{"id":"CVE-2026-68448","title":"kernel: ovl: check access to copy_file_range source with src mounter creds (CVE-2026-68448)","summary":"A flaw was found in the Linux kernel's overlayfs component. When copying files across different overlay filesystems, the system incorrectly checked read permissions using the destination filesystem's credentials instead of the source's. Th…","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-266","vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","affected":["enterprise_linux 9","enterprise_linux_for_nvidia 26","10base_smtv","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_v_10","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_9","enterprise_linux_codeready_linux_builder_v_10","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":"2026-08-12","updated":"2026-10-23","sourceUpdated":"2026-10-23T04:32:28+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68448.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68448.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-68448"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2514462"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68448"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68448"},{"url":"https://lore.kernel.org/linux-cve-announce/2026081224-CVE-2026-68448-5739@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:88477"},{"url":"https://access.redhat.com/errata/RHSA-2026:87805"},{"url":"https://git.kernel.org/stable/c/7e13e5b087375f1aee1e930503d20efa7084c0fa"},{"url":"https://git.kernel.org/stable/c/46c296aa678828105842eee29a147508d803d926"},{"url":"https://git.kernel.org/stable/c/9ec22c8113d8cf72ed7197bb61037dcad09e50d8"},{"url":"https://git.kernel.org/stable/c/1f4a107439d2e43db176e34919933e617cb7f2c5"},{"url":"https://git.kernel.org/stable/c/a1e0eb8f55cfe09bb31a202a388babc411292656"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00157,"epssPercentile":0.04781,"ingestedAt":"2026-10-21T12:48:53.597Z","slug":"CVE-2026-68448","body":"## Overview\n\nA flaw was found in the Linux kernel's overlayfs component. When copying files across different overlay filesystems, the system incorrectly checked read permissions using the destination filesystem's credentials instead of the source's. This oversight could allow an unauthorized user to read files that should otherwise be restricted, leading to information disclosure.\n\n## Vendor advisories\n\n- **RHSA-2026:88477** · 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 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88477)\n- **RHSA-2026:87805** · 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 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:87805)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux for NVIDIA 26 · no fix planned: Red Hat Enterprise Linux for NVIDIA 26, Red Hat Enterprise Linux 9 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68448.json)\n\n**kernel: ovl: check access to copy_file_range source with src mounter creds** — rated Moderate by Red Hat. Released 2026-08-12, updated 2026-10-23.\n\nAffected:\n\n- Red Hat Enterprise Linux 9\n- Red Hat Enterprise Linux for NVIDIA 26\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. 9)\n- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)\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 Enterprise Linux for NVIDIA 26\n- Red Hat Enterprise Linux 9\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\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-2026:88477\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-2026:87805","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228175,"id":"CVE-2026-68448","ts":1792758154787,"field":"cvss","old":null,"new":"7"},{"seq":228174,"id":"CVE-2026-68448","ts":1792758154787,"field":"severity","old":"none","new":"high"}]}