CVE-2026-64387: smb: client: fix query directory replay double-free

Modified

AliasesUBUNTU-CVE-2026-64387DEBIAN-CVE-2026-64387

Published 25-07-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-64387 is a critical (CVSS 9.8) Double Free vulnerability in linux. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 39.6% of scored vulnerabilities.

Priority

Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?

CVSS score

9.8/10

010

Critical · v3.1 (CVE.org)

EPSS score

0.46%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

25-07-2026
PublishedVulnerability first disclosed.
19-10-2026
Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_directory_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

CVSS metrics

5 scores · 4 sources · 2 versions

v4.07.7v3.19.8

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.46% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-415Double FreeThe product calls free() twice on the same memory address.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu142 products

linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-31.31
linux-allwinner-5.19All versions (No fix recorded)
linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1012.12
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)

linux-aws-5.13All versions (No fix recorded)
linux-aws-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.8All versions (No fix recorded)
linux-aws-6.14All versions (No fix recorded)
linux-aws-6.17All versions (No fix recorded)
linux-aws-6.2All versions (No fix recorded)
linux-aws-6.5All versions (No fix recorded)
linux-aws-6.8All versions (No fix recorded)
linux-aws-7.0< 7.0.0-1012.12~24.04.1
linux-aws-fipsAll versions (No fix recorded) | < 6.8.0-1067.70+fips1
linux-azureAll versions (No fix recorded) | < 6.8.0-1071.79 | < 7.0.0-1014.14
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.8All versions (No fix recorded)
linux-azure-6.11All versions (No fix recorded)
linux-azure-6.14All versions (No fix recorded)
linux-azure-6.17All versions (No fix recorded)
linux-azure-6.2All versions (No fix recorded)
linux-azure-6.5All versions (No fix recorded)
linux-azure-6.8All versions (No fix recorded)
linux-azure-7.0< 7.0.0-1014.14~24.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 6.8.0-1069.76 | < 7.0.0-1013.13
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fde-6.14All versions (No fix recorded)
linux-azure-fde-6.17All versions (No fix recorded)
linux-azure-fde-6.2All versions (No fix recorded)
linux-azure-fde-6.8All versions (No fix recorded)
linux-azure-fde-7.0All versions (No fix recorded) | < 7.0.0-1013.13~24.04.1
linux-azure-fipsAll versions (No fix recorded) | < 6.8.0-1071.79+fips1
linux-azure-nvidiaAll versions (No fix recorded)
linux-azure-nvidia-6.14All versions (No fix recorded)
linux-bluefieldAll versions (No fix recorded) | < 6.8.0-1033.38
linux-fipsAll versions (No fix recorded) | < 6.8.0-147.147+fips1
linux-gcpAll versions (No fix recorded) | < 6.8.0-1071.79 | < 7.0.0-1011.11
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-6.11All versions (No fix recorded)
linux-gcp-6.14All versions (No fix recorded)
linux-gcp-6.17All versions (No fix recorded)
linux-gcp-6.2All versions (No fix recorded)
linux-gcp-6.5All versions (No fix recorded)
linux-gcp-6.8All versions (No fix recorded)
linux-gcp-7.0< 7.0.0-1011.11~24.04.1
linux-gcp-fipsAll versions (No fix recorded) | < 6.8.0-1071.79+fips1
linux-gkeAll versions (No fix recorded) | < 6.8.0-1066.74 | < 7.0.0-1006.7
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15All versions (No fix recorded)
linux-gke-5.4All versions (No fix recorded)
linux-gkeopAll versions (No fix recorded) | < 6.8.0-1052.56
linux-gkeop-5.15All versions (No fix recorded)
linux-gkeop-5.4All versions (No fix recorded)
linux-hweAll versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.19All versions (No fix recorded)
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-6.11All versions (No fix recorded)
linux-hwe-6.14All versions (No fix recorded)
linux-hwe-6.17All versions (No fix recorded)
linux-hwe-6.2All versions (No fix recorded)
linux-hwe-6.5All versions (No fix recorded)
linux-hwe-6.8All versions (No fix recorded)
linux-hwe-7.0< 7.0.0-31.31~24.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-ibmAll versions (No fix recorded) | < 6.8.0-1067.68 | < 7.0.0-1013.13
linux-ibm-6.8All versions (No fix recorded)
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-lowlatencyAll versions (No fix recorded) | < 6.8.0-147.147.1
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lowlatency-hwe-6.11All versions (No fix recorded)
linux-lowlatency-hwe-6.2All versions (No fix recorded)
linux-lowlatency-hwe-6.5All versions (No fix recorded)
linux-lowlatency-hwe-6.8All versions (No fix recorded)
linux-nvidiaAll versions (No fix recorded) | < 7.0.0-1018.18
linux-nvidia-6.11All versions (No fix recorded)
linux-nvidia-6.17All versions (No fix recorded)
linux-nvidia-6.2All versions (No fix recorded)
linux-nvidia-6.5All versions (No fix recorded)
linux-nvidia-6.8All versions (No fix recorded)
linux-nvidia-7.0< 7.0.0-1018.18~24.04.1
linux-nvidia-bos< 7.0.0-2018.18
linux-nvidia-lowlatencyAll versions (No fix recorded)
linux-nvidia-tegra< 6.8.0-1035.38
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14All versions (No fix recorded)
linux-oem-5.17All versions (No fix recorded)
linux-oem-5.6All versions (No fix recorded)
linux-oem-6.0All versions (No fix recorded)
linux-oem-6.1All versions (No fix recorded)
linux-oem-6.11All versions (No fix recorded)
linux-oem-6.14All versions (No fix recorded)
linux-oem-6.17All versions (No fix recorded)
linux-oem-6.5All versions (No fix recorded)
linux-oem-6.8All versions (No fix recorded)
linux-oem-7.0< 7.0.0-1013.13
linux-oracleAll versions (No fix recorded) | < 6.8.0-1064.67 | < 7.0.0-1011.11
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.8All versions (No fix recorded)
linux-oracle-6.14All versions (No fix recorded)
linux-oracle-6.17All versions (No fix recorded)
linux-oracle-6.5All versions (No fix recorded)
linux-oracle-6.8All versions (No fix recorded)
linux-oracle-7.0< 7.0.0-1011.11~24.04.1
linux-raspiAll versions (No fix recorded) | < 7.0.0-1019.19
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 6.8.1-1062.63 | < 7.0.0-31.31.1
linux-realtime-6.14All versions (No fix recorded)
linux-realtime-6.17All versions (No fix recorded)
linux-realtime-6.8All versions (No fix recorded)
linux-riscvAll versions (No fix recorded) | < 7.0.0-31.31.1
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.19All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-riscv-6.14All versions (No fix recorded)
linux-riscv-6.17All versions (No fix recorded)
linux-riscv-6.5All versions (No fix recorded)
linux-riscv-6.8All versions (No fix recorded)
linux-riscv-7.0< 7.0.0-31.31.1~24.04.1
linux-starfive-5.19All versions (No fix recorded)
linux-starfive-6.2All versions (No fix recorded)
linux-starfive-6.5All versions (No fix recorded)
linux-vmwareAll versions (No fix recorded)
linux-xilinxAll versions (No fix recorded)

Show all 142

Debian2 products

linux< 6.12.96-1 | < 7.1.4-1
linux-6.12< 6.12.100-1~deb12u1

Linux2 products

linux≥ 433042a91f9373241307725b52de573933ffedbf, < 3409aedf3c81a810243da94164f6621c9d205c98 | ≥ 4f1fffa2376922f3d1d506e49c0fd445b023a28e, < 1665f25b1dea30bf2d02e16245d203a944c9d994 | ≥ 4f1fffa2376922f3d1d506e49c0fd445b023a28e, < 00b0fa425941438b664950a8ee65dfba2def4336 | ≥ 4f1fffa2376922f3d1d506e49c0fd445b023a28e, < 3317a5d015fca976475aa71df224056777316fde | ≥ 4f1fffa2376922f3d1d506e49c0fd445b023a28e, < 9647492b5e41954be59d5157eddbcd4cdc1656f7 | ≥ 6.6.32, < 6.6.145 | 6.8
linux_kernelEOL≥ 6.6.32, < 6.6.145 | ≥ 6.8.1, < 6.12.96 | ≥ 6.13, < 6.18.39 | ≥ 6.19, < 7.1.4 | 6.8 | 6.8:rc2 | 6.8:rc3 | 6.8:rc4 | 6.8:rc5 | 6.8:rc6 | 6.8:rc7

3 vendors · 146 products