ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page Discarding a cached reader page after a concurrent ring buffer resize uses the new global subbuf_order for the free_pages() call. This mismatched order may crashes the kernel or leaks memory because the cached page was allocated under the old size. Save the actual free_page order alongside the page address to ensure we always refer to the correct value and do not rely on the potentially stalled cpu_buffer->subbuf_order value. The simplest is to make free_page a buffer_data_read_page which already covers exactly what we need: a page address and a page order.
CVE-2026-89500
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-2026-89500
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": "8e7b58c27b3c567316a51079b375b846f9223bba",
"lessThan": "d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f",
"versionType": "git"
},
{
"status": "affected",
"version": "8e7b58c27b3c567316a51079b375b846f9223bba",
"lessThan": "a1dabe68fb53730bc0be60c5dbfd3f4c560084e7",
"versionType": "git"
},
{
"status": "affected",
"version": "8e7b58c27b3c567316a51079b375b846f9223bba",
"lessThan": "d787d509bdf6c88c85e095247daf7456cb7fb772",
"versionType": "git"
},
{
"status": "affected",
"version": "8e7b58c27b3c567316a51079b375b846f9223bba",
"lessThan": "7a1fb95de5404134f8758c1295ce88986bdf117c",
"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": "6.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/trace/ring_buffer.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89500
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35026 · Revision 1
- Added to Heist Feed
- Publisher date