{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23148", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.975Z", "datePublished": "2026-02-14T16:01:17.575Z", "dateUpdated": "2026-08-05T12:20:22.785Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:22.785Z" }, "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->ops->queue_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->bi_blkg to NULL\n6. The re-submitted bio enters submit_bio_noacct_nocheck()\n7. blk_cgroup_bio_start() dereferences bio->bi_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": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The nvmet (NVMe target) subsystem is reachable over the network via nvmet-tcp on TCP port 4420, allowing a remote NVMe-oF initiator to send I/O commands that trigger the vulnerable bio completion path.\nAC:L - The attacker controls both sides of the race by sending concurrent I/O commands at high queue depth over nvmet-tcp; the race between bio completion and request re-submission via the workqueue is reliably triggerable under load, as confirmed by the real crash trace in the commit message.\nPR:N - NVMe-oF over TCP does not require authentication by default; DH-HMAC-CHAP auth is optional and commonly not configured, and the hostnqn in the connect command is an unauthenticated string that can be spoofed.\nUI:N - No user interaction is required; the attacker autonomously sends NVMe I/O commands over the network to trigger the race condition.\nS:U - The vulnerability crashes the kernel within the same security authority; there is no crossing of security boundaries such as VM escape or sandbox bypass.\nC:N - The immediate impact is a NULL pointer dereference crash; no information is disclosed to the attacker as the kernel panics without leaking memory contents back over the network.\nI:N - The bug results in a kernel crash via NULL dereference, not data modification; the bio_uninit zeroing of fields on the live bio does not give the attacker a write primitive that could modify persistent data.\nA:H - The NULL pointer dereference in blk_cgroup_bio_start causes a kernel oops/panic, completely crashing the system and denying service to all users; this is remotely triggerable and repeatable." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/target/io-cmd-bdev.c" ], "versions": [ { "version": "431e58d56fcb5ff1f9eb630724a922e0d2a941df", "lessThan": "ee10b06980acca1d46e0fa36d6fb4a9578eab6e4", "status": "affected", "versionType": "git" }, { "version": "190f4c2c863af7cc5bb354b70e0805f06419c038", "lessThan": "68207ceefd71cc74ce4e983fa9bd10c3122e349b", "status": "affected", "versionType": "git" }, { "version": "190f4c2c863af7cc5bb354b70e0805f06419c038", "lessThan": "0fcee2cfc4b2e16e62ff8e0cc2cd8dd24efad65e", "status": "affected", "versionType": "git" }, { "version": "2e2028fcf924d1c6df017033c8d6e28b735a0508", "status": "affected", "versionType": "git" }, { "version": "6.12.37", "lessThan": "6.12.69", "status": "affected", "versionType": "semver" }, { "version": "6.15.6", "lessThan": "6.16", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/target/io-cmd-bdev.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.69", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.9", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.37", "versionEndExcluding": "6.12.69" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15.6" } ] } ] } ], "references": [ { "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" } } } }