GSD-2023-52501
Vulnerability from gsd - Updated: 2024-02-21 06:01Details
In the Linux kernel, the following vulnerability has been resolved:
ring-buffer: Do not attempt to read past "commit"
When iterating over the ring buffer while the ring buffer is active, the
writer can corrupt the reader. There's barriers to help detect this and
handle it, but that code missed the case where the last event was at the
very end of the page and has only 4 bytes left.
The checks to detect the corruption by the writer to reads needs to see the
length of the event. If the length in the first 4 bytes is zero then the
length is stored in the second 4 bytes. But if the writer is in the process
of updating that code, there's a small window where the length in the first
4 bytes could be zero even though the length is only 4 bytes. That will
cause rb_event_length() to read the next 4 bytes which could happen to be off the
allocated page.
To protect against this, fail immediately if the next event pointer is
less than 8 bytes from the end of the commit (last byte of data), as all
events must be a minimum of 8 bytes anyway.
Aliases
{
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2023-52501"
],
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not attempt to read past \"commit\"\n\nWhen iterating over the ring buffer while the ring buffer is active, the\nwriter can corrupt the reader. There\u0027s barriers to help detect this and\nhandle it, but that code missed the case where the last event was at the\nvery end of the page and has only 4 bytes left.\n\nThe checks to detect the corruption by the writer to reads needs to see the\nlength of the event. If the length in the first 4 bytes is zero then the\nlength is stored in the second 4 bytes. But if the writer is in the process\nof updating that code, there\u0027s a small window where the length in the first\n4 bytes could be zero even though the length is only 4 bytes. That will\ncause rb_event_length() to read the next 4 bytes which could happen to be off the\nallocated page.\n\nTo protect against this, fail immediately if the next event pointer is\nless than 8 bytes from the end of the commit (last byte of data), as all\nevents must be a minimum of 8 bytes anyway.",
"id": "GSD-2023-52501",
"modified": "2024-02-21T06:01:53.497115Z",
"schema_version": "1.4.0"
}
},
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"ID": "CVE-2023-52501",
"STATE": "PUBLIC"
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"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Linux",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_name": "1da177e4c3f4",
"version_value": "cee5151c5410"
},
{
"version_value": "not down converted",
"x_cve_json_5_version_data": {
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"status": "unaffected",
"version": "5.10.198",
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{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.134",
"versionType": "custom"
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{
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"status": "unaffected",
"version": "6.1.56",
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"status": "unaffected",
"version": "6.5.6",
"versionType": "custom"
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{
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"version": "6.6",
"versionType": "original_commit_for_fix"
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"lang": "eng",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not attempt to read past \"commit\"\n\nWhen iterating over the ring buffer while the ring buffer is active, the\nwriter can corrupt the reader. There\u0027s barriers to help detect this and\nhandle it, but that code missed the case where the last event was at the\nvery end of the page and has only 4 bytes left.\n\nThe checks to detect the corruption by the writer to reads needs to see the\nlength of the event. If the length in the first 4 bytes is zero then the\nlength is stored in the second 4 bytes. But if the writer is in the process\nof updating that code, there\u0027s a small window where the length in the first\n4 bytes could be zero even though the length is only 4 bytes. That will\ncause rb_event_length() to read the next 4 bytes which could happen to be off the\nallocated page.\n\nTo protect against this, fail immediately if the next event pointer is\nless than 8 bytes from the end of the commit (last byte of data), as all\nevents must be a minimum of 8 bytes anyway."
}
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"name": "https://git.kernel.org/stable/c/cee5151c5410e868826b8afecfb356f3799ebea3",
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"url": "https://git.kernel.org/stable/c/cee5151c5410e868826b8afecfb356f3799ebea3"
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{
"name": "https://git.kernel.org/stable/c/344f2f3e61a90f0150c754796ec9a17fcaeec03d",
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"url": "https://git.kernel.org/stable/c/344f2f3e61a90f0150c754796ec9a17fcaeec03d"
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"name": "https://git.kernel.org/stable/c/b08a4938229dbb530a35c41b83002a1457c6ff49",
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"url": "https://git.kernel.org/stable/c/b08a4938229dbb530a35c41b83002a1457c6ff49"
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{
"name": "https://git.kernel.org/stable/c/75fc9e99b3a71006720ad1e029db11a4b5c32d4a",
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"url": "https://git.kernel.org/stable/c/75fc9e99b3a71006720ad1e029db11a4b5c32d4a"
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{
"name": "https://git.kernel.org/stable/c/95a404bd60af6c4d9d8db01ad14fe8957ece31ca",
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"url": "https://git.kernel.org/stable/c/95a404bd60af6c4d9d8db01ad14fe8957ece31ca"
}
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}
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"cve": {
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not attempt to read past \"commit\"\n\nWhen iterating over the ring buffer while the ring buffer is active, the\nwriter can corrupt the reader. There\u0027s barriers to help detect this and\nhandle it, but that code missed the case where the last event was at the\nvery end of the page and has only 4 bytes left.\n\nThe checks to detect the corruption by the writer to reads needs to see the\nlength of the event. If the length in the first 4 bytes is zero then the\nlength is stored in the second 4 bytes. But if the writer is in the process\nof updating that code, there\u0027s a small window where the length in the first\n4 bytes could be zero even though the length is only 4 bytes. That will\ncause rb_event_length() to read the next 4 bytes which could happen to be off the\nallocated page.\n\nTo protect against this, fail immediately if the next event pointer is\nless than 8 bytes from the end of the commit (last byte of data), as all\nevents must be a minimum of 8 bytes anyway."
}
],
"id": "CVE-2023-52501",
"lastModified": "2024-03-04T13:58:23.447",
"metrics": {},
"published": "2024-03-02T22:15:47.153",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/344f2f3e61a90f0150c754796ec9a17fcaeec03d"
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{
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cee5151c5410e868826b8afecfb356f3799ebea3"
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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