CVE-2026-23216

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As soon as complete() is invoked, the\nwaiter (such as iscsit_close_connection()) may wake up and proceed to free\nthe iscsit_conn structure.\n\nIf the waiter frees the memory before the current thread reaches\nspin_unlock_bh(), it results in a KASAN slab-use-after-free as the function\nattempts to release a lock within the already-freed connection structure.\n\nFix this by releasing the spinlock before calling complete()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/iscsi/iscsi_target_util.c"], "versions": [{"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "ba684191437380a07b27666eb4e72748be1ea201", "status": "affected", "versionType": "git"}, {"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "8518f072fc92921418cd9ed4268dd4f3e9a8fd75", "status": "affected", "versionType": "git"}, {"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "275016a551ba1a068a3bd6171b18611726b67110", "status": "affected", "versionType": "git"}, {"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "73b487d44bf4f92942629d578381f89c326ff77f", "status": "affected", "versionType": "git"}, {"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "48fe983e92de2c59d143fe38362ad17ba23ec7f3", "status": "affected", "versionType": "git"}, {"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "3835e49e146a4e6e7787b29465f1a23379b6ec44", "status": "affected", "versionType": "git"}, {"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "9411a89e9e7135cc459178fa77a3f1d6191ae903", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/iscsi/iscsi_target_util.c"], "versions": 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{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23216", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.987Z", "datePublished": "2026-02-18T14:21:53.699Z", "dateUpdated": "2026-10-19T18:35:39.164Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:02:34.053Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count()\n\nIn iscsit_dec_conn_usage_count(), the function calls complete() while\nholding the conn->conn_usage_lock. As soon as complete() is invoked, the\nwaiter (such as iscsit_close_connection()) may wake up and proceed to free\nthe iscsit_conn structure.\n\nIf the waiter frees the memory before the current thread reaches\nspin_unlock_bh(), it results in a KASAN slab-use-after-free as the function\nattempts to release a lock within the already-freed connection structure.\n\nFix this by releasing the spinlock before calling complete()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/iscsi/iscsi_target_util.c"], "versions": [{"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "ba684191437380a07b27666eb4e72748be1ea201", "status": "affected", "versionType": "git"}, {"version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "8518f072fc92921418cd9ed4268dd4f3e9a8fd75", "status": "affected", "versionType": "git"}, {"version": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/target/iscsi/iscsi_target_util.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ba684191437380a07b27666eb4e72748be1ea201", "status": "affected", "version": "e48354ce078c079996f89d715dfa44814b4eba01", "versionType": "git"}, {"lessThan": "8518f072fc92921418cd9ed4268dd4f3e9a8fd75", "status": "affected", "version": "e48354ce078c079996f89d715dfa44814b4eba01", "versionType": "git"}, {"lessThan": "275016a551ba1a068a3bd6171b18611726b67110", "status": "affected", "version": "e48354ce078c079996f89d715dfa44814b4eba01", "versionType": "git"}, {"lessThan": "73b487d44bf4f92942629d578381f89c326ff77f", "status": "affected", "version": "e48354ce078c079996f89d715dfa44814b4eba01", "versionType": "git"}, {"lessThan": "48fe983e92de2c59d143fe38362ad17ba23ec7f3", "status": "affected", "version": "e48354ce078c079996f89d715dfa44814b4eba01", "versionType": "git"}, {"lessThan": "3835e49e146a4e6e7787b29465f1a23379b6ec44", "status": "affected", "version": "e48354ce078c079996f89d715dfa44814b4eba01", "versionType": "git"}, {"lessThan": "9411a89e9e7135cc459178fa77a3f1d6191ae903", "status": "affected", "version": "e48354ce078c079996f89d715dfa44814b4eba01", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/target/iscsi/iscsi_target_util.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.1"}, {"lessThan": "3.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.250", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.200", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.163", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.124", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.70", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.19", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2A068B57-89F0-436B-8831-F30BCBF37F20", "versionEndExcluding": "5.10.250", "versionStartIncluding": "3.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D16F6370-B70F-471C-8363-3A17B0BB1DA9", "versionEndExcluding": "5.15.200", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E9C856E1-4308-4C0B-A973-7DD375DF66C4", "versionEndExcluding": "6.1.163", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "76183B9F-CABE-4E21-A3E3-F0EBF99DC3C7", "versionEndExcluding": "6.6.124", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F3791390-0628-4808-99EF-1ED8ABF60933", "versionEndExcluding": "6.12.70", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7156C23F-009E-4D05-838C-A2DA417B5B8D", "versionEndExcluding": "6.18.10", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count()\n\nIn iscsit_dec_conn_usage_count(), the function calls complete() while\nholding the conn->conn_usage_lock. As soon as complete() is invoked, the\nwaiter (such as iscsit_close_connection()) may wake up and proceed to free\nthe iscsit_conn structure.\n\nIf the waiter frees the memory before the current thread reaches\nspin_unlock_bh(), it results in a KASAN slab-use-after-free as the function\nattempts to release a lock within the already-freed connection structure.\n\nFix this by releasing the spinlock before calling complete()."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscsi: target: iscsi: Correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en iscsit_dec_conn_usage_count()\n\nEn iscsit_dec_conn_usage_count(), la funci\u00f3n llama a complete() mientras mantiene el conn->conn_usage_lock. Tan pronto como se invoca complete(), el proceso en espera (como iscsit_close_connection()) puede despertarse y proceder a liberar la estructura iscsit_conn.\n\nSi el proceso en espera libera la memoria antes de que el hilo actual alcance spin_unlock_bh(), resulta en un KASAN slab-uso despu\u00e9s de liberaci\u00f3n, ya que la funci\u00f3n intenta liberar un bloqueo dentro de la estructura de conexi\u00f3n ya liberada.\n\nEsto se corrige liberando el spinlock antes de llamar a complete()."}], "id": "CVE-2026-23216", "lastModified": "2026-10-19T19:17:42.423", "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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23216", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-10T20:40:21.955601Z", "version": "2.0.3"}}]}, "published": "2026-02-18T15:18:42.957", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/275016a551ba1a068a3bd6171b18611726b67110"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3835e49e146a4e6e7787b29465f1a23379b6ec44"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/48fe983e92de2c59d143fe38362ad17ba23ec7f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73b487d44bf4f92942629d578381f89c326ff77f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8518f072fc92921418cd9ed4268dd4f3e9a8fd75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9411a89e9e7135cc459178fa77a3f1d6191ae903"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba684191437380a07b27666eb4e72748be1ea201"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count()", "id": "2440630", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2440630"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23216", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "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": "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": "2026-02-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23216\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23216\nhttps://lore.kernel.org/linux-cve-announce/2026021800-CVE-2026-23216-6c63@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,ba684191437380a07b27666eb4e72748be1ea201)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,8518f072fc92921418cd9ed4268dd4f3e9a8fd75)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,275016a551ba1a068a3bd6171b18611726b67110)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,73b487d44bf4f92942629d578381f89c326ff77f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,48fe983e92de2c59d143fe38362ad17ba23ec7f3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,3835e49e146a4e6e7787b29465f1a23379b6ec44)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,9411a89e9e7135cc459178fa77a3f1d6191ae903)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.250,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.200,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.163,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.124,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.70,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.10,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19,*]"}}], "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": "2026-04-18T11:57:22.486442+00:00", "value": {"mitigation_remediation": ["Apply a kernel update that includes the iSCSI use\u2011after\u2011free patch, such as the fixed 6.19\u2011rc6 release or newer.", "If an immediate upgrade cannot be performed, disable the iSCSI target service or block iSCSI traffic at the firewall until the kernel is updated.", "After applying the update, reboot the system and review dmesg or kernel logs for any KASAN messages that may indicate remaining issues."], "summary": {"action": "Patch Immediately", "impact": "Kernel use\u2011after\u2011free can cause a crash"}, "threat_synthesis": {"affected_systems": "Linux kernel builds that include the iSCSI target module from the 6.19 release candidates 6.19\u2011rc1 through rc6 are affected. The vulnerability is present in the generic kernel package and is relevant to any distribution that ships those versions without the patch.", "description_and_impact": "A use\u2011after\u2011free error exists in the Linux kernel\u2019s iSCSI target module. The bug arises when the connection usage counter is decreased and the completion callback is executed while still holding the conn_usage_lock. The callback may wake a waiter that frees the iSCSI connection structure before the lock is released, leading the kernel to attempt to unlock a deallocated object. This triggers a KASAN slab\u2011use\u2011after\u2011free notification and results in a kernel crash.", "risk_and_exploitability": "The CVSS score of 7.8 classifies the flaw as high severity, while the EPSS score of less than 1\u202f% indicates a low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog, meaning no confirmed attacks. The iSCSI target interface can be reached over the network, so an attacker with the ability to send iSCSI commands may trigger the use\u2011after\u2011free and cause a kernel panic. No evidence suggests that the flaw can be leveraged for remote code execution; the primary risk is loss of service."}}}}, "created": "2026-02-19T10:19:38.331584+00:00", "updated": "2026-04-18T12:00:05.896059+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}