{"id":"CVE-2026-80775","title":"kernel: futex: Fix race on the initial mm->futex.phash.ref allocation (CVE-2026-80775)","summary":"A flaw was found in the Linux kernel. A race condition exists in the `futex_hash_allocate()` function, specifically during the initial allocation of `mm->futex.phash.ref`. This vulnerability can be triggered in scenarios involving nested `…","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-1341","vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","affected":["enterprise_linux 9","10base_smtv","openshift_container_platform 4.22","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","openshift_container_platform 4.22","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":"2026-09-04","updated":"2026-10-26","sourceUpdated":"2026-10-26T09:37:52+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80775.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80775.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80775"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2528550"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80775"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80775"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80775.mbox"},{"url":"https://access.redhat.com/errata/RHSA-2026:76738"},{"url":"https://access.redhat.com/errata/RHSA-2026:79151"},{"url":"https://access.redhat.com/errata/RHSA-2026:74438"},{"url":"https://git.kernel.org/stable/c/86d12b34bafc9a4c271a9edefea88855a934d6e5"},{"url":"https://git.kernel.org/stable/c/ff252ed45c8263525f2f54d81c5fa6d547fba344"},{"url":"https://git.kernel.org/stable/c/c4b4972d8edcdf50b6518f55119e129d2f668a10"},{"url":"https://git.kernel.org/stable/c/bde0238083647381d4747355c5a19115a3422b96"}],"tags":["csaf","vex","red-hat","exploit-available","cve.org"],"epss":0.00185,"epssPercentile":0.08041,"exploits":{"github":1,"githubRepos":["https://github.com/ylh440104/InfinityCore-Android-CVE-2026-80775"],"checkedAt":"2026-10-27T19:14:51.165Z"},"exploitAvailable":true,"ingestedAt":"2026-10-19T10:20:54.955Z","slug":"CVE-2026-80775","body":"## Overview\n\nA flaw was found in the Linux kernel. A race condition exists in the `futex_hash_allocate()` function, specifically during the initial allocation of `mm->futex.phash.ref`. This vulnerability can be triggered in scenarios involving nested `vfork` calls, where a parent and grandchild process might concurrently attempt to set futex hash slots. This race can lead to a use-after-free condition, allowing a task to write into freed memory, which results in memory corruption.\n\n## Vendor advisories\n\n- **RHSA-2026:76738** · 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 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:76738)\n- **RHSA-2026:79151** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:79151)\n- **RHSA-2026:74438** · 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 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74438)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80775.json)\n\n**kernel: futex: Fix race on the initial mm->futex.phash.ref allocation** — rated Moderate by Red Hat. Released 2026-09-04, updated 2026-10-26.\n\nAffected:\n\n- Red Hat Enterprise Linux 9\n\nFixed:\n\n- 10Base-SMTV\n- Red Hat OpenShift Container Platform 4.22\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 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-2026:76738\nFor OpenShift Container Platform 4.22 see the following documentation,\nwhich will be updated shortly for this release, for important instructions\non how to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata\nfor x86_64, s390x, ppc64le, and aarch64 architectures. The image digests\nmay be found at\nhttps://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as fol… https://access.redhat.com/errata/RHSA-2026:79151\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-2026:74438\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.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":227169,"id":"CVE-2026-80775","ts":1792585180464,"field":"cvss","old":null,"new":"7"},{"seq":227168,"id":"CVE-2026-80775","ts":1792585180464,"field":"severity","old":"none","new":"high"}]}