{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26769", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.175Z", "datePublished": "2024-04-03T17:00:56.019Z", "dateUpdated": "2026-08-05T11:27:08.686Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:08.686Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-fc: avoid deadlock on delete association path\n\nWhen deleting an association the shutdown path is deadlocking because we\ntry to flush the nvmet_wq nested. Avoid this by deadlock by deferring\nthe put work into its own work item." } ], "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 - nvmet-fc is the in-kernel NVMe-over-Fibre-Channel target; the association-delete path is driven by FC-NVMe Link Service traffic (Create/Disconnect Association) received from a remote initiator via `nvmet_fc_rcv_ls_req()`, and the deadlocking put occurs in the completion of the target-generated Disconnect Association LS. This matches the treatment of other NVMe target transports (nvmet-tcp/nvmet-fc) as network-reachable, and is consistent with CVE-2025-40171 on the same code.\nAC:L - A remote peer controls both sides of the race — it repeatedly creates associations and issues Disconnect Association LSes (or drops connectivity, triggering `nvmet_fc_invalidate_host()`), driving `del_work` and the LS completion onto `nvmet_wq` at will while the targetport reference count is winding down. No memory grooming or attacker-independent condition is required, and the trigger can be retried indefinitely.\nPR:N - FC-NVMe Link Service handling (`nvmet_fc_handle_ls_rqst()` → `nvmet_fc_ls_create_association()`/`nvmet_fc_ls_disconnect()`) runs before any NVMe-level authentication — it is the connect handshake itself, so no credentials or privileges are needed to reach the vulnerable teardown path.\nUI:N - The deadlock is reached purely through LS traffic processed asynchronously on `nvmet_wq` plus normal target-port teardown; no action by a local user or administrator on the victim is required to trigger it.\nS:U - The deadlock is confined to the kernel's NVMe target subsystem and its workqueue; no security boundary (VM, IOMMU, sandbox) is crossed and no other security authority's resources are affected.\nC:N - The bug is a nested workqueue flush that hangs; there is no out-of-bounds read, no use-after-free, and no path by which memory contents are exposed to the attacker.\nI:N - No memory is corrupted and no data is modified — the fix merely defers an existing `kref_put()` into its own work item, so there is no write primitive or control-flow impact.\nA:H - `fcloop_targetport_delete()` calls `flush_work()` on the work item that is itself executing, deadlocking a `nvmet_wq` kworker permanently; this wedges the shared WQ_MEM_RECLAIM `nvmet_wq` used by all nvmet transports and blocks `nvmet_fc_unregister_targetport()`/`nvmet_fc_exit_module()` in `flush_workqueue()` forever, requiring a reboot." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/target/fc.c" ], "versions": [ { "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "5e0bc09a52b6169ce90f7ac6e195791adb16cec4", "status": "affected", "versionType": "git" }, { "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8", "status": "affected", "versionType": "git" }, { "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30", "status": "affected", "versionType": "git" }, { "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "1d86f79287206deec36d63b89c741cf542b6cadd", "status": "affected", "versionType": "git" }, { "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "710c69dbaccdac312e32931abcb8499c1525d397", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/target/fc.c" ], "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.150", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.80", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.19", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.7", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "4.8", "versionEndExcluding": "5.15.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.7.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5e0bc09a52b6169ce90f7ac6e195791adb16cec4" }, { "url": "https://git.kernel.org/stable/c/9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8" }, { "url": "https://git.kernel.org/stable/c/eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30" }, { "url": "https://git.kernel.org/stable/c/1d86f79287206deec36d63b89c741cf542b6cadd" }, { "url": "https://git.kernel.org/stable/c/710c69dbaccdac312e32931abcb8499c1525d397" } ], "title": "nvmet-fc: avoid deadlock on delete association path", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], 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"references": [ { "url": "https://git.kernel.org/stable/c/5e0bc09a52b6169ce90f7ac6e195791adb16cec4", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/1d86f79287206deec36d63b89c741cf542b6cadd", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/710c69dbaccdac312e32931abcb8499c1525d397", "tags": [ "x_transferred" ] } ] } ] } }