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TI-2026-45947 Aliases CVE-2026-64383GHSA-j3g4-c7cw-5ch7

smb: client: fix double-free in SMB2_flush() replay

Priority MEDIUM 49CWE-415Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-415 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time. Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful requests.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00457 39th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.6.145, 6.12.96, 6.18.39 +2Red Hat: 4 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.6.32 to before 6.6.1456.6.145Patch availableCNA
LinuxLinux6.8 and later6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2Patch availableCNA
  • Linux VendorLinux Affected 6.6.32 to before 6.6.145 Fixed in 6.6.145 Patch available CNA
  • Linux VendorLinux Affected 6.8 and later Fixed in 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.6.32 to before 6.6.145; 6.8.1 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:-:*:*:*:*:*:*6.8VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*6.8 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*6.8 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*6.8 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:*6.8 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:rc6:*:*:*:*:*:*6.8 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:rc7:*:*:*:*:*:*6.8 rc7VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.6.32 to before 6.6.145; 6.8.1 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:-:*:*:*:*:*:* Versions 6.8 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* Versions 6.8 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:* Versions 6.8 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:* Versions 6.8 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:* Versions 6.8 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:rc6:*:*:*:*:*:* Versions 6.8 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:rc7:*:*:*:*:*:* Versions 6.8 rc7 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.6.145
  • Fix · CNA Linux (Linux) Fixed in 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2

Red Hat 4 advisories

  • RHSA-2026:77219 Released 2026-10-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.147.1.el9_6, libperf-5.14.0-570.147.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.147.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.147.1.el9_6, kernel-64k-devel-5.14.0-570.147.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.147.1.el9_6, kernel-64k-5.14.0-570.147.1.el9_6, kernel-64k-core-5.14.0-570.147.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.147.1.el9_6, kernel-rt-64k-5.14.0-570.147.1.el9_6, kernel-rt-64k-core-5.14.0-570.147.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.147.1.el9_6, kernel-rt-core-5.14.0-570.147.1.el9_6, kernel-rt-debug-5.14.0-570.147.1.el9_6 +11
  • RHSA-2026:77634 Released 2026-10-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.109.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.109.1.el10_0, kernel-64k-devel-6.12.0-55.109.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.109.1.el10_0, kernel-64k-6.12.0-55.109.1.el10_0, kernel-64k-core-6.12.0-55.109.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.109.1.el10_0, libperf-6.12.0-55.109.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.109.1.el10_0, kernel-rt-64k-6.12.0-55.109.1.el10_0, kernel-rt-64k-core-6.12.0-55.109.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.109.1.el10_0, kernel-rt-core-6.12.0-55.109.1.el10_0, kernel-rt-debug-6.12.0-55.109.1.el10_0 +11
  • RHSA-2026:71232 Released 2026-09-24 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.51.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.51.1.el9_8, kernel-64k-devel-5.14.0-687.51.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.51.1.el9_8, kernel-64k-5.14.0-687.51.1.el9_8, kernel-64k-core-5.14.0-687.51.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.51.1.el9_8, libperf-5.14.0-687.51.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.51.1.el9_8, kernel-rt-64k-5.14.0-687.51.1.el9_8, kernel-rt-64k-core-5.14.0-687.51.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.51.1.el9_8, kernel-rt-core-5.14.0-687.51.1.el9_8, kernel-rt-debug-5.14.0-687.51.1.el9_8 +9
Show 1 more Red Hat advisories
  • RHSA-2026:71233 Released 2026-09-24 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.59.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.59.1.el10_2, kernel-64