{"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"}}}}