CVE-2021-47012

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After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).\n\nMy patch moves \"mr->mem = mem\" behind the if (xa_alloc_cyclic(..)<0) {}\nsection, to avoid the uaf."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached via local RDMA verbs (REG_MR/alloc_mr) through /dev/infiniband/uverbs*, not by processing remote iWARP packets; a local process must issue the memory-registration syscall path.\nAC:L - An unprivileged attacker can reliably drive xa_alloc_cyclic() failure via memory pressure (GFP_KERNEL), then hit the deterministic UAF/double-free on the err_out path with no race outside their control.\nPR:L - uverbs nodes are created mode 0666 and REG_MR requires no capability; once a SIW device exists, a normal local user can open it and trigger the vulnerable path.\nUI:N - Exploitation needs no victim action beyond the attacker\u2019s own verbs calls on an already-available SIW device.\nS:U - Impact is confined to the local kernel privilege boundary (standard local heap corruption/privilege escalation), with no VM/IOMMU/sandbox escape.\nC:H - Use-after-free of the siw_mem object enables heap reuse and arbitrary kernel memory read primitives per UAF exploitation.\nI:H - The err_out path performs UAF writes and a secondary free via siw_mem_put, yielding classic heap corruption suitable for arbitrary write/control-flow hijack.\nA:H - The UAF/double-free reliably causes kernel oops/panic (and WARN_ON in xa_erase) even without full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/sw/siw/siw_mem.c"], "versions": [{"version": "2251334dcac9eb337575d8767e2a6a7e81848f7f", 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a local process must issue the memory-registration syscall path.\nAC:L - An unprivileged attacker can reliably drive xa_alloc_cyclic() failure via memory pressure (GFP_KERNEL), then hit the deterministic UAF/double-free on the err_out path with no race outside their control.\nPR:L - uverbs nodes are created mode 0666 and REG_MR requires no capability; once a SIW device exists, a normal local user can open it and trigger the vulnerable path.\nUI:N - Exploitation needs no victim action beyond the attacker\u2019s own verbs calls on an already-available SIW device.\nS:U - Impact is confined to the local kernel privilege boundary (standard local heap corruption/privilege escalation), with no VM/IOMMU/sandbox escape.\nC:H - Use-after-free of the siw_mem object enables heap reuse and arbitrary kernel memory read primitives per UAF exploitation.\nI:H - The err_out path performs UAF writes and a secondary free via siw_mem_put, yielding classic heap corruption suitable for arbitrary write/control-flow hijack.\nA:H - The UAF/double-free reliably causes kernel oops/panic (and WARN_ON in xa_erase) even without full exploitation."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2251334dcac9eb337575d8767e2a6a7e81848f7f", "lessThan": "30b9e92d0b5e5d5dc1101ab856c17009537cbca4", "versionType": "git"}, {"status": "affected", "version": "2251334dcac9eb337575d8767e2a6a7e81848f7f", "lessThan": "608a4b90ece039940e9425ee2b39c8beff27e00c", "versionType": "git"}, {"status": "affected", "version": "2251334dcac9eb337575d8767e2a6a7e81848f7f", "lessThan": "3e22b88e02c194f6c80867abfef5cc09383461f4", "versionType": "git"}, {"status": "affected", "version": "2251334dcac9eb337575d8767e2a6a7e81848f7f", "lessThan": "ad9ce7188432650469a6c7625bf479f5ed0b6155", "versionType": "git"}, {"status": "affected", "version": "2251334dcac9eb337575d8767e2a6a7e81848f7f", "lessThan": "3093ee182f01689b89e9f8797b321603e5de4f63", "versionType": "git"}], "programFiles": ["drivers/infiniband/sw/siw/siw_mem.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.3"}, {"status": "unaffected", "version": "0", "lessThan": "5.3", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.119", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.37", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.11.21", "versionType": "semver", "lessThanOrEqual": "5.11.*"}, {"status": "unaffected", "version": "5.12.4", "versionType": "semver", "lessThanOrEqual": "5.12.*"}, {"status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/infiniband/sw/siw/siw_mem.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4"}, {"url": "https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c"}, {"url": "https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4"}, {"url": "https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155"}, {"url": "https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Fix a use after free in siw_alloc_mr\n\nOur code analyzer reported a UAF.\n\nIn siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). 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After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).\n\nMy patch moves \"mr->mem = mem\" behind the if (xa_alloc_cyclic(..)<0) {}\nsection, to avoid the uaf."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.119", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.37", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.11.21", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.12.4", "versionStartIncluding": "5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.13", "versionStartIncluding": "5.3"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:45:33.281Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47012", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:45:33.281Z", "dateReserved": "2024-02-27T18:42:55.953Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-02-28T08:13:30.284Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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In the implementation of\nsiw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via\nkfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a\nfreed object. After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).\n\nMy patch moves \"mr->mem = mem\" behind the if (xa_alloc_cyclic(..)<0) {}\nsection, to avoid the uaf."}, {"lang": "es", "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: RDMA/siw: Corrige un use after free en siw_alloc_mr Nuestro analizador de c\u00f3digo inform\u00f3 un UAF. En siw_alloc_mr(), llama a siw_mr_add_mem(mr,..). En la implementaci\u00f3n de siw_mr_add_mem(), mem se asigna a mr-&gt;mem y luego mem se libera mediante kfree(mem) si xa_alloc_ciclic() falla. Aqu\u00ed, mr-&gt;mem todav\u00eda apunta a un objeto liberado. Despu\u00e9s, la ejecuci\u00f3n contin\u00faa hasta la rama err_out de siw_alloc_mr, y el mr-&gt;mem liberado se usa en siw_mr_drop_mem(mr). Mi parche mueve \"mr-&gt;mem = mem\" detr\u00e1s de la secci\u00f3n if (xa_alloc_ciclic(..)&lt;0) {}, para evitar el uaf."}], "id": "CVE-2021-47012", "lastModified": "2026-08-04T10:16:41.407", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47012", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-02-28T20:34:17.324799Z", "version": "2.0.3"}}]}, "published": "2024-02-28T09:15:38.753", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3093ee182f01689b89e9f8797b321603e5de4f63"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/30b9e92d0b5e5d5dc1101ab856c17009537cbca4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3e22b88e02c194f6c80867abfef5cc09383461f4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/608a4b90ece039940e9425ee2b39c8beff27e00c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad9ce7188432650469a6c7625bf479f5ed0b6155"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: RDMA/siw: Fix a use after free in siw_alloc_mr", "id": "2266844", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266844"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nRDMA/siw: Fix a use after free in siw_alloc_mr\nOur code analyzer reported a UAF.\nIn siw_alloc_mr(), it calls siw_mr_add_mem(mr,..). In the implementation of\nsiw_mr_add_mem(), mem is assigned to mr->mem and then mem is freed via\nkfree(mem) if xa_alloc_cyclic() failed. Here, mr->mem still point to a\nfreed object. After, the execution continue up to the err_out branch of\nsiw_alloc_mr, and the freed mr->mem is used in siw_mr_drop_mem(mr).\nMy patch moves \"mr->mem = mem\" behind the if (xa_alloc_cyclic(..)<0) {}\nsection, to avoid the uaf."], "name": "CVE-2021-47012", "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:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47012\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47012\nhttps://lore.kernel.org/linux-cve-announce/2024022831-CVE-2021-47012-73c5@gregkh/T/#u"], "threat_severity": "Moderate"}

{}