{"id":"CVE-2026-64597","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_close() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_close() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_close_init() fails b…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","published":"2026-08-06","updated":"2026-08-08","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64597","references":[{"url":"https://git.kernel.org/stable/c/037511726228aaf165c7067ff2bfc88eaecdf1f3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8fee","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64597.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64597"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2511932"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64597"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64597"},{"url":"https://lore.kernel.org/linux-cve-announce/2026080652-CVE-2026-64597-760b@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:64775"},{"url":"https://access.redhat.com/errata/RHSA-2026:66180"}],"tags":["nvd","csaf","vex","red-hat","score-dispute"],"epss":0.00359,"epssPercentile":0.296,"ingestedAt":"2026-08-08T21:30:13.297Z","vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","affected":["enterprise_linux 9","enterprise_linux_for_nvidia 26","openshift_container_platform 4","enterprise_linux_appstream_v_10","enterprise_linux_baseos_v_10","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_real_time_v_10"],"patched":["enterprise_linux_appstream_v_10","enterprise_linux_baseos_v_10","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_real_time_v_10"],"cwe":["CWE-415"],"scores":{"nvd":9.8,"vendor":7},"slug":"CVE-2026-64597","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_close() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_close_init() fails before the next send, cleanup\nretains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:64775** · Red Hat · fixed in: 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 Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64775)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux for NVIDIA 26, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux for NVIDIA 26 · updated 2026-09-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64597.json)\n- **RHSA-2026:66180** · 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 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66180)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}