CVE-2026-23429

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23429", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.016Z", "datePublished": "2026-04-03T15:15:15.856Z", "dateUpdated": "2026-08-05T12:21:42.311Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:21:42.311Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/sva: Fix crash in iommu_sva_unbind_device()\n\ndomain->mm->iommu_mm can be freed by iommu_domain_free():\n iommu_domain_free()\n mmdrop()\n __mmdrop()\n mm_pasid_drop()\nAfter iommu_domain_free() returns, accessing domain->mm->iommu_mm may\ndereference a freed mm structure, leading to a crash.\n\nFix this by moving the code that accesses domain->mm->iommu_mm to before\nthe call to iommu_domain_free()."}], "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 vulnerable `iommu_sva_unbind_device()` path is reached through local character/DRM/UIO accelerator device open and release paths, not by remote packets or adjacent-link traffic.\nAC:L - The attacker can deterministically create the lifetime pattern with normal open/fork/exit/close or file-descriptor transfer so the bound `mm` is finally dropped during unbind; no uncontrollable race is required.\nPR:L - The attacker needs local access to an SVA-capable user-exposed accelerator/UIO/idxd device node. The IOMMU SVA bind/unbind path itself has no CAP_* gate, and these devices are intended to be usable by local user processes.\nUI:N - Exploitation can be driven entirely by the attacker's own process and file descriptors. No separate victim action is required.\nS:U - The bug corrupts kernel memory from within a kernel subsystem and does not directly cross a VM, container, or IOMMU/DMA protection boundary. This is standard local kernel compromise scope.\nC:H - The stale `iommu_mm` object is used after it may be freed, and freed-object reuse can provide attacker-influenced data exposure primitives. Per the required guidance, use-after-free is scored as high confidentiality impact.\nI:H - The old code can perform list operations on freed memory after `iommu_domain_free()`, creating a plausible kernel heap/list corruption and arbitrary-write primitive. Per the required guidance, use-after-free is scored as high integrity impact.\nA:H - The documented failure mode is a kernel crash from dereferencing or manipulating freed `mm`/IOMMU SVA state. A kernel oops or panic is high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/iommu-sva.c"], "versions": [{"version": "9f0a7ab700f8620e433b05c57fbd26c92ea186d9", "lessThan": "58abeb7b9562f25bdfa2f5ae5ce803eb02e74433", "status": "affected", "versionType": "git"}, {"version": "e37d5a2d60a338c5917c45296bac65da1382eda5", "lessThan": "f5daaa2c959d9f894fb5b1ab76da8612dd220a0d", "status": "affected", "versionType": "git"}, {"version": "e37d5a2d60a338c5917c45296bac65da1382eda5", "lessThan": "06e14c36e20b48171df13d51b89fe67c594ed07a", "status": "affected", "versionType": "git"}, {"version": "6.18.7", "lessThan": "6.18.20", "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/iommu/iommu-sva.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.18.7", "versionEndExcluding": "6.18.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/58abeb7b9562f25bdfa2f5ae5ce803eb02e74433"}, {"url": "https://git.kernel.org/stable/c/f5daaa2c959d9f894fb5b1ab76da8612dd220a0d"}, {"url": "https://git.kernel.org/stable/c/06e14c36e20b48171df13d51b89fe67c594ed07a"}], "title": "iommu/sva: Fix crash in iommu_sva_unbind_device()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/iommu/iommu-sva.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "58abeb7b9562f25bdfa2f5ae5ce803eb02e74433", "status": "affected", "version": "9f0a7ab700f8620e433b05c57fbd26c92ea186d9", "versionType": "git"}, {"lessThan": "f5daaa2c959d9f894fb5b1ab76da8612dd220a0d", "status": "affected", "version": "e37d5a2d60a338c5917c45296bac65da1382eda5", "versionType": "git"}, {"lessThan": "06e14c36e20b48171df13d51b89fe67c594ed07a", "status": "affected", "version": "e37d5a2d60a338c5917c45296bac65da1382eda5", "versionType": "git"}, {"lessThan": "6.18.20", "status": "affected", "version": "6.18.7", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/iommu/iommu-sva.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.20", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9D50780B-8F7F-4376-BF4F-15D126B49AAD", "versionEndExcluding": "6.18.20", "versionStartIncluding": "6.18.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D70DEFFE-AC47-4F3A-A2B2-2D67AB4CF3C8", "versionEndExcluding": "6.19.10", "versionStartIncluding": "6.19.