ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page() ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order. This isn't a big issue, the user can still re-allocate a new reader page and try again. However, what is more problematic is if the value of subbuf_order changes in the middle of ring_buffer_alloc_read_page(). In that case, bpage->order might not match the actual allocated memory. Use bpage->order for the allocation to prevent this race.
CVE-2026-89503
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-2026-89503
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": "bce761d757452ba5eb77e11fecc37a04b67494e7",
"lessThan": "2313ff69bd237aad264a5913907f374f958335a2",
"versionType": "git"
},
{
"status": "affected",
"version": "bce761d757452ba5eb77e11fecc37a04b67494e7",
"lessThan": "2dc510957fe8fd098ab3c3147ebdf34d00cd2734",
"versionType": "git"
},
{
"status": "affected",
"version": "bce761d757452ba5eb77e11fecc37a04b67494e7",
"lessThan": "53106e9262a310ef2c9a9321168c03705940c678",
"versionType": "git"
},
{
"status": "affected",
"version": "bce761d757452ba5eb77e11fecc37a04b67494e7",
"lessThan": "e743527c5bfdceda1095bc0a9e596e2aebb6a9c3",
"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": "6.18.50",
"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-2026-89503
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35030 · Revision 1
- Added to Heist Feed
- Publisher date