338 lines
17 KiB
JSON
338 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-2026-23253",
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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": "2026-01-13T15:37:45.990Z",
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"datePublished": "2026-03-18T17:01:44.126Z",
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"dateUpdated": "2026-10-19T18:35:40.421Z"
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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": "2026-08-05T12:20:57.385Z"
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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\nmedia: dvb-core: fix wrong reinitialization of ringbuffer on reopen\n\ndvb_dvr_open() calls dvb_ringbuffer_init() when a new reader opens the\nDVR device. dvb_ringbuffer_init() calls init_waitqueue_head(), which\nreinitializes the waitqueue list head to empty.\n\nSince dmxdev->dvr_buffer.queue is a shared waitqueue (all opens of the\nsame DVR device share it), this orphans any existing waitqueue entries\nfrom io_uring poll or epoll, leaving them with stale prev/next pointers\nwhile the list head is reset to {self, self}.\n\nThe waitqueue and spinlock in dvr_buffer are already properly\ninitialized once in dvb_dmxdev_init(). The open path only needs to\nreset the buffer data pointer, size, and read/write positions.\n\nReplace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct\nassignment of data/size and a call to dvb_ringbuffer_reset(), which\nproperly resets pread, pwrite, and error with correct memory ordering\nwithout touching the waitqueue or spinlock."
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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 vulnerability is in the DVB DVR device driver, accessible via opening /dev/dvb/adapter*/dvr* character device files. This requires local system access.\nAC:L - The attacker controls both sides of the race — closing a DVR fd from one thread while reopening it from another. The attacker can reliably trigger the waitqueue reinitialization while stale entries exist.\nPR:L - DVB device files are typically accessible to local users (e.g., via \"video\" group membership). On Android phones, set-top boxes, and embedded media devices, the device user has access to DVB hardware. No elevated privileges are required.\nUI:N - No user interaction is needed. The attacker can open, poll, close, and reopen the DVR device entirely on their own.\nS:U - The vulnerability operates within the kernel's security authority. There is no crossing of security boundaries like VM escape or IOMMU bypass.\nC:H - The waitqueue list corruption creates orphaned entries with stale pointers, which is a use-after-free primitive. UAF gives the attacker control over freed memory contents, enabling arbitrary kernel memory reads.\nI:H - The list corruption from the orphaned waitqueue entries provides write primitives through stale prev/next pointer manipulation. This is a classic kernel list corruption that can be leveraged for arbitrary write and code execution via heap spraying.\nA:H - The stale list pointers will cause a kernel crash/oops when the orphaned wait_queue_entry is removed, as it dereferences corrupted prev/next pointers. This was confirmed by syzbot."
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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/media/dvb-core/dmxdev.c"
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],
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"versions": [
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{
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"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
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"lessThan": "527cfa8a3486b3555c5c15e2f62be484a11398dc",
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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": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
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"lessThan": "fb378cf89be434ed1f10ab79cc4788fba8ae868d",
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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": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
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"lessThan": "f1e520ca2e83ece6731af6167c9e5e16931ecba0",
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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": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
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"lessThan": "af050ab44fa1b1897a940d7d756e512232f5e5df",
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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": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
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"lessThan": "d71781bad59b1c9d60d7068004581f9bf19c0c9d",
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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": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
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"lessThan": "cfd94642025e6f71c8f754bdec0800ee95e4f3dd",
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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": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
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"lessThan": "32eb8e4adc207ef31bc6e5ae56bab940b0176066",
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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": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
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"lessThan": "bfbc0b5b32a8f28ce284add619bf226716a59bc0",
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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/media/dvb-core/dmxdev.c"
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],
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"versions": [
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{
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"version": "2.6.17",
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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": "2.6.17",
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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": "5.10.253",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.203",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.167",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.130",
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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": "6.12.77",
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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": "6.18.17",
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"lessThanOrEqual": "6.18.*",
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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": "6.19.7",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.17",
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"versionEndExcluding": "5.10.253"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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"url": "https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc"
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},
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{
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"url": "https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d"
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},
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{
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"url": "https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0"
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},
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{
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"url": "https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df"
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},
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{
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"url": "https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d"
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},
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{
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"url": "https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd"
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},
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{
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"url": "https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066"
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},
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{
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"url": "https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"
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}
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],
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"title": "media: dvb-core: fix wrong reinitialization of ringbuffer on reopen",
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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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"adp": [
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{
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"x_adpType": "supplier",
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"providerMetadata": {
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-10-15T01:13:21.671Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThan": "*",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unknown"
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}
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],
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"references": [
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
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}
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]
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-23253",
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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": "2026-10-16T15:07:02.099167Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-665",
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"description": "CWE-665 Improper Initialization"
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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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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T18:35:40.421Z"
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}
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}
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]
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}
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} |