275 lines
14 KiB
JSON
275 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-38580",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-06-18T19:36:34.927Z",
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"datePublished": "2024-06-19T13:37:37.840Z",
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"dateUpdated": "2026-08-05T11:32:56.809Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:32:56.809Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is reached purely through local syscalls — epoll_ctl(EPOLL_CTL_ADD) to register a pollable fd, epoll_wait() to drive ep_send_events()→ep_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 — 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 — 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 — 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/eventpoll.c"
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],
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"versions": [
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"status": "affected",
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"status": "affected",
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/eventpoll.c"
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],
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"versions": [
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{
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"version": "2.6.12",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.12",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.161",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.93",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.33",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.8.12",
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"lessThanOrEqual": "6.8.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.9",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-38580",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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"dateUpdated": "2024-09-11T17:34:55.453Z"
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