180 lines
11 KiB
JSON
180 lines
11 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-2025-40028",
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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": "2025-04-16T07:20:57.152Z",
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"datePublished": "2025-10-28T09:32:35.681Z",
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"dateUpdated": "2026-08-05T12:07:10.905Z"
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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": "2026-08-05T12:07:10.905Z"
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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\nbinder: fix double-free in dbitmap\n\nA process might fail to allocate a new bitmap when trying to expand its\nproc->dmap. In that case, dbitmap_grow() fails and frees the old bitmap\nvia dbitmap_free(). However, the driver calls dbitmap_free() again when\nthe same process terminates, leading to a double-free error:\n\n ==================================================================\n BUG: KASAN: double-free in binder_proc_dec_tmpref+0x2e0/0x55c\n Free of addr ffff00000b7c1420 by task kworker/9:1/209\n\n CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n Workqueue: events binder_deferred_func\n Call trace:\n kfree+0x164/0x31c\n binder_proc_dec_tmpref+0x2e0/0x55c\n binder_deferred_func+0xc24/0x1120\n process_one_work+0x520/0xba4\n [...]\n\n Allocated by task 448:\n __kmalloc_noprof+0x178/0x3c0\n bitmap_zalloc+0x24/0x30\n binder_open+0x14c/0xc10\n [...]\n\n Freed by task 449:\n kfree+0x184/0x31c\n binder_inc_ref_for_node+0xb44/0xe44\n binder_transaction+0x29b4/0x7fbc\n binder_thread_write+0x1708/0x442c\n binder_ioctl+0x1b50/0x2900\n [...]\n ==================================================================\n\nFix this issue by marking proc->map NULL in dbitmap_free()."
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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 bug is reached only through `ioctl()`/`write()` on a binder character device (`/dev/binder` or a binderfs device node), requiring a local process on the system. There is no remote or network-facing path into `binder_transaction()`.\nAC:L - The attacker fully controls both preconditions: the size of the failing `bitmap_zalloc()` (by creating hundreds of thousands of binder references so the doubling bitmap enters costly-order allocations that fail without invoking the OOM killer) and the memory pressure/fragmentation that makes it fail, then chooses exactly when the second free occurs by closing the fd. The window between the two frees is arbitrarily long, making heap grooming reliable.\nPR:L - Binder contains no `capable()` checks at all on this path; on Android every unprivileged app can open a binder device, and on distro kernels with CONFIG_ANDROID_BINDERFS an unprivileged user can mount binderfs inside a user namespace (`FS_USERNS_MOUNT`) and create devices without any capability. Only a basic local account is needed.\nUI:N - The attacking process performs everything itself — open the device, drive transactions to grow the bitmap, exhaust memory, then close the fd. No victim action is involved.\nS:U - The corruption is confined to the kernel's own heap/page allocator within the same security authority; there is no VM, IOMMU, or hypervisor boundary crossed.\nC:H - The double free lets the attacker reclaim the chunk with a chosen object and then have the kernel free it while still in use, producing a use-after-free with overlapping allocations that can be leveraged to read arbitrary kernel memory (credentials, keys, KASLR data).\nI:H - Freeing an in-use, attacker-sprayed object (or a costly-order page, giving cross-cache/physical-page reuse) yields a write primitive over kernel objects, enabling control-flow hijack and privilege escalation to root.\nA:H - Even unweaponized, the double free corrupts the SLUB freelist or page allocator and reliably panics the kernel (KASAN reports it as a `double-free` BUG), and the attacker can repeat it across many binder fds."
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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/android/dbitmap.h"
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],
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"versions": [
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{
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"version": "15d9da3f818cae676f822a04407d3c17b53357d2",
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"lessThan": "c301ec61ce6f16e21a36b99225ca8a20c1591e10",
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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": "15d9da3f818cae676f822a04407d3c17b53357d2",
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"lessThan": "0390633979969c54c0ce6a198d6f45cdbe2c84b1",
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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": "15d9da3f818cae676f822a04407d3c17b53357d2",
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"lessThan": "b781e5635a3398e2b64440371233c2c5102cd6cb",
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"lessThan": "3ebcd3460cad351f198c39c6edb4af519a0ed934",
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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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"drivers/android/dbitmap.h"
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],
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"versions": [
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{
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"version": "6.11",
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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": "6.11",
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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": "6.12.52",
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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": "6.16.12",
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"lessThanOrEqual": "6.16.*",
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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": "6.17.2",
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"lessThanOrEqual": "6.17.*",
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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": "6.18",
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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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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.12.52"
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},
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"versionEndExcluding": "6.18"
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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/c301ec61ce6f16e21a36b99225ca8a20c1591e10"
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},
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{
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"url": "https://git.kernel.org/stable/c/0390633979969c54c0ce6a198d6f45cdbe2c84b1"
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},
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{
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"url": "https://git.kernel.org/stable/c/b781e5635a3398e2b64440371233c2c5102cd6cb"
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},
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{
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"url": "https://git.kernel.org/stable/c/3ebcd3460cad351f198c39c6edb4af519a0ed934"
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}
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],
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"title": "binder: fix double-free in dbitmap",
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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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} |