{"id":"CVE-2026-64387","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix query directory replay double-free\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 query directory replay double-free\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_query_directory_init…","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","cwe":["CWE-415","CWE-1341"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.6.32, < 6.6.145","linux_kernel >= 6.8.1, < 6.12.96","linux_kernel >= 6.13, < 6.18.39","linux_kernel >= 6.19, < 7.1.4","linux_kernel = 6.8"],"patched":["linux_kernel 7.1.4"],"published":"2026-07-25","updated":"2026-09-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64387","references":[{"url":"https://git.kernel.org/stable/c/00b0fa425941438b664950a8ee65dfba2def4336","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1665f25b1dea30bf2d02e16245d203a944c9d994","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3317a5d015fca976475aa71df224056777316fde","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3409aedf3c81a810243da94164f6621c9d205c98","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9647492b5e41954be59d5157eddbcd4cdc1656f7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64387.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64387"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507046"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64387"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64387"},{"url":"https://lore.kernel.org/linux-cve-announce/2026072526-CVE-2026-64387-ff1a@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:67114"},{"url":"https://access.redhat.com/errata/RHSA-2026:63128"},{"url":"https://access.redhat.com/errata/RHSA-2026:63129"},{"url":"https://access.redhat.com/errata/RHSA-2026:67720"}],"tags":["nvd","csaf","vex","red-hat","score-dispute"],"epss":0.00457,"epssPercentile":0.3898,"ingestedAt":"2026-09-05T13:39:57.309Z","scores":{"nvd":9.8,"vendor":7},"slug":"CVE-2026-64387","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix query directory replay double-free\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_query_directory_init() fails before the next send,\ncleanup retains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free.\n\n## Affected\n\n- `linux_kernel >= 6.6.32, < 6.6.145`\n- `linux_kernel >= 6.8.1, < 6.12.96`\n- `linux_kernel >= 6.13, < 6.18.39`\n- `linux_kernel >= 6.19, < 7.1.4`\n- `linux_kernel = 6.8`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.1.4`\n\n## Vendor advisories\n\n- **RHSA-2026:67114** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67114)\n- **RHSA-2026:63128** · 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 2026-09-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:63128)\n- **RHSA-2026:63129** · 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 2026-09-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:63129)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64387.json)\n- **RHSA-2026:67720** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6) · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:67720)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}