{"id":"CVE-2026-68140","title":"kernel: net/iucv: fix use-after-free of a severed iucv_path (CVE-2026-68140)","summary":"A flaw was found in the Linux kernel. This use-after-free vulnerability exists in the `net/iucv` component. When a peer severs a connection, message notifications that still reference the freed connection path remain in a queue. A subseque…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","affected":["enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4","enterprise_linux 6","10base_smtv","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_8","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_hidden_v_10","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_v_10","enterprise_linux_real_time_v_9"],"patched":["10base_smtv","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_8","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_hidden_v_10","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_v_10","enterprise_linux_real_time_v_9"],"published":"2026-08-10","updated":"2026-10-26","sourceUpdated":"2026-10-26T09:32:00+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68140.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68140.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-68140"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2513293"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68140"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68140"},{"url":"https://lore.kernel.org/linux-cve-announce/2026081059-CVE-2026-68140-f4e1@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:83207"},{"url":"https://access.redhat.com/errata/RHSA-2026:83156"},{"url":"https://access.redhat.com/errata/RHSA-2026:89083"},{"url":"https://git.kernel.org/stable/c/5f08c5e50bcb4680069bd3f9edd5728308816ded"},{"url":"https://git.kernel.org/stable/c/c24faf11bd31bfe0500aca12cbdd5a573a954a5d"},{"url":"https://git.kernel.org/stable/c/99ddb33748698296a6f17b9b34aa3d16a406bb3c"},{"url":"https://git.kernel.org/stable/c/23658b350b4107e8292045c2044983fd426fa15d"},{"url":"https://git.kernel.org/stable/c/a5bbaddf69853117f28173c3f5c8fc14c6b2ec82"},{"url":"https://git.kernel.org/stable/c/900cd6d8119b7f3ae5c4bf82f922ff5957df43db"},{"url":"https://git.kernel.org/stable/c/f579582c03ed526281a8450159baf1d35099a85f"},{"url":"https://git.kernel.org/stable/c/be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00275,"epssPercentile":0.19734,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:44:34.964555Z"},"scores":{"vendor":7,"cna":8.8},"ingestedAt":"2026-10-16T17:24:46.843Z","slug":"CVE-2026-68140","body":"## Overview\n\nA flaw was found in the Linux kernel. This use-after-free vulnerability exists in the `net/iucv` component. When a peer severs a connection, message notifications that still reference the freed connection path remain in a queue. A subsequent attempt to process these stale notifications can lead to memory corruption, potentially resulting in a system crash (denial of service) or allowing an attacker to execute arbitrary code.\n\n## Vendor advisories\n\n- **RHSA-2026:83207** · Red Hat · fixed in: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Hidden (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), … · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83207)\n- **RHSA-2026:83156** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:83156)\n- **RHSA-2026:89083** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:89083)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68140.json)\n\n**kernel: net/iucv: fix use-after-free of a severed iucv_path** — rated Important by Red Hat. Released 2026-08-10, updated 2026-10-26.\n\nAffected:\n\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n- Red Hat Enterprise Linux 6\n\nFixed:\n\n- 10Base-SMTV\n- Red Hat Enterprise Linux AppStream (v. 10)\n- Red Hat Enterprise Linux AppStream (v. 9)\n- Red Hat Enterprise Linux BaseOS (v. 10)\n- Red Hat Enterprise Linux BaseOS (v. 8)\n- Red Hat Enterprise Linux BaseOS (v. 9)\n- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)\n- Red Hat Enterprise Linux CRB (v. 8)\n- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)\n- Red Hat Enterprise Linux Hidden (v. 10)\n- Red Hat Enterprise Linux Real Time for NFV (v. 10)\n- Red Hat Enterprise Linux Real Time for NFV (v. 9)\n- Red Hat Enterprise Linux Real Time (v. 10)\n- Red Hat Enterprise Linux Real Time (v. 9)\n\nNo fix planned:\n\n- Red Hat OpenShift Container Platform 4\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n\nNot affected:\n\n- Red Hat Enterprise Linux for NVIDIA 26\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.\n\nBecause of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:83207\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.\n\nBecause of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:83156\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.\n\nBecause of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:89083\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. The upstream Linux kernel community recommends updating to a stable kernel release containing the fix (6.6.148, 6.12.101, 6.18.42, or 7.1.6 depending on the stable series); for Red Hat products, apply the kernel updates provided for the affected product streams.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":229363,"id":"CVE-2026-68140","ts":1793019715884,"field":"cvss","old":"8.8","new":"7"},{"seq":225249,"id":"CVE-2026-68140","ts":1792446350010,"field":"cvss","old":"7","new":"8.8"},{"seq":223660,"id":"CVE-2026-68140","ts":1792238357251,"field":"cvss","old":"8.8","new":"7"}]}