CVE-2026-23253 (GCVE-0-2026-23253)
Vulnerability from cvelistv5
Published
2026-03-18 17:01
Modified
2026-10-19 18:35
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
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    "dateReserved": "2026-01-13T15:37:45.990Z",
    "dateUpdated": "2026-10-19T18:35:40.421Z",
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\", \"lessThan\": \"527cfa8a3486b3555c5c15e2f62be484a11398dc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\", \"lessThan\": \"fb378cf89be434ed1f10ab79cc4788fba8ae868d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\", \"lessThan\": \"f1e520ca2e83ece6731af6167c9e5e16931ecba0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\", \"lessThan\": \"af050ab44fa1b1897a940d7d756e512232f5e5df\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\", \"lessThan\": \"d71781bad59b1c9d60d7068004581f9bf19c0c9d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\", \"lessThan\": \"cfd94642025e6f71c8f754bdec0800ee95e4f3dd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\", \"lessThan\": \"32eb8e4adc207ef31bc6e5ae56bab940b0176066\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\", \"lessThan\": \"bfbc0b5b32a8f28ce284add619bf226716a59bc0\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/media/dvb-core/dmxdev.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.253\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.203\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.167\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.130\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.77\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.17\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/media/dvb-core/dmxdev.c\"], \"defaultStatus\": \"affected\"}], \"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\"}, {\"url\": \"https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd\"}, {\"url\": \"https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066\"}, {\"url\": \"https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.253\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.203\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.167\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.130\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.77\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.17\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.7\", \"versionStartIncluding\": \"2.6.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"2.6.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:20:57.385Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23253\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:35:40.421Z\", \"dateReserved\": \"2026-01-13T15:37:45.990Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-03-18T17:01:44.126Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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