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vuln-cve/data/2024/40xxx/CVE-2024-40900.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2024-40900",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-07-12T12:17:45.579Z",
"datePublished": "2024-07-12T12:20:42.192Z",
"dateUpdated": "2026-08-05T11:33:52.424Z"
},
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},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: remove requests from xarray during flushing requests\n\nEven with CACHEFILES_DEAD set, we can still read the requests, so in the\nfollowing concurrency the request may be used after it has been freed:\n\n mount | daemon_thread1 | daemon_thread2\n------------------------------------------------------------\n cachefiles_ondemand_init_object\n cachefiles_ondemand_send_req\n REQ_A = kzalloc(sizeof(*req) + data_len)\n wait_for_completion(&REQ_A->done)\n cachefiles_daemon_read\n cachefiles_ondemand_daemon_read\n // close dev fd\n cachefiles_flush_reqs\n complete(&REQ_A->done)\n kfree(REQ_A)\n xa_lock(&cache->reqs);\n cachefiles_ondemand_select_req\n req->msg.opcode != CACHEFILES_OP_READ\n // req use-after-free !!!\n xa_unlock(&cache->reqs);\n xa_destroy(&cache->reqs)\n\nHence remove requests from cache->reqs when flushing them to avoid\naccessing freed requests."
}
],
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{
"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 vulnerability is reached through local file access on an erofs/fscache on-demand mount and `read()` on the `/dev/cachefiles` character device; no network or adjacent-network data path is involved.\nAC:L - The attacker controls all sides of the race — pending requests are created on demand by repeated reads of uncached ranges, the flush is inducible via cache-backing I/O errors or daemon teardown, and the daemon's `read()` loop is permanently armed by design, so the window can be hit repeatedly with retries costing nothing.\nPR:L - An unprivileged local user on a host using erofs-on-demand (container lazy image loading) supplies the freed request by reading cached files and sprays the freed slab slot; the CAP_SYS_ADMIN daemon is the victim racer running by design, not a capability the attacker needs.\nUI:N - No victim action is required — the cachefiles daemon is already blocked in `read()` on `/dev/cachefiles` as part of normal operation, and the flush is triggered by the attacker's own activity or routine daemon teardown.\nS:U - The corruption and its consequences are confined to the kernel's own security authority; this is a standard local kernel compromise with no VM, IOMMU, or hypervisor boundary crossed.\nC:H - The freed `cachefiles_req` is re-read and `copy_to_user(_buffer, msg, msg->len)` copies freed-slab contents to userspace with a length taken from the freed object, and the controlled `req->object` pointer chain yields further arbitrary kernel reads.\nI:H - After heap-spraying the freed allocation, `cachefiles_ondemand_set_object_reopening(object)` writes through the attacker-controlled pointer and `queue_work(fscache_wq, &info->ondemand_work)` executes a `work_struct.func` at an attacker-chosen address, giving arbitrary write and control-flow hijack.\nA:H - The slab use-after-free reliably oopses the kernel — KASAN-confirmed slab-use-after-free with a wild pointer dereference in the daemon read path — and can be retriggered at will, panicking the system."
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}
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"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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"versionType": "original_commit_for_fix"
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{
"url": "https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013"
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"title": "cachefiles: remove requests from xarray during flushing requests",
"x_generator": {
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"adp": [
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"title": "CVE Program Container",
"references": [
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"shortName": "CVE",
"dateUpdated": "2025-11-03T21:57:27.388Z"
}
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{
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"other": {
"type": "ssvc",
"content": {
"id": "CVE-2024-40900",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
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],
"version": "2.0.3",
"timestamp": "2024-09-10T17:06:34.508297Z"
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"title": "CISA ADP Vulnrichment",
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}
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