the\ninternal structures before calling mhi_prepare_for_transfer_autoqueue().\nBut even so, there is a chance that the client driver's internal code path\nmay call the MHI queue APIs before mhi_prepare_for_transfer_autoqueue() is\ncalled, leading to similar NULL ptr dereference. This issue has been\nreported on the Qcom X1E80100 CRD machines affecting boot.\n\nSo to properly fix all these races, drop the MHI 'auto_queue' feature\naltogether and let the client driver (QRTR) manage the RX buffers manually.\nIn the QRTR driver, queue the RX buffers based on the ring length during\nprobe and recycle the buffers in 'dl_callback' once they are consumed. This\nalso warrants removing the setting of 'auto_queue' flag from controller\ndrivers.\n\nCurrently, this 'auto_queue' feature is only enabled for IPCR DL channel.\nSo only the QRTR client driver requires the modification."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.63", "versionEndExcluding": "5.16", "matchCriteriaId": "60ACBB16-9DB7-4B68-AF39-342F3BA4775E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.17", "matchCriteriaId": "9E1D818B-7FC7-4E36-AC6B-517B11C9D765"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/51731792a25cb312ca94cdccfa139eb46de1b2ef", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/7bdff9b9b0c65ac7105416fe3a40686832515e20", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/8c464e00e0754e016816b1860fa9592dcad80eb2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}