CVE-2022-50673 (GCVE-0-2022-50673)
Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2026-08-05 08:59
VLAI
EPSS
VEX
Title
ext4: fix use-after-free in ext4_orphan_cleanup
Summary
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix use-after-free in ext4_orphan_cleanup
I caught a issue as follows:
==================================================================
BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0
Read of size 8 at addr ffff88814b13f378 by task mount/710
CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370
Call Trace:
<TASK>
dump_stack_lvl+0x73/0x9f
print_report+0x25d/0x759
kasan_report+0xc0/0x120
__asan_load8+0x99/0x140
__list_add_valid+0x28/0x1a0
ext4_orphan_cleanup+0x564/0x9d0 [ext4]
__ext4_fill_super+0x48e2/0x5300 [ext4]
ext4_fill_super+0x19f/0x3a0 [ext4]
get_tree_bdev+0x27b/0x450
ext4_get_tree+0x19/0x30 [ext4]
vfs_get_tree+0x49/0x150
path_mount+0xaae/0x1350
do_mount+0xe2/0x110
__x64_sys_mount+0xf0/0x190
do_syscall_64+0x35/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
</TASK>
[...]
==================================================================
Above issue may happen as follows:
-------------------------------------
ext4_fill_super
ext4_orphan_cleanup
--- loop1: assume last_orphan is 12 ---
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan)
ext4_truncate --> return 0
ext4_inode_attach_jinode --> return -ENOMEM
iput(inode) --> free inode<12>
--- loop2: last_orphan is still 12 ---
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
// use inode<12> and trigger UAF
To solve this issue, we need to propagate the return value of
ext4_inode_attach_jinode() appropriately.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 15:48 UTC
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 , < 7f801a1593cb957f73659732836b2dafbdfc7709
(git)
Affected: 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 , < 026a4490b5381229a30f23d073b58e8e35ee6858 (git) Affected: 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 , < 7223d5e75f26352354ea2c0ccf8b579821b52adf (git) Affected: 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 , < cf0e0817b0f925b70d101d7014ea81b7094e1159 (git) Affected: 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 , < c2bdbd4c69308835d1b6f6ba74feeccbfe113478 (git) Affected: 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 , < 7908b8a541b1578cc61b4da7f19b604a931441da (git) Affected: 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 , < a71248b1accb2b42e4980afef4fa4a27fa0e36f5 (git) |
guessed | |
| Linux | Linux |
Affected:
4.10
Unaffected: 0 , < 4.10 (semver) Unaffected: 4.19.270 , ≤ 4.19.* (semver) Unaffected: 5.4.229 , ≤ 5.4.* (semver) Unaffected: 5.10.163 , ≤ 5.10.* (semver) Unaffected: 5.15.87 , ≤ 5.15.* (semver) Unaffected: 6.0.18 , ≤ 6.0.* (semver) Unaffected: 6.1.4 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_orphan_cleanup\n\nI caught a issue as follows:\n==================================================================\n BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0\n Read of size 8 at addr ffff88814b13f378 by task mount/710\n\n CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x73/0x9f\n print_report+0x25d/0x759\n kasan_report+0xc0/0x120\n __asan_load8+0x99/0x140\n __list_add_valid+0x28/0x1a0\n ext4_orphan_cleanup+0x564/0x9d0 [ext4]\n __ext4_fill_super+0x48e2/0x5300 [ext4]\n ext4_fill_super+0x19f/0x3a0 [ext4]\n get_tree_bdev+0x27b/0x450\n ext4_get_tree+0x19/0x30 [ext4]\n vfs_get_tree+0x49/0x150\n path_mount+0xaae/0x1350\n do_mount+0xe2/0x110\n __x64_sys_mount+0xf0/0x190\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n \u003c/TASK\u003e\n [...]\n==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\next4_fill_super\n ext4_orphan_cleanup\n --- loop1: assume last_orphan is 12 ---\n list_add(\u0026EXT4_I(inode)-\u003ei_orphan, \u0026EXT4_SB(sb)-\u003es_orphan)\n ext4_truncate --\u003e return 0\n ext4_inode_attach_jinode --\u003e return -ENOMEM\n iput(inode) --\u003e free inode\u003c12\u003e\n --- loop2: last_orphan is still 12 ---\n list_add(\u0026EXT4_I(inode)-\u003ei_orphan, \u0026EXT4_SB(sb)-\u003es_orphan);\n // use inode\u003c12\u003e and trigger UAF\n\nTo solve this issue, we need to propagate the return value of\next4_inode_attach_jinode() appropriately."
}
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_orphan_cleanup\n\nI caught a issue as follows:\n==================================================================\n BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0\n Read of size 8 at addr ffff88814b13f378 by task mount/710\n\n CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x73/0x9f\n print_report+0x25d/0x759\n kasan_report+0xc0/0x120\n __asan_load8+0x99/0x140\n __list_add_valid+0x28/0x1a0\n ext4_orphan_cleanup+0x564/0x9d0 [ext4]\n __ext4_fill_super+0x48e2/0x5300 [ext4]\n ext4_fill_super+0x19f/0x3a0 [ext4]\n get_tree_bdev+0x27b/0x450\n ext4_get_tree+0x19/0x30 [ext4]\n vfs_get_tree+0x49/0x150\n path_mount+0xaae/0x1350\n do_mount+0xe2/0x110\n __x64_sys_mount+0xf0/0x190\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n \u003c/TASK\u003e\n [...]\n==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\next4_fill_super\n ext4_orphan_cleanup\n --- loop1: assume last_orphan is 12 ---\n list_add(\u0026EXT4_I(inode)-\u003ei_orphan, \u0026EXT4_SB(sb)-\u003es_orphan)\n ext4_truncate --\u003e return 0\n ext4_inode_attach_jinode --\u003e return -ENOMEM\n iput(inode) --\u003e free inode\u003c12\u003e\n --- loop2: last_orphan is still 12 ---\n list_add(\u0026EXT4_I(inode)-\u003ei_orphan, \u0026EXT4_SB(sb)-\u003es_orphan);\n // use inode\u003c12\u003e and trigger UAF\n\nTo solve this issue, we need to propagate the return value of\next4_inode_attach_jinode() appropriately."
}
],
"id": "CVE-2022-50673",
"lastModified": "2026-08-04T10:18:21.107",
"metrics": {
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"attackVector": "LOCAL",
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"baseScore": 7.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"published": "2025-12-09T16:17:19.473",
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"url": "https://git.kernel.org/stable/c/7223d5e75f26352354ea2c0ccf8b579821b52adf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7908b8a541b1578cc61b4da7f19b604a931441da"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7f801a1593cb957f73659732836b2dafbdfc7709"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a71248b1accb2b42e4980afef4fa4a27fa0e36f5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c2bdbd4c69308835d1b6f6ba74feeccbfe113478"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cf0e0817b0f925b70d101d7014ea81b7094e1159"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
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"current_release_date": "2026-08-13T19:35:58+00:00",
"cve": "CVE-2022-50673",
"id": "CVE-2022-50673",
"initial_release_date": "2022-01-01T00:00:00+00:00",
"product_status:fixed": "1192",
"product_status:known_affected": "36",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ext4: fix use-after-free in ext4_orphan_cleanup",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50673.json",
"version": "3"
},
"suse_vex": {
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"current_release_date": "2026-09-05T17:05:42Z",
"cve": "CVE-2022-50673",
"id": "CVE-2022-50673",
"initial_release_date": "2025-12-10T00:38:14Z",
"product_status:known_affected": "473",
"product_status:known_not_affected": "208",
"product_status:recommended": "258",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2022-50673",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50673.json",
"version": "33"
},
"vulnrichment": {
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{
"metrics": [
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"other": {
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"id": "CVE-2022-50673",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-16T15:48:47.172262Z",
"version": "2.0.3"
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"providerMetadata": {
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"versions": [
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"version": "4.10"
},
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"status": "unaffected",
"version": "0",
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"status": "unaffected",
"version": "4.19.270",
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},
{
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},
{
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{
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},
{
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"status": "unaffected",
"version": "6.1.4",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.2",
"versionType": "original_commit_for_fix"
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"cpeApplicability": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_orphan_cleanup\n\nI caught a issue as follows:\n==================================================================\n BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0\n Read of size 8 at addr ffff88814b13f378 by task mount/710\n\n CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x73/0x9f\n print_report+0x25d/0x759\n kasan_report+0xc0/0x120\n __asan_load8+0x99/0x140\n __list_add_valid+0x28/0x1a0\n ext4_orphan_cleanup+0x564/0x9d0 [ext4]\n __ext4_fill_super+0x48e2/0x5300 [ext4]\n ext4_fill_super+0x19f/0x3a0 [ext4]\n get_tree_bdev+0x27b/0x450\n ext4_get_tree+0x19/0x30 [ext4]\n vfs_get_tree+0x49/0x150\n path_mount+0xaae/0x1350\n do_mount+0xe2/0x110\n __x64_sys_mount+0xf0/0x190\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n \u003c/TASK\u003e\n [...]\n==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\next4_fill_super\n ext4_orphan_cleanup\n --- loop1: assume last_orphan is 12 ---\n list_add(\u0026EXT4_I(inode)-\u003ei_orphan, \u0026EXT4_SB(sb)-\u003es_orphan)\n ext4_truncate --\u003e return 0\n ext4_inode_attach_jinode --\u003e return -ENOMEM\n iput(inode) --\u003e free inode\u003c12\u003e\n --- loop2: last_orphan is still 12 ---\n list_add(\u0026EXT4_I(inode)-\u003ei_orphan, \u0026EXT4_SB(sb)-\u003es_orphan);\n // use inode\u003c12\u003e and trigger UAF\n\nTo solve this issue, we need to propagate the return value of\next4_inode_attach_jinode() appropriately."
}
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"cveId": "CVE-2022-50673",
"datePublished": "2025-12-09T01:29:25.220Z",
"dateReserved": "2025-12-09T01:26:45.991Z",
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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.
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.
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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.
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