159 lines
8.8 KiB
JSON
159 lines
8.8 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-2025-38012",
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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": "2025-04-16T04:51:23.977Z",
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"datePublished": "2025-06-18T09:28:22.057Z",
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"dateUpdated": "2026-08-05T11:58:57.764Z"
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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": "2026-08-05T11:58:57.764Z"
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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\nsched_ext: bpf_iter_scx_dsq_new() should always initialize iterator\n\nBPF programs may call next() and destroy() on BPF iterators even after new()\nreturns an error value (e.g. bpf_for_each() macro ignores error returns from\nnew()). bpf_iter_scx_dsq_new() could leave the iterator in an uninitialized\nstate after an error return causing bpf_iter_scx_dsq_next() to dereference\ngarbage data. Make bpf_iter_scx_dsq_new() always clear $kit->dsq so that\nnext() and destroy() become noops."
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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 - Exploitation requires loading and running a BPF program via the local `bpf()` syscall (BPF_PROG_LOAD + BPF_PROG_TEST_RUN, or a struct_ops/tracing attach). There is no remote or adjacent-network path to the sched_ext DSQ iterator kfuncs.\nAC:L - The trigger is fully deterministic — pass an invalid flag bit to `bpf_iter_scx_dsq_new()` and call `next()` — with no race, no timing window, and no dependence on ambient memory layout, since the attacker pre-seeds the iterator stack slots with values of their choosing. `CONFIG_SCHED_CLASS_EXT` is enabled in mainstream 6.12+ distro kernels.\nPR:L - Only CAP_BPF is needed: the iterator kfuncs are registered for `BPF_PROG_TYPE_SYSCALL`, which is not perfmon/net-admin gated, and `bpf_prog_test_run_syscall()` adds no capability check. `bpf_token_capable()` allows CAP_BPF to be delegated into an unprivileged user namespace via a bpffs BPF token, so an ordinary low-privileged container user can reach it.\nUI:N - The attacker's own BPF program triggers the flaw synchronously; no victim action, mount, or file open is involved.\nS:U - The corruption and its consequences are confined to the kernel's own security authority — a standard local privilege escalation with no VM, IOMMU, or hypervisor boundary crossed.\nC:H - `nldsq_next_task()` dereferences the attacker-supplied `kit->dsq` pointer and then walks arbitrary `list_head` next/prev chains, yielding an arbitrary kernel-memory read primitive that can disclose credentials, keys, and KASLR state.\nI:H - The uninitialized `kit->cursor` drives `list_move()`/`list_del_init()` against attacker-chosen addresses, and `raw_spin_lock_irqsave(&kit->dsq->lock)` performs a read-modify-write at an arbitrary address — a controlled kernel write primitive leading to full privilege escalation.\nA:H - Dereferencing garbage pointers under `raw_spin_lock_irqsave()` reliably produces a kernel oops or a hard lockup on a bogus spinlock, and any unprivileged-BPF-capable process can repeat it at will to panic the machine."
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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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"kernel/sched/ext.c"
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],
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"versions": [
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{
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"version": "650ba21b131ed1f8ee57826b2c6295a3be221132",
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"lessThan": "0102989af4c334d1d98b2a0fd4d61a5152e39b72",
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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": "650ba21b131ed1f8ee57826b2c6295a3be221132",
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"lessThan": "255dd31bfc4a67a19b1fc2cd130a50284dadfe3a",
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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": "650ba21b131ed1f8ee57826b2c6295a3be221132",
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"lessThan": "428dc9fc0873989d73918d4a9cc22745b7bbc799",
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"status": "affected",
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"versionType": "git"
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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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"kernel/sched/ext.c"
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],
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"versions": [
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{
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"version": "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": "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": "6.12.30",
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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": "6.14.8",
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"lessThanOrEqual": "6.14.*",
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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": "6.15",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12",
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"versionEndExcluding": "6.12.30"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12",
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"versionEndExcluding": "6.14.8"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12",
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"versionEndExcluding": "6.15"
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}
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]
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}
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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/0102989af4c334d1d98b2a0fd4d61a5152e39b72"
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},
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{
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"url": "https://git.kernel.org/stable/c/255dd31bfc4a67a19b1fc2cd130a50284dadfe3a"
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},
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{
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"url": "https://git.kernel.org/stable/c/428dc9fc0873989d73918d4a9cc22745b7bbc799"
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}
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],
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"title": "sched_ext: bpf_iter_scx_dsq_new() should always initialize iterator",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |