{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-38580", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-38580" ], "published": "2024-06-19T13:37:58Z", "summary": "epoll: be better about file lifetimes", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nepoll: be better about file lifetimes\n\nepoll can call out to vfs_poll() with a file pointer that may race with\nthe last 'fput()'. That would make f_count go down to zero, and while\nthe ep->mtx locking means that the resulting file pointer tear-down will\nbe blocked until the poll returns, it means that f_count is already\ndead, and any use of it won't actually get a reference to the file any\nmore: it's dead regardless.\n\nMake sure we have a valid ref on the file pointer before we call down to\nvfs_poll() from the epoll routines.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": 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"upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.33" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-38580" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - The vulnerability is reached purely through local syscalls \u2014 epoll_ctl(EPOLL_CTL_ADD) to register a pollable fd, epoll_wait() to drive ep_send_events()\u2192ep_item_poll(), and close() on the registered fd from a second thread. No network input is involved.\nAC:L - The attacker controls both sides of the race (one thread spins on close() of the registered fd, another spins on epoll_wait()), so the window can be hit repeatedly and indefinitely until won; syzbot produced a reproducer. Nothing depends on conditions outside attacker influence.\nPR:L - Only an ordinary unprivileged local user is needed \u2014 epoll requires no capabilities at all, and dma-buf fds are obtainable without privilege via /dev/dma_heap/system on Android or DRM render nodes (/dev/dri/renderD128, PRIME_HANDLE_TO_FD) on desktop/server, all reachable from inside containers and app sandboxes.\nUI:N - The attacker performs every step itself from its own threads; no action by any other user or victim process is required.\nS:U - The corruption is confined to kernel memory within the same security authority \u2014 this is a standard local kernel privilege-escalation primitive, not a VM, IOMMU, or hypervisor boundary crossing.\nC:H - vfs_poll() runs on a struct file with f_count already zero, and the resulting refcount underflow frees the file while it is still referenced, yielding a use-after-free on a SLAB_TYPESAFE_BY_RCU slot that is instantly reallocated to another struct file; reading through the stale file (f_cred, f_path, private_data) gives arbitrary kernel memory and other processes' file contents.\nI:H - The double __fput()/double file_free() plus stray refcount decrement on a live, reallocated struct file is the classic DirtyCred-style write primitive \u2014 the attacker can force premature release of a victim's file and substitute its own, enabling arbitrary file/credential overwrite and full control-flow hijack.\nA:H - syzbot's observed manifestation is a kernel general protection fault in __ep_remove (fs/eventpoll.c:825, NULL file->f_ep), and the double-free of struct file, dentry and vfsmount reliably panics the machine, so an unprivileged user can crash the kernel at will." } } }