--- 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' --- ## Overview 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 `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. ## Vendor advisories - **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) - **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) - **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) - **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) **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. Affected: - Red Hat Enterprise Linux 9 Fixed: - 10Base-SMTV - Red Hat OpenShift Container Platform 4.22 - Red Hat Enterprise Linux AppStream (v. 10) - Red Hat Enterprise Linux AppStream (v. 9) - Red Hat Enterprise Linux BaseOS (v. 10) - Red Hat Enterprise Linux BaseOS (v. 9) - Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) - Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) - Red Hat Enterprise Linux Hidden (v. 10) - Red Hat Enterprise Linux Real Time for NFV (v. 10) - Red Hat Enterprise Linux Real Time for NFV (v. 9) - Red Hat Enterprise Linux Real Time (v. 10) - Red Hat Enterprise Linux Real Time (v. 9) No fix planned: - Red Hat Enterprise Linux 9 Not affected: - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 8 - Red Hat OpenShift Container Platform 4 ## Remediation For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red 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. Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:76738 For OpenShift Container Platform 4.22 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/release_notes/ You may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags. The sha values for the release are as fol… https://access.redhat.com/errata/RHSA-2026:79151 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red 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. Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:74438 Workarounds / mitigations: - 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.