214 lines
12 KiB
JSON
214 lines
12 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-2025-21810",
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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": "2024-12-29T08:45:45.772Z",
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"datePublished": "2025-02-27T20:01:01.630Z",
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"dateUpdated": "2026-10-15T21:51:53.284Z"
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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": "2026-08-05T11:54:37.861Z"
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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\ndriver core: class: Fix wild pointer dereferences in API class_dev_iter_next()\n\nThere are a potential wild pointer dereferences issue regarding APIs\nclass_dev_iter_(init|next|exit)(), as explained by below typical usage:\n\n// All members of @iter are wild pointers.\nstruct class_dev_iter iter;\n\n// class_dev_iter_init(@iter, @class, ...) checks parameter @class for\n// potential class_to_subsys() error, and it returns void type and does\n// not initialize its output parameter @iter, so caller can not detect\n// the error and continues to invoke class_dev_iter_next(@iter) even if\n// @iter still contains wild pointers.\nclass_dev_iter_init(&iter, ...);\n\n// Dereference these wild pointers in @iter here once suffer the error.\nwhile (dev = class_dev_iter_next(&iter)) { ... };\n\n// Also dereference these wild pointers here.\nclass_dev_iter_exit(&iter);\n\nActually, all callers of these APIs have such usage pattern in kernel tree.\nFix by:\n- Initialize output parameter @iter by memset() in class_dev_iter_init()\n and give callers prompt by pr_crit() for the error.\n- Check if @iter is valid in class_dev_iter_next()."
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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 - Every affected consumer of class_dev_iter_*() is reached through local interfaces — `/proc/diskstats` and `/proc/partitions` (disk_seqf_start), cgroup `io.stat` (blkcg_fill_root_iostats), and the NFC generic-netlink `NFC_CMD_GET_DEVICE` dump. There is no remote or adjacent-network consumer of this driver-core API.\nAC:L - Once the code path is entered the wild dereference is deterministic, and the attacker controls the memory that becomes the iterator: on the two most reachable paths the iterator is a plain unzeroed `kmalloc(32)` object, so an unprivileged process can pre-spray `kmalloc-32` with chosen bytes and repeat the triggering read/dump arbitrarily often until the layout lands.\nPR:L - `/proc/diskstats`, `/proc/partitions` and cgroup `io.stat` are world-readable, and the NFC `NFC_CMD_GET_DEVICE` dumpit entry in `nfc_genl_ops[]` is one of the few NFC operations with no `GENL_ADMIN_PERM` flag — so an ordinary unprivileged local user reaches `class_dev_iter_next()` with no capability of any kind.\nUI:N - The attacker triggers the path entirely on their own by reading a procfs file or issuing a netlink dump; no victim action, mount, or device plug-in is involved.\nS:U - The corruption and any resulting code execution stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `klist_next()` dereferences the uninitialized `i_klist` and walks `k_list`/`n_node` links, giving an attacker-directed read of arbitrary kernel memory that is then reflected through the iteration; combined with the call gadget this yields full memory disclosure.\nI:H - The uninitialized iterator drives `spin_lock_irqsave()` on a controlled address, a `kref_put`/`list_del` write pair in `klist_dec_and_del()`, and finally an indirect call `put(last)` through a function pointer read from attacker-groomable memory — an arbitrary-write and control-flow-hijack primitive.\nA:H - Even without successful grooming, dereferencing wild pointers in `klist_next()`/`klist_iter_exit()`/`subsys_put()` reliably produces a kernel oops or panic, and it happens while holding a spinlock with interrupts disabled."
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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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"drivers/base/class.c"
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],
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"versions": [
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{
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"version": "7b884b7f24b42fa25e92ed724ad82f137610afaf",
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"lessThan": "f4b9bc823b0cfdebfed479c0e87d6939c7562e87",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "7b884b7f24b42fa25e92ed724ad82f137610afaf",
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"lessThan": "1614e75d1a1b63db6421c7a4bf37004720c7376c",
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"status": "affected",
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"lessThan": "5c504e9767b947cf7d4e29b811c0c8b3c53242b7",
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"lessThan": "e128f82f7006991c99a58114f70ef61e937b1ac1",
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"status": "affected",
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}
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]
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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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"drivers/base/class.c"
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],
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"versions": [
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{
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"version": "6.4",
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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": "6.4",
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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": "6.6.76",
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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": "6.12.13",
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"lessThanOrEqual": "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": "6.13.2",
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"lessThanOrEqual": "6.13.*",
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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": "6.14",
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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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"operator": "OR",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.4",
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"versionEndExcluding": "6.6.76"
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},
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f4b9bc823b0cfdebfed479c0e87d6939c7562e87"
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},
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{
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"url": "https://git.kernel.org/stable/c/1614e75d1a1b63db6421c7a4bf37004720c7376c"
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},
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{
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"url": "https://git.kernel.org/stable/c/5c504e9767b947cf7d4e29b811c0c8b3c53242b7"
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},
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{
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"url": "https://git.kernel.org/stable/c/e128f82f7006991c99a58114f70ef61e937b1ac1"
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}
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],
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"title": "driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()",
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"adp": [
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-21810",
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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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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:43:01.612001Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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