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*", "matchCriteriaId": "35C8A871-4971-433E-A046-FC9F7B7D190A", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/sva: Fix crash in iommu_sva_unbind_device()\n\ndomain->mm->iommu_mm can be freed by iommu_domain_free():\n iommu_domain_free()\n mmdrop()\n __mmdrop()\n mm_pasid_drop()\nAfter iommu_domain_free() returns, accessing domain->mm->iommu_mm may\ndereference a freed mm structure, leading to a crash.\n\nFix this by moving the code that accesses domain->mm->iommu_mm to before\nthe call to iommu_domain_free()."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niommu/sva: Corrige un fallo en iommu_sva_unbind_device()\n\ndomain -> mm -> iommu_mm puede ser liberado por iommu_domain_free():\n iommu_domain_free()\n mmdrop()\n __mmdrop()\n mm_pasid_drop()\nDespu\u00e9s de que iommu_domain_free() retorna, acceder a domain -> mm -> iommu_mm puede desreferenciar una estructura mm liberada, lo que lleva a un fallo.\n\nSoluciona esto moviendo el c\u00f3digo que accede a domain -> mm -> iommu_mm a antes de la llamada a iommu_domain_free()."}], "id": "CVE-2026-23429", "lastModified": "2026-07-24T21:10:00.143", "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": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-03T16:16:24.210", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06e14c36e20b48171df13d51b89fe67c594ed07a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/58abeb7b9562f25bdfa2f5ae5ce803eb02e74433"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f5daaa2c959d9f894fb5b1ab76da8612dd220a0d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: iommu/sva: Fix crash in iommu_sva_unbind_device()", "id": "2454837", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454837"}, "csaw": false, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel. Specifically, within the input/output memory management unit (IOMMU) subsystem, a memory management error can occur. When the `iommu_sva_unbind_device()` function is called, it may attempt to access a memory area that has already been freed. This can lead to a system crash, resulting in a denial of service for affected systems."], "name": "CVE-2026-23429", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not 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": "2026-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23429\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23429\nhttps://lore.kernel.org/linux-cve-announce/2026040310-CVE-2026-23429-2f24@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9f0a7ab700f8620e433b05c57fbd26c92ea186d9,58abeb7b9562f25bdfa2f5ae5ce803eb02e74433)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e37d5a2d60a338c5917c45296bac65da1382eda5,f5daaa2c959d9f894fb5b1ab76da8612dd220a0d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e37d5a2d60a338c5917c45296bac65da1382eda5,06e14c36e20b48171df13d51b89fe67c594ed07a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.20,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.10,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-28T16:44:56.918418+00:00", "value": {"mitigation_remediation": ["Upgrade the Linux kernel to a version that contains the iommu_sva_unbind_device() fix (commit 06e14c36e20b).", "After updating, restart any services that unbind IOMMU devices, such as VFIO or libvirt, to ensure they operate with the new kernel.", "If a kernel update cannot be applied immediately, disable IOMMU during boot by adding the 'iommu=off' parameter to the kernel command line and reboot the system."], "summary": {"action": "Patch", "impact": "Denial of Service (Kernel Crash)"}, "threat_synthesis": {"affected_systems": "The flaw affects the Linux kernel, specifically any distribution that employs the iommu/sva IOMMU implementation. No particular vendor versions are identified in the data, so all kernels that include the vulnerable code path are potentially affected until the fix is applied.", "description_and_impact": "A use\u2011after\u2011free occurs in the Linux kernel when iommu_sva_unbind_device() accesses a freed mm structure after iommu_domain_free() has released domain->mm->iommu_mm. This results in a kernel crash. The vulnerability is purely a denial\u2011of\u2011service issue that compromises system availability.", "risk_and_exploitability": "The reported CVSS score of 7.8 and an EPSS score of less than 1% indicate a high severity but very low probability of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog. Exploitation would require local kernel access, as a remote attacker would need to inject code into kernel space to trigger the crash. The intrinsic nature of the bug means that exploitation would lead to a hard reboot or crash rather than data exfiltration or privilege escalation."}}}}, "created": "2026-04-03T21:14:08.943491+00:00", "updated": "2026-04-28T16:45:06.186926+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}