GHSA-9P82-H2X3-6RRV
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31In the Linux kernel, the following vulnerability has been resolved:
ext4: fix circular lock dependency in ext4_ext_migrate
Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a circular lock dependency between s_writepages_rwsem and sb_internal (freeze protection).
The deadlock scenario:
CPU0 (EXT4_IOC_MIGRATE) CPU1 (orphan cleanup during mount) ---- ---- ext4_ext_migrate() ext4_writepages_down_write() s_writepages_rwsem (write) ext4_evict_inode() sb_start_intwrite() [sb_internal] ... ext4_writepages() s_writepages_rwsem (read) [BLOCKED] iput(tmp_inode) ext4_evict_inode() sb_start_intwrite() [BLOCKED]
The tmp_inode is a temporary inode with nlink=0 created solely for building the extent tree. Its eviction does not require s_writepages_rwsem protection, so deferring iput() until after releasing the rwsem is safe.
{
"affected": [],
"aliases": [
"CVE-2026-93269"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T16:17:23Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix circular lock dependency in ext4_ext_migrate\n\nMove iput(tmp_inode) after ext4_writepages_up_write() to avoid a\ncircular lock dependency between s_writepages_rwsem and sb_internal\n(freeze protection).\n\nThe deadlock scenario:\n\n CPU0 (EXT4_IOC_MIGRATE) CPU1 (orphan cleanup during mount)\n ---- ----\n ext4_ext_migrate()\n ext4_writepages_down_write()\n s_writepages_rwsem (write)\n ext4_evict_inode()\n sb_start_intwrite() [sb_internal]\n ...\n ext4_writepages()\n s_writepages_rwsem (read) [BLOCKED]\n iput(tmp_inode)\n ext4_evict_inode()\n sb_start_intwrite() [BLOCKED]\n\nThe tmp_inode is a temporary inode with nlink=0 created solely for\nbuilding the extent tree. Its eviction does not require\ns_writepages_rwsem protection, so deferring iput() until after\nreleasing the rwsem is safe.",
"id": "GHSA-9p82-h2x3-6rrv",
"modified": "2026-09-24T18:31:25Z",
"published": "2026-09-24T18:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93269"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/32f7ab52875ec7f800ca67e7176e5743a84baddf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/452950461241dfed8b1d32e94b227db38c99c5af"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a897682793eba5de51ee6f3152760374afa629cf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ada23457d4748d6e9c36c6f871fc29a6f558c48c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e4223231b6860141813637a6413c2371ae4d6fa8"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.