{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-39785",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T07:20:57.131Z",
        "datePublished": "2025-09-11T16:56:34.955Z",
        "dateUpdated": "2026-08-05T12:05:06.443Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:05:06.443Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/hisilicon/hibmc: fix irq_request()'s irq name variable is local\n\nThe local variable is passed in request_irq (), and there will be use\nafter free problem, which will make request_irq failed. Using the global\nirq name instead of it to fix."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The stale `irqaction->name` pointer is dereferenced by `show_interrupts()` when userspace reads the world-readable `/proc/interrupts`, which requires local system access. There is no network-facing consumer of this data.\nAC:L - The dangling pointer is installed unconditionally at driver probe on every affected system, so a single `cat /proc/interrupts` deterministically dereferences freed stack memory; the attacker can additionally groom the recycled VMAP task stack with fork/exit churn to control or unmap the target.\nPR:L - `/proc/interrupts` is created with mode 0444, so any unprivileged local user — including one confined to a container with `/proc` mounted — can trigger the read with no capabilities. No authentication beyond a normal shell is needed.\nUI:N - The attacker only reads a procfs file; no victim action, mount, or file-open by another user is required. The vulnerable state is established automatically at boot when the hibmc PCI device probes.\nS:U - The stale read and its consequences are confined to the kernel's own security authority on the affected host, with no crossing of a VM, IOMMU, or hypervisor boundary.\nC:H - `seq_printf(\"%s\", action->name)` walks memory unbounded until a NUL byte, dumping arbitrary kernel stack contents into a world-readable file — leaking kernel pointers (KASLR/heap defeat) and, because VMAP task stacks are recycled into other tasks, residual data from other and potentially privileged processes. This is not a small bounded read.\nI:H - The commit fixes a use-after-free: a dangling pointer is left embedded in the long-lived `irqaction` structure, and its target is attacker-groomable recycled kernel stack memory whose contents are then consumed by kernel formatting code and emitted into procfs and dmesg. Per use-after-free scoring this is treated as High.\nA:H - If the freed stack was `vfree_atomic()`d or the unbounded string walk crosses a vmap guard page, the fault occurs inside `show_interrupts()` while `desc->lock` is held as a raw spinlock with IRQs disabled — an oops that leaves the IRQ descriptor lock permanently held, deadlocking subsequent IRQ and procfs access, and a full panic under `panic_on_oops`. Any unprivileged user, or routine readers like irqbalance and monitoring agents, can trigger it repeatedly."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c"
                    ],
                    "versions": [
                        {
                            "version": "b11bc1ae46587f3563c47078e605184f18e7fa57",
                            "lessThan": "06d261a085a11600f5b577bb56a65fb2c3e57d0a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b11bc1ae46587f3563c47078e605184f18e7fa57",
                            "lessThan": "8bed4ec42a4e0dc8113172696ff076d1eb6d8bcb",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.16.4",
                            "lessThanOrEqual": "6.16.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.16.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.17"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/06d261a085a11600f5b577bb56a65fb2c3e57d0a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8bed4ec42a4e0dc8113172696ff076d1eb6d8bcb"
                }
            ],
            "title": "drm/hisilicon/hibmc: fix irq_request()'s irq name variable is local",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}