321 lines
17 KiB
JSON
321 lines
17 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-2025-21664",
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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": "2024-12-29T08:45:45.732Z",
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"datePublished": "2025-01-21T12:18:19.015Z",
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"dateUpdated": "2026-10-15T21:51:52.113Z"
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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": "2026-08-05T11:53:29.038Z"
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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\ndm thin: make get_first_thin use rcu-safe list first function\n\nThe documentation in rculist.h explains the absence of list_empty_rcu()\nand cautions programmers against relying on a list_empty() ->\nlist_first() sequence in RCU safe code. This is because each of these\nfunctions performs its own READ_ONCE() of the list head. This can lead\nto a situation where the list_empty() sees a valid list entry, but the\nsubsequent list_first() sees a different view of list head state after a\nmodification.\n\nIn the case of dm-thin, this author had a production box crash from a GP\nfault in the process_deferred_bios path. This function saw a valid list\nhead in get_first_thin() but when it subsequently dereferenced that and\nturned it into a thin_c, it got the inside of the struct pool, since the\nlist was now empty and referring to itself. The kernel on which this\noccurred printed both a warning about a refcount_t being saturated, and\na UBSAN error for an out-of-bounds cpuid access in the queued spinlock,\nprior to the fault itself. When the resulting kdump was examined, it\nwas possible to see another thread patiently waiting in thin_dtr's\nsynchronize_rcu.\n\nThe thin_dtr call managed to pull the thin_c out of the active thins\nlist (and have it be the last entry in the active_thins list) at just\nthe wrong moment which lead to this crash.\n\nFortunately, the fix here is straight forward. Switch get_first_thin()\nfunction to use list_first_or_null_rcu() which performs just a single\nREAD_ONCE() and returns NULL if the list is already empty.\n\nThis was run against the devicemapper test suite's thin-provisioning\nsuites for delete and suspend and no regressions were observed."
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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 vulnerable code is the dm-thin pool worker, reached via block I/O to a thin device and via DM device teardown — both require local access to the machine (device file / ioctl), with no network-facing path.\nAC:L - The attacker drives one side of the race continuously (unbounded I/O to the thin device keeps process_deferred_bios re-running) and the removal side is repeatable in a loop, so attempts are unlimited; the commit reports the race firing spontaneously on a production box with no attacker at all.\nPR:L - An unprivileged user with access to a thin volume (container guest, dm device with group/ACL access) supplies the malicious half of the race by flooding deferred bios, while the thin-device teardown is routine automation on LVM-thin/container-storage hosts; with deferred remove armed, an unprivileged holder of the device even triggers thin_dtr directly via close().\nUI:N - No victim action is required — thin volume teardown happens automatically under LVM/container orchestration, and the pool worker runs on its own periodic waker plus attacker-generated I/O.\nS:U - The corruption is confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The type confusion makes the worker treat a kernel text address as a struct pool and read through it, and the garbage qspinlock value causes out-of-bounds per-CPU array indexing (the reported UBSAN OOB access), giving wild out-of-bounds reads that can be leveraged for disclosure.\nI:H - The bogus thin_c overlays struct pool's function-pointer tail, so refcount_inc() and spin_lock_irq() write over live function pointers and list_splice_init() writes through wild list heads — memory corruption of indirect-call targets that is exploitable for control-flow hijack.\nA:H - The bug produced a confirmed general-protection fault in process_deferred_bios on a production system, panicking the kernel and taking down all storage served by the thin pool."
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}
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]
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}
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],
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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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"drivers/md/dm-thin.c"
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"drivers/md/dm-thin.c"
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],
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"version": "5.4.290",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.234",
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},
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"version": "5.15.177",
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"status": "unaffected",
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"status": "unaffected",
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"versionType": "semver"
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{
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"version": "6.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"title": "dm thin: make get_first_thin use rcu-safe list first function",
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"title": "CVE Program Container",
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"references": [
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"id": "CVE-2025-21664",
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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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},
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"Automatable": "no"
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"Technical Impact": "total"
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:42:38.706450Z"
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