CVE-2024-26769

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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 \u2014 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()` \u2192 `nvmet_fc_ls_create_association()`/`nvmet_fc_ls_disconnect()`) runs before any NVMe-level authentication \u2014 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 \u2014 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": 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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 \u2014 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()` \u2192 `nvmet_fc_ls_create_association()`/`nvmet_fc_ls_disconnect()`) runs before any NVMe-level authentication \u2014 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 \u2014 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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "5e0bc09a52b6169ce90f7ac6e195791adb16cec4", "versionType": "git"}, {"status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8", "versionType": "git"}, {"status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30", "versionType": "git"}, {"status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "1d86f79287206deec36d63b89c741cf542b6cadd", "versionType": "git"}, {"status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "lessThan": "710c69dbaccdac312e32931abcb8499c1525d397", "versionType": "git"}], "programFiles": ["drivers/nvme/target/fc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.8"}, {"status": "unaffected", "version": "0", "lessThan": "4.8", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.150", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.80", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.19", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.7.7", "versionType": "semver", "lessThanOrEqual": "6.7.*"}, {"status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/nvme/target/fc.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/nvme/target/fc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5e0bc09a52b6169ce90f7ac6e195791adb16cec4", "status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "versionType": "git"}, {"lessThan": "9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8", "status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "versionType": "git"}, {"lessThan": "eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30", "status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "versionType": "git"}, {"lessThan": "1d86f79287206deec36d63b89c741cf542b6cadd", "status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "versionType": "git"}, {"lessThan": "710c69dbaccdac312e32931abcb8499c1525d397", "status": "affected", "version": "a07b4970f464f13640e28e16dad6cfa33647cc99", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/nvme/target/fc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.8"}, {"lessThan": "4.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.150", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.80", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.19", "versionType": "semver"}, {"lessThanOrEqual": "6.7.*", "status": "unaffected", "version": "6.7.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7A7524E0-82D9-422E-BD7A-99C27CD188A5", "versionEndExcluding": "5.15.150", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BA7850CE-97C9-4408-A348-6173296BCA2B", "versionEndExcluding": "6.1.80", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8D82004C-B2AE-4048-9344-32EFF65953B0", "versionEndExcluding": "6.6.19", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "575EE16B-67F2-4B5B-B5F8-1877715C898B", "versionEndExcluding": "6.7.7", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*", "matchCriteriaId": "B9F4EA73-0894-400F-A490-3A397AB7A517", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*", "matchCriteriaId": "056BD938-0A27-4569-B391-30578B309EE3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nvmet-fc: evita el punto muerto al eliminar la ruta de asociaci\u00f3n Al eliminar una asociaci\u00f3n, la ruta de cierre se bloquea porque intentamos vaciar el nvmet_wq anidado. Evite este punto muerto al diferir el trabajo colocado en su propio elemento de trabajo."}], "id": "CVE-2024-26769", "lastModified": "2026-08-04T11:17:02.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26769", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-07-16T14:13:29.356049Z", "version": "2.0.3"}}]}, "published": "2024-04-03T17:15:52.853", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1d86f79287206deec36d63b89c741cf542b6cadd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e0bc09a52b6169ce90f7ac6e195791adb16cec4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/710c69dbaccdac312e32931abcb8499c1525d397"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1d86f79287206deec36d63b89c741cf542b6cadd"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e0bc09a52b6169ce90f7ac6e195791adb16cec4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/710c69dbaccdac312e32931abcb8499c1525d397"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9e6987f8937a7bd7516aa52f25cb7e12c0c92ee8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eaf0971fdabf2a93c1429dc6bedf3bbe85dffa30"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:7001", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:7000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.22.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}], "bugzilla": {"description": "kernel: nvmet-fc: avoid deadlock on delete association path", "id": "2273180", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273180"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnvmet-fc: avoid deadlock on delete association path\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."], "name": "CVE-2024-26769", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26769\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26769\nhttps://lore.kernel.org/linux-cve-announce/2024040307-CVE-2024-26769-e9cc@gregkh/T"], "threat_severity": "Low"}

{}