CVE-2026-43090

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43090", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.984Z", "datePublished": "2026-05-06T07:40:23.286Z", "dateUpdated": "2026-05-11T22:17:32.208Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:17:32.208Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix refcount leak in xfrm_migrate_policy_find\n\nsyzkaller reported a memory leak in xfrm_policy_alloc:\n\n BUG: memory leak\n unreferenced object 0xffff888114d79000 (size 1024):\n comm \"syz.1.17\", pid 931\n ...\n xfrm_policy_alloc+0xb3/0x4b0 net/xfrm/xfrm_policy.c:432\n\nThe root cause is a double call to xfrm_pol_hold_rcu() in\nxfrm_migrate_policy_find(). The lookup function already returns\na policy with held reference, making the second call redundant.\n\nRemove the redundant xfrm_pol_hold_rcu() call to fix the refcount\nimbalance and prevent the memory leak.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_policy.c"], "versions": [{"version": "563d5ca93e883b9dcb4b7dc8967ac569fd91820d", "lessThan": "21e235a36cfb6d145cefb10728f12f5dc5412f54", "status": "affected", "versionType": "git"}, {"version": "563d5ca93e883b9dcb4b7dc8967ac569fd91820d", "lessThan": "836ee1b0426ea3db31531e9581cc32f513d24e32", "status": "affected", "versionType": "git"}, {"version": "563d5ca93e883b9dcb4b7dc8967ac569fd91820d", "lessThan": "70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a", "status": "affected", "versionType": "git"}, {"version": "563d5ca93e883b9dcb4b7dc8967ac569fd91820d", "lessThan": "83317cce60a032c49480dcdabe146435bd689d03", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_policy.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "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": "6.12", "versionEndExcluding": "6.12.83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/21e235a36cfb6d145cefb10728f12f5dc5412f54"}, {"url": "https://git.kernel.org/stable/c/836ee1b0426ea3db31531e9581cc32f513d24e32"}, {"url": "https://git.kernel.org/stable/c/70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a"}, {"url": "https://git.kernel.org/stable/c/83317cce60a032c49480dcdabe146435bd689d03"}], "title": "xfrm: fix refcount leak in xfrm_migrate_policy_find", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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The lookup function already returns\na policy with held reference, making the second call redundant.\n\nRemove the redundant xfrm_pol_hold_rcu() call to fix the refcount\nimbalance and prevent the memory leak.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxfrm: solucionar fuga de refcount en xfrm_migrate_policy_find\n\nsyzkaller inform\u00f3 una fuga de memoria en xfrm_policy_alloc:\n\n BUG: fuga de memoria\n objeto sin referencia 0x ffff888114d79000 (tama\u00f1o 1024):\n comm \u2019syz.1.17\u2019, pid 931\n ...\n xfrm_policy_alloc+0xb3/0x4b0 net/xfrm/xfrm_policy.c:432\n\nLa causa ra\u00edz es una doble llamada a xfrm_pol_hold_rcu() en xfrm_migrate_policy_find(). La funci\u00f3n de b\u00fasqueda ya devuelve una pol\u00edtica con referencia retenida, haciendo que la segunda llamada sea redundante.\n\nEliminar la llamada redundante a xfrm_pol_hold_rcu() para solucionar el desequilibrio de refcount y prevenir la fuga de memoria.\n\nEncontrado por Linux Verification Center (linuxtesting.org) con Syzkaller."}], "id": "CVE-2026-43090", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"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": "2026-05-06T10:16:22.313", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/21e235a36cfb6d145cefb10728f12f5dc5412f54"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/83317cce60a032c49480dcdabe146435bd689d03"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/836ee1b0426ea3db31531e9581cc32f513d24e32"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: xfrm: fix refcount leak in xfrm_migrate_policy_find", "id": "2467017", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467017"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel. A memory leak can occur in the xfrm (IP eXtensible FRamework) subsystem due to a reference count imbalance. This issue arises from a double call to xfrm_pol_hold_rcu() within the xfrm_migrate_policy_find() function, leading to unreferenced objects and potential resource exhaustion over time."], "name": "CVE-2026-43090", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "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": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43090\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43090\nhttps://lore.kernel.org/linux-cve-announce/2026050617-CVE-2026-43090-dec5@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[563d5ca93e883b9dcb4b7dc8967ac569fd91820d,21e235a36cfb6d145cefb10728f12f5dc5412f54)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[563d5ca93e883b9dcb4b7dc8967ac569fd91820d,836ee1b0426ea3db31531e9581cc32f513d24e32)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[563d5ca93e883b9dcb4b7dc8967ac569fd91820d,70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[563d5ca93e883b9dcb4b7dc8967ac569fd91820d,83317cce60a032c49480dcdabe146435bd689d03)"}}], "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": "generic", "value": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.83,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.24,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.14,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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"}], "created": "2026-05-06T12:00:02.920342+00:00", "updated": "2026-05-19T21:30:14.359246+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}