{"id":"CVE-2021-47203","state":"PUBLISHED","title":"scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()\n\nWhen parsing the txq list in lpfc_drain_txq(), the driver attempts to pass\nthe requests to the adapter. If such an attempt fails, a local \"fail_msg\"\nstring is set and a log message output.  The job is then added to a\ncompletions list for cancellation.\n\nProcessing of any further jobs from the txq list continues, but since\n\"fail_msg\" remains set, jobs are added to the completions list regardless\nof whether a wqe was passed to the adapter.  If successfully added to\ntxcmplq, jobs are added to both lists resulting in list corruption.\n\nFix by clearing the fail_msg string after adding a job to the completions\nlist. This stops the subsequent jobs from being added to the completions\nlist unless they had an appropriate failure.","publishedAt":"2024-04-10T18:56:37.066Z","updatedAt":"2026-08-05T08:46:43.456Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"ad4776b5eb2e58af1226847fcd3b4f6d051674dd","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"ec70d80a8642900086447ba0cdc79e3f44d42e8f","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"f05a0191b90156e539cccc189b9d87ca2a4d9305","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"b291d147d0268e93ad866f8bc820ea14497abc9b","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"16bcbfb56d759c25665f786e33ec633b9508a08f","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"c097bd5a59162156d9c2077a2f58732ffbaa9fca","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"814d3610c4ce86e8cf285b2cdac0057a42e82de5","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"99154581b05c8fb22607afb7c3d66c1bace6aa5d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/lpfc/lpfc_sli.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.36","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.36","versionType":"semver"},{"version":"4.4.293","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.291","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.256","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.218","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.162","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.82","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.5","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/lpfc/lpfc_sli.c"]}],"references":["https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd","https://git.kernel.org/stable/c/ec70d80a8642900086447ba0cdc79e3f44d42e8f","https://git.kernel.org/stable/c/f05a0191b90156e539cccc189b9d87ca2a4d9305","https://git.kernel.org/stable/c/b291d147d0268e93ad866f8bc820ea14497abc9b","https://git.kernel.org/stable/c/16bcbfb56d759c25665f786e33ec633b9508a08f","https://git.kernel.org/stable/c/c097bd5a59162156d9c2077a2f58732ffbaa9fca","https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5","https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47203.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47203","state":"PUBLISHED","datePublished":"2024-04-10T18:56:37.066Z","dateUpdated":"2026-08-05T08:46:43.456Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-03-25T09:12:14.117Z"},"containers":{"cna":{"title":"scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()\n\nWhen parsing the txq list in lpfc_drain_txq(), the driver attempts to pass\nthe requests to the adapter. If such an attempt fails, a local \"fail_msg\"\nstring is set and a log message output.  The job is then added to a\ncompletions list for cancellation.\n\nProcessing of any further jobs from the txq list continues, but since\n\"fail_msg\" remains set, jobs are added to the completions list regardless\nof whether a wqe was passed to the adapter.  If successfully added to\ntxcmplq, jobs are added to both lists resulting in list corruption.\n\nFix by clearing the fail_msg string after adding a job to the completions\nlist. This stops the subsequent jobs from being added to the completions\nlist unless they had an appropriate failure."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"ad4776b5eb2e58af1226847fcd3b4f6d051674dd","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"ec70d80a8642900086447ba0cdc79e3f44d42e8f","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"f05a0191b90156e539cccc189b9d87ca2a4d9305","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"b291d147d0268e93ad866f8bc820ea14497abc9b","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"16bcbfb56d759c25665f786e33ec633b9508a08f","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"c097bd5a59162156d9c2077a2f58732ffbaa9fca","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"814d3610c4ce86e8cf285b2cdac0057a42e82de5","versionType":"git"},{"version":"2a9bf3d011303d8da64cd5e0e7fdd95f0c143984","status":"affected","lessThan":"99154581b05c8fb22607afb7c3d66c1bace6aa5d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/lpfc/lpfc_sli.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.36","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.36","versionType":"semver"},{"version":"4.4.293","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.291","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.256","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.218","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.162","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.82","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.5","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/lpfc/lpfc_sli.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd"},{"url":"https://git.kernel.org/stable/c/ec70d80a8642900086447ba0cdc79e3f44d42e8f"},{"url":"https://git.kernel.org/stable/c/f05a0191b90156e539cccc189b9d87ca2a4d9305"},{"url":"https://git.kernel.org/stable/c/b291d147d0268e93ad866f8bc820ea14497abc9b"},{"url":"https://git.kernel.org/stable/c/16bcbfb56d759c25665f786e33ec633b9508a08f"},{"url":"https://git.kernel.org/stable/c/c097bd5a59162156d9c2077a2f58732ffbaa9fca"},{"url":"https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5"},{"url":"https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - lpfc_drain_txq drains deferred ELS IOCBs on the Emulex FC HBA ELS ring; an adjacent FC/FCoE SAN fabric peer can induce discovery/ELS congestion that queues and drains those jobs, matching other lpfc adjacent-fabric scores.\nAC:L - A fabric attacker can flood ELS/discovery to exhaust SGLs (building a multi-job txq) and fill the WQ so one submit fails then later jobs succeed in the same drain; the sticky fail_msg bug then fires without relying on an uncontrollable memory layout.\nPR:N - The path runs in HBA/worker context on fabric-driven ELS traffic with no host authentication or capabilities required of the SAN peer.\nUI:N - ELS deferral and txq drain run automatically during fabric discovery and link events; no local user action is required.\nS:U - List corruption and resulting UAF stay inside the host kernel lpfc heap under the same OS authority; no VM escape or IOMMU/DMA boundary is crossed.\nC:H - Successfully submitted iocbqs are wrongly list_add'd onto completions while still on txcmplq, yielding list corruption and UAF of iocbq objects (including via iocbq_lookup on HW completion), enabling reclaim-assisted arbitrary read.\nI:H - Cancel invokes cmd_cmpl on the double-listed iocbq while HW completion still references it, producing a UAF with a callable function pointer suitable for heap grooming and control-flow hijack.\nA:H - Corrupted list walks and the subsequent UAF cause kernel oops/panic (or hangs under list corruption), fully denying host and FC storage-path availability."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T08:46:43.456Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"4.4.293"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"4.9.291"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"4.14.256"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"4.19.218"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"5.4.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"5.10.82"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"5.15.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"5.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47203","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-04-10T19:44:44.009129Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:14:01.015Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ec70d80a8642900086447ba0cdc79e3f44d42e8f","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/f05a0191b90156e539cccc189b9d87ca2a4d9305","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/b291d147d0268e93ad866f8bc820ea14497abc9b","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/16bcbfb56d759c25665f786e33ec633b9508a08f","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/c097bd5a59162156d9c2077a2f58732ffbaa9fca","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:32:07.414Z"}}]}}}