CVE-2026-23253 (GCVE-0-2026-23253)
Vulnerability from cvelistv5
Published
2026-03-18 17:01
Modified
2026-04-18 08:57
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
dvb_dvr_open() calls dvb_ringbuffer_init() when a new reader opens the
DVR device. dvb_ringbuffer_init() calls init_waitqueue_head(), which
reinitializes the waitqueue list head to empty.
Since dmxdev->dvr_buffer.queue is a shared waitqueue (all opens of the
same DVR device share it), this orphans any existing waitqueue entries
from io_uring poll or epoll, leaving them with stale prev/next pointers
while the list head is reset to {self, self}.
The waitqueue and spinlock in dvr_buffer are already properly
initialized once in dvb_dmxdev_init(). The open path only needs to
reset the buffer data pointer, size, and read/write positions.
Replace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct
assignment of data/size and a call to dvb_ringbuffer_reset(), which
properly resets pread, pwrite, and error with correct memory ordering
without touching the waitqueue or spinlock.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 34731df288a5ffe4b0c396caf8cd24c6a710a222 Version: 34731df288a5ffe4b0c396caf8cd24c6a710a222 Version: 34731df288a5ffe4b0c396caf8cd24c6a710a222 Version: 34731df288a5ffe4b0c396caf8cd24c6a710a222 Version: 34731df288a5ffe4b0c396caf8cd24c6a710a222 Version: 34731df288a5ffe4b0c396caf8cd24c6a710a222 Version: 34731df288a5ffe4b0c396caf8cd24c6a710a222 Version: 34731df288a5ffe4b0c396caf8cd24c6a710a222 |
||
{
"containers": {
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"programFiles": [
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],
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"vendor": "Linux",
"versions": [
{
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"version": "2.6.17"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.77",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.17",
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},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.7",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"negate": false,
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],
"descriptions": [
{
"lang": "en",
"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-\u003edvr_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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-18T08:57:26.705Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc"
},
{
"url": "https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d"
},
{
"url": "https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0"
},
{
"url": "https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df"
},
{
"url": "https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d"
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{
"url": "https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd"
},
{
"url": "https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066"
},
{
"url": "https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"
}
],
"title": "media: dvb-core: fix wrong reinitialization of ringbuffer on reopen",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-23253",
"datePublished": "2026-03-18T17:01:44.126Z",
"dateReserved": "2026-01-13T15:37:45.990Z",
"dateUpdated": "2026-04-18T08:57:26.705Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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