CVE-2026-23148 (GCVE-0-2026-23148)
Vulnerability from cvelistv5 – Published: 2026-02-14 16:01 – Updated: 2026-02-14 16:01
VLAI?
Title
nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference
Summary
In the Linux kernel, the following vulnerability has been resolved:
nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference
There is a race condition in nvmet_bio_done() that can cause a NULL
pointer dereference in blk_cgroup_bio_start():
1. nvmet_bio_done() is called when a bio completes
2. nvmet_req_complete() is called, which invokes req->ops->queue_response(req)
3. The queue_response callback can re-queue and re-submit the same request
4. The re-submission reuses the same inline_bio from nvmet_req
5. Meanwhile, nvmet_req_bio_put() (called after nvmet_req_complete)
invokes bio_uninit() for inline_bio, which sets bio->bi_blkg to NULL
6. The re-submitted bio enters submit_bio_noacct_nocheck()
7. blk_cgroup_bio_start() dereferences bio->bi_blkg, causing a crash:
BUG: kernel NULL pointer dereference, address: 0000000000000028
#PF: supervisor read access in kernel mode
RIP: 0010:blk_cgroup_bio_start+0x10/0xd0
Call Trace:
submit_bio_noacct_nocheck+0x44/0x250
nvmet_bdev_execute_rw+0x254/0x370 [nvmet]
process_one_work+0x193/0x3c0
worker_thread+0x281/0x3a0
Fix this by reordering nvmet_bio_done() to call nvmet_req_bio_put()
BEFORE nvmet_req_complete(). This ensures the bio is cleaned up before
the request can be re-submitted, preventing the race condition.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
431e58d56fcb5ff1f9eb630724a922e0d2a941df , < ee10b06980acca1d46e0fa36d6fb4a9578eab6e4
(git)
Affected: 190f4c2c863af7cc5bb354b70e0805f06419c038 , < 68207ceefd71cc74ce4e983fa9bd10c3122e349b (git) Affected: 190f4c2c863af7cc5bb354b70e0805f06419c038 , < 0fcee2cfc4b2e16e62ff8e0cc2cd8dd24efad65e (git) Affected: 2e2028fcf924d1c6df017033c8d6e28b735a0508 (git) |
||
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"programFiles": [
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"version": "0",
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"version": "6.18.9",
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{
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"version": "6.19",
"versionType": "original_commit_for_fix"
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"vulnerable": true
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference\n\nThere is a race condition in nvmet_bio_done() that can cause a NULL\npointer dereference in blk_cgroup_bio_start():\n\n1. nvmet_bio_done() is called when a bio completes\n2. nvmet_req_complete() is called, which invokes req-\u003eops-\u003equeue_response(req)\n3. The queue_response callback can re-queue and re-submit the same request\n4. The re-submission reuses the same inline_bio from nvmet_req\n5. Meanwhile, nvmet_req_bio_put() (called after nvmet_req_complete)\n invokes bio_uninit() for inline_bio, which sets bio-\u003ebi_blkg to NULL\n6. The re-submitted bio enters submit_bio_noacct_nocheck()\n7. blk_cgroup_bio_start() dereferences bio-\u003ebi_blkg, causing a crash:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000028\n #PF: supervisor read access in kernel mode\n RIP: 0010:blk_cgroup_bio_start+0x10/0xd0\n Call Trace:\n submit_bio_noacct_nocheck+0x44/0x250\n nvmet_bdev_execute_rw+0x254/0x370 [nvmet]\n process_one_work+0x193/0x3c0\n worker_thread+0x281/0x3a0\n\nFix this by reordering nvmet_bio_done() to call nvmet_req_bio_put()\nBEFORE nvmet_req_complete(). This ensures the bio is cleaned up before\nthe request can be re-submitted, preventing the race condition."
}
],
"providerMetadata": {
"dateUpdated": "2026-02-14T16:01:17.575Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/ee10b06980acca1d46e0fa36d6fb4a9578eab6e4"
},
{
"url": "https://git.kernel.org/stable/c/68207ceefd71cc74ce4e983fa9bd10c3122e349b"
},
{
"url": "https://git.kernel.org/stable/c/0fcee2cfc4b2e16e62ff8e0cc2cd8dd24efad65e"
}
],
"title": "nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-23148",
"datePublished": "2026-02-14T16:01:17.575Z",
"dateReserved": "2026-01-13T15:37:45.975Z",
"dateUpdated": "2026-02-14T16:01:17.575Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-23148\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T16:15:54.913\",\"lastModified\":\"2026-02-14T16:15:54.913\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference\\n\\nThere is a race condition in nvmet_bio_done() that can cause a NULL\\npointer dereference in blk_cgroup_bio_start():\\n\\n1. nvmet_bio_done() is called when a bio completes\\n2. nvmet_req_complete() is called, which invokes req-\u003eops-\u003equeue_response(req)\\n3. The queue_response callback can re-queue and re-submit the same request\\n4. The re-submission reuses the same inline_bio from nvmet_req\\n5. Meanwhile, nvmet_req_bio_put() (called after nvmet_req_complete)\\n invokes bio_uninit() for inline_bio, which sets bio-\u003ebi_blkg to NULL\\n6. The re-submitted bio enters submit_bio_noacct_nocheck()\\n7. blk_cgroup_bio_start() dereferences bio-\u003ebi_blkg, causing a crash:\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000028\\n #PF: supervisor read access in kernel mode\\n RIP: 0010:blk_cgroup_bio_start+0x10/0xd0\\n Call Trace:\\n submit_bio_noacct_nocheck+0x44/0x250\\n nvmet_bdev_execute_rw+0x254/0x370 [nvmet]\\n process_one_work+0x193/0x3c0\\n worker_thread+0x281/0x3a0\\n\\nFix this by reordering nvmet_bio_done() to call nvmet_req_bio_put()\\nBEFORE nvmet_req_complete(). This ensures the bio is cleaned up before\\nthe request can be re-submitted, preventing the race condition.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0fcee2cfc4b2e16e62ff8e0cc2cd8dd24efad65e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68207ceefd71cc74ce4e983fa9bd10c3122e349b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee10b06980acca1d46e0fa36d6fb4a9578eab6e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
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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