ring-buffer: Fix possible dereference of uninitialized pointer
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix possible dereference of uninitialized pointer There is a pointer head_page in rb_meta_validate_events() which is not initialized at the beginning of a function. This pointer can be dereferenced if there is a failure during reader page validation. In this case the control is passed to "invalid" label where the pointer is dereferenced in a loop. To fix the issue initialize orig_head and head_page before calling rb_validate_buffer. Found by Linux Verification Center (linuxtesting.org) with SVACE.
CVE-2026-43272
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43272
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55",
"lessThan": "a4afdff9c715af50cf6c3f2dc601932c2cea17a2",
"versionType": "git"
},
{
"status": "affected",
"version": "5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55",
"lessThan": "bc77986f3cb7476637052edf2d87137fa39f153d",
"versionType": "git"
},
{
"status": "affected",
"version": "5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55",
"lessThan": "d9942396845fef2369478c157b26738fe07142f6",
"versionType": "git"
},
{
"status": "affected",
"version": "5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55",
"lessThan": "f1547779402c4cd67755c33616b7203baa88420b",
"versionType": "git"
}
],
"programFiles": [
"kernel/trace/ring_buffer.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/trace/ring_buffer.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43272
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46281 · Revision 1
- Added to Heist Feed
- Publisher date