226 lines
12 KiB
JSON
226 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-2026-53193",
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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": "2026-06-09T07:44:35.390Z",
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"datePublished": "2026-06-25T08:39:04.346Z",
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"dateUpdated": "2026-10-19T19:57:27.947Z"
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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": "2026-08-05T12:33:59.686Z"
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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\nALSA: timer: Forcibly close timer instances at closing\n\nWhen snd_timer object is freed via snd_timer_free() and still pending\nsnd_timer_instance objects are assigned to the timer object, it tries\nto unlink all instances and just set NULL to each ti->timer, then\nreleases the resources immediately. The problem is, however, when\nthere are slave timer instances that are associated with a master\ninstance linked to this timer: namely, those slave instances still\npoint to the freed timer object although the master instance is\nunlinked, which may lead to user-after-free. The bug can be easily\ntriggered particularly when a new userspace-driven timers\n(CONFIG_SND_UTIMER) is involved, since it can create and delete the\ntimer object via a simple file open/close, while the other\napplications may keep accessing to that timer.\n\nThis patch is an attempt to paper over the problem above: now instead\nof just unlinking, call snd_timer_close[_locked]() forcibly for each\npending timer instance, so that all assigned slave timer instances are\nproperly detached, too. Since snd_timer_close() might be called later\nby the driver that created that instance, the check of\nSNDRV_TIMER_IFLG_DEAD is added at the beginning, too."
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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 path is reached through local `/dev/snd/timer` opens and ALSA timer ioctls, including `SNDRV_TIMER_IOCTL_CREATE`, `SELECT`, and later access to retained timer instances.\nAC:L - The attacker can create the userspace-driven timer, bind matching master/slave timer instances, close the timer fd to free the object, and then access the stale slave instance without relying on uncontrollable conditions.\nPR:L - The code path has no capability checks, but it requires a local user able to open `/dev/snd/timer` and issue ioctls.\nUI:N - No victim action is required after the attacker has local access; the attacker controls all needed file descriptors and ioctls.\nS:U - The impact is within the kernel/local system security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - This is a kernel use-after-free of `struct snd_timer`; stale timer pointers can be dereferenced by later ioctls and may expose reclaimed kernel heap contents or enable broader memory disclosure.\nI:H - The stale timer pointer is used in paths that take locks and manipulate lists/callback-related state, making kernel heap corruption and control-flow-impacting exploitation defensible.\nA:H - At minimum, dereferencing and locking a freed kernel timer object can trigger a kernel oops, panic, or hang."
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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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"sound/core/timer.c"
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],
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"versions": [
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{
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"version": "37745918e0e7575bc40f38da93a99b9fa6406224",
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"lessThan": "586b219a22b1032b28b8bd356b963276c5e5bf53",
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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": "37745918e0e7575bc40f38da93a99b9fa6406224",
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"lessThan": "f46093dd22969037beb1fce2e043f3236be41c92",
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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": "37745918e0e7575bc40f38da93a99b9fa6406224",
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"lessThan": "60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f",
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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": "37745918e0e7575bc40f38da93a99b9fa6406224",
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"lessThan": "da3039e91d1f835874ed6e9a33ea19ee80c2cb92",
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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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"sound/core/timer.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": "6.12.94",
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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": "6.18.36",
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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": "7.0.13",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "6.12.94"
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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": "6.18.36"
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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": "7.0.13"
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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": "7.1"
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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/586b219a22b1032b28b8bd356b963276c5e5bf53"
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},
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{
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"url": "https://git.kernel.org/stable/c/f46093dd22969037beb1fce2e043f3236be41c92"
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},
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{
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"url": "https://git.kernel.org/stable/c/60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f"
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},
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{
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"url": "https://git.kernel.org/stable/c/da3039e91d1f835874ed6e9a33ea19ee80c2cb92"
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}
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],
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"title": "ALSA: timer: Forcibly close timer instances at closing",
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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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"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-2026-53193",
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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": "2026-10-16T15:26:37.858700Z"
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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-416",
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"description": "CWE-416 Use After Free"
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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": "2026-10-19T19:57:27.947Z"
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}
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}
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]
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}
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} |