{"id":"CVE-2026-64266","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: re-lock request before returning from fuse_ref_folio()\n\nfuse_ref_folio() unlocks the request but does not re-lock it before\nreturning","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: re-lock request before returning from fuse_ref_folio()\n\nfuse_ref_folio() unlocks the request but does not re-lock it before\nreturning. fuse_chan_abort() can end t…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","published":"2026-07-25","updated":"2026-07-27","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64266","references":[{"url":"https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64266.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64266"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507098"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64266"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64266"},{"url":"https://lore.kernel.org/linux-cve-announce/2026072558-CVE-2026-64266-67e6@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:88477"},{"url":"https://access.redhat.com/errata/RHSA-2026:87375"},{"url":"https://access.redhat.com/errata/RHSA-2026:87374"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00127,"epssPercentile":0.02364,"ingestedAt":"2026-07-27T06:16:49.696Z","vendor":"Linux","product":"Linux","affected":["Linux >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 1f9156714592356b4fda57beac7eab9c2a462dd3","Linux >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 5630da218a45ba80f0aba0846cbe8aa655da122b","Linux >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 1ca605cfa59377f0143fb35b5b01360f37d1b7c4","Linux >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 0e4a5a000123d81234e27a2f8187688cf608f755","Linux >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < e6aa539720c3d8def69683ed0c07cf9faea4e8be","Linux >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < be353caffa8640f5e25fb3714ce8b0cef5e410e5","Linux >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < 65a1c2551f7e16085acbb54aedde1feaa559ba7a","Linux >= c3021629a0d820247ee12b6c5192a1d5380e21c6 < b5befa80fdbe287a98480effed9564712924add5","Linux 2.6.35"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:38:01.546912Z"},"patched":["10base_smtv","enterprise_linux_appstream_v_10","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_8","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_hidden_v_10","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_nfv_v_8","enterprise_linux_real_time_v_10","enterprise_linux_rt_v_8"],"cwe":["CWE-825"],"scores":{"nvd":7.8,"vendor":7},"slug":"CVE-2026-64266","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfuse: re-lock request before returning from fuse_ref_folio()\n\nfuse_ref_folio() unlocks the request but does not re-lock it before\nreturning. fuse_chan_abort() can end the request and the async end\ncallback (eg fuse_writepage_free()) can free the args while the\nsubsequent copy chain logic after fuse_ref_folio() accesses them,\nleading to use-after-free issues.\n\nFix this by locking the request in fuse_ref_folio() before returning.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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-2026:87375** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87375)\n- **RHSA-2026:87374** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87374)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64266.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}