CVE-2026-80749 (GCVE-0-2026-80749)
Vulnerability from cvelistv5
Published
2026-09-03 08:26
Modified
2026-09-04 04:58
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/connector/hdmi: Fix out of bounds memory read
A helper function was copying a given audio infoframe into the
connector's copy but using the size of the destination (a generic
target, sized to accept many different data blocks) not the source (a
very specific type of data block). Thus, it was copying 60 bytes of
data from a 28 byte allocation.
Fix that by using the source size instead, together with a build bug
on the source size actually being smaller than the destination.
I hit this running KUnit tests under KASAN (while debugging something
else entirely). In the real world, it seems unlikely to cause an
actual problem. It is a read not a write so it can't corrupt any
memory. However, it could potentially fall off the end of a page and
cause an accvio bug.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/display/drm_hdmi_state_helper.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "d9f7454c185c0c7f0973e11d62ad6c06862c324c",
"status": "affected",
"version": "f378b77227bc4732922c57f92be89438bb1018a1",
"versionType": "git"
},
{
"lessThan": "e5b527804a1ea4f70e139179d3062cf5de8c06ab",
"status": "affected",
"version": "f378b77227bc4732922c57f92be89438bb1018a1",
"versionType": "git"
},
{
"lessThan": "f72bb95732bc5ca87b50c52c8f087ba501950809",
"status": "affected",
"version": "f378b77227bc4732922c57f92be89438bb1018a1",
"versionType": "git"
},
{
"lessThan": "9ecf8ba763d0ffe0673538eb4bf7806f20455d19",
"status": "affected",
"version": "f378b77227bc4732922c57f92be89438bb1018a1",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/display/drm_hdmi_state_helper.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"lessThan": "6.11",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.105",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.46",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.10",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.11",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/connector/hdmi: Fix out of bounds memory read\n\nA helper function was copying a given audio infoframe into the\nconnector\u0027s copy but using the size of the destination (a generic\ntarget, sized to accept many different data blocks) not the source (a\nvery specific type of data block). Thus, it was copying 60 bytes of\ndata from a 28 byte allocation.\n\nFix that by using the source size instead, together with a build bug\non the source size actually being smaller than the destination.\n\nI hit this running KUnit tests under KASAN (while debugging something\nelse entirely). In the real world, it seems unlikely to cause an\nactual problem. It is a read not a write so it can\u0027t corrupt any\nmemory. However, it could potentially fall off the end of a page and\ncause an accvio bug."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached only via the ALSA PCM prepare path (SNDRV_PCM_IOCTL_PREPARE) through hdmi-codec into DRM HDMI audio prepare callbacks; it is not reachable from network protocols or remote packet handling.\nAC:L - Any local caller that can prepare HDMI audio reliably hits the faulty memcpy on every invocation; no special memory layout, timing window, or rare kernel configuration is required beyond having a supported HDMI audio driver loaded.\nPR:L - Triggering the path requires only access to ALSA PCM devices (/dev/snd/pcm*) to start HDMI audio playback, which typical unprivileged desktop, mobile, and embedded users already have without real root or init-namespace capabilities.\nUI:N - Exploitation is self-contained: the attacker prepares or starts HDMI audio playback themselves and does not depend on a separate victim performing an additional action beyond normal attacker-controlled playback setup.\nS:U - Impact is confined to kernel memory read and possible local kernel fault within the same privilege domain; it does not cross VM, IOMMU, or sandbox boundaries into another security authority.\nC:H - The vulnerable memcpy reads 60 bytes from a 28-byte hdmi_audio_infoframe, causing a 32-byte out-of-bounds kernel stack read whose contents are copied into connector state; OOB reads are rated High unless strictly limited to a few bytes.\nI:N - This is an out-of-bounds read, not an out-of-bounds write or use-after-free; kernel memory is not corrupted and no arbitrary write or control-flow hijack primitive is created, only mis-sized copying into an intended destination buffer.\nA:H - The over-read can cross a page boundary and fault (as noted by the fix author), producing a kernel oops/access violation; any kernel crash from memory access violations is rated High availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T04:58:29.179Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d9f7454c185c0c7f0973e11d62ad6c06862c324c"
},
{
"url": "https://git.kernel.org/stable/c/e5b527804a1ea4f70e139179d3062cf5de8c06ab"
},
{
"url": "https://git.kernel.org/stable/c/f72bb95732bc5ca87b50c52c8f087ba501950809"
},
{
"url": "https://git.kernel.org/stable/c/9ecf8ba763d0ffe0673538eb4bf7806f20455d19"
}
],
"title": "drm/connector/hdmi: Fix out of bounds memory read",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80749",
"datePublished": "2026-09-03T08:26:30.140Z",
"dateReserved": "2026-08-26T14:34:25.790Z",
"dateUpdated": "2026-09-04T04:58:29.179Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
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.
Loading…
Loading…