ghsa-2gxm-8qch-c9vg
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
ext4: avoid journaling sb update on error if journal is destroying
Presently we always BUG_ON if trying to start a transaction on a journal marked with JBD2_UNMOUNT, since this should never happen. However, while ltp running stress tests, it was observed that in case of some error handling paths, it is possible for update_super_work to start a transaction after the journal is destroyed eg:
(umount) ext4_kill_sb kill_block_super generic_shutdown_super sync_filesystem / commits all txns / evict_inodes / might start a new txn / ext4_put_super flush_work(&sbi->s_sb_upd_work) / flush the workqueue / jbd2_journal_destroy journal_kill_thread journal->j_flags |= JBD2_UNMOUNT; jbd2_journal_commit_transaction jbd2_journal_get_descriptor_buffer jbd2_journal_bmap ext4_journal_bmap ext4_map_blocks ... ext4_inode_error ext4_handle_error schedule_work(&sbi->s_sb_upd_work)
/* work queue kicks in */
update_super_work
jbd2_journal_start
start_this_handle
BUG_ON(journal->j_flags &
JBD2_UNMOUNT)
Hence, introduce a new mount flag to indicate journal is destroying and only do a journaled (and deferred) update of sb if this flag is not set. Otherwise, just fallback to an un-journaled commit.
Further, in the journal destroy path, we have the following sequence:
- Set mount flag indicating journal is destroying
- force a commit and wait for it
- flush pending sb updates
This sequence is important as it ensures that, after this point, there is no sb update that might be journaled so it is safe to update the sb outside the journal. (To avoid race discussed in 2d01ddc86606)
Also, we don't need a similar check in ext4_grp_locked_error since it is only called from mballoc and AFAICT it would be always valid to schedule work here.
{
"affected": [],
"aliases": [
"CVE-2025-22113"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-04-16T15:16:05Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid journaling sb update on error if journal is destroying\n\nPresently we always BUG_ON if trying to start a transaction on a journal marked\nwith JBD2_UNMOUNT, since this should never happen. However, while ltp running\nstress tests, it was observed that in case of some error handling paths, it is\npossible for update_super_work to start a transaction after the journal is\ndestroyed eg:\n\n(umount)\next4_kill_sb\n kill_block_super\n generic_shutdown_super\n sync_filesystem /* commits all txns */\n evict_inodes\n /* might start a new txn */\n ext4_put_super\n\tflush_work(\u0026sbi-\u003es_sb_upd_work) /* flush the workqueue */\n jbd2_journal_destroy\n journal_kill_thread\n journal-\u003ej_flags |= JBD2_UNMOUNT;\n jbd2_journal_commit_transaction\n jbd2_journal_get_descriptor_buffer\n jbd2_journal_bmap\n ext4_journal_bmap\n ext4_map_blocks\n ...\n ext4_inode_error\n ext4_handle_error\n schedule_work(\u0026sbi-\u003es_sb_upd_work)\n\n /* work queue kicks in */\n update_super_work\n jbd2_journal_start\n start_this_handle\n BUG_ON(journal-\u003ej_flags \u0026\n JBD2_UNMOUNT)\n\nHence, introduce a new mount flag to indicate journal is destroying and only do\na journaled (and deferred) update of sb if this flag is not set. Otherwise, just\nfallback to an un-journaled commit.\n\nFurther, in the journal destroy path, we have the following sequence:\n\n 1. Set mount flag indicating journal is destroying\n 2. force a commit and wait for it\n 3. flush pending sb updates\n\nThis sequence is important as it ensures that, after this point, there is no sb\nupdate that might be journaled so it is safe to update the sb outside the\njournal. (To avoid race discussed in 2d01ddc86606)\n\nAlso, we don\u0027t need a similar check in ext4_grp_locked_error since it is only\ncalled from mballoc and AFAICT it would be always valid to schedule work here.",
"id": "GHSA-2gxm-8qch-c9vg",
"modified": "2025-04-16T15:34:45Z",
"published": "2025-04-16T15:34:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22113"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ce2f26e73783b4a7c46a86e3af5b5c8de0971790"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/db05767b5bc307143d99fe2afd8c43af58d2ebef"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.