jbd2: check need_resched() when skipping busy checkpoint buffers
In the Linux kernel, the following vulnerability has been resolved: jbd2: check need_resched() when skipping busy checkpoint buffers journal_shrink_one_cp_list() skips busy checkpoint buffers when called with JBD2_SHRINK_BUSY_SKIP. The continue statement on this path also skips the need_resched() check at the end of the loop body. Consequently, when a checkpoint list contains mostly busy buffers, the shrinker can walk the entire list while holding journal->j_list_lock, even when a reschedule has been requested. Large checkpoint lists under memory pressure can therefore cause long lock hold times and leave other CPUs spinning on j_list_lock, resulting in soft lockups or RCU stalls. Route the busy-buffer path through the need_resched() check so that the shrinker can release j_list_lock and reschedule promptly, restoring parity with the clean-buffer path, which already checks need_resched(). This does not change which checkpoint buffers are eligible for removal.
CVE-2026-89566
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-2026-89566
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": "dc7ece0b827fe3b748db685fb85cd2fc3710c3f9",
"versionType": "git"
},
{
"status": "affected",
"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "f83c23286e54180cdc83a36463a60003534cc290",
"versionType": "git"
},
{
"status": "affected",
"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "f9182a85991a0ad5cd2940df6db75f40ad90028c",
"versionType": "git"
},
{
"status": "affected",
"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4",
"versionType": "git"
},
{
"status": "affected",
"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb",
"lessThan": "f213e12ff5c9590b1034ae8da0e6d09665c772d0",
"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-2026-89566
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46681 · Revision 1
- Added to Heist Feed
- Publisher date