jbd2: bound shrinker scans by examined checkpoint buffers
In the Linux kernel, the following vulnerability has been resolved: jbd2: bound shrinker scans by examined checkpoint buffers The jbd2 shrinker currently accounts only checkpoint buffers that it successfully releases against nr_to_scan. Busy buffers therefore do not consume the scan budget. If a checkpoint transaction contains mostly busy buffers, the shrinker can scan its entire checkpoint list while holding journal->j_list_lock. Large checkpoint lists can result in excessive lock hold times and leave other CPUs spinning on j_list_lock, causing soft lockups or RCU stalls. Pass nr_to_scan into journal_shrink_one_cp_list() and decrement it for every buffer examined, including busy buffers. Pass NULL from checkpoint cleanup paths so their existing full-list behavior is preserved. This restores the scan-budget semantics that existed before journal_shrink_one_cp_list() was changed to always scan a complete checkpoint list.
CVE-2026-89567
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-2026-89567
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": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "6b5366ba63a58819396045ab146bd37ff9e503c6",
"versionType": "git"
},
{
"status": "affected",
"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "edf5fcd0469b7467bd5b37a79502c8d9c3257dbb",
"versionType": "git"
},
{
"status": "affected",
"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "71c6b872c746465fa4b5def239cb296173ca8216",
"versionType": "git"
},
{
"status": "affected",
"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "c2c0fb364685b8996c357d3b050394959b29d6e0",
"versionType": "git"
},
{
"status": "affected",
"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "15cb16496446b94e67f7abcb049b8e2c75cd3d02",
"versionType": "git"
},
{
"status": "affected",
"version": "9c31bb2684f8035beca0275349d19d679b679ffb",
"versionType": "git"
},
{
"status": "affected",
"version": "5fda50e262e65bd553ff777c4b280afd1495a18b",
"versionType": "git"
},
{
"status": "affected",
"version": "557fda9ed70ebf8eda2620ba3d746215285a1303",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.129",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.50",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.4.13",
"lessThan": "6.5",
"versionType": "semver"
}
],
"programFiles": [
"fs/jbd2/checkpoint.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"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": [
"fs/jbd2/checkpoint.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89567
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46682 · Revision 1
- Added to Heist Feed
- Publisher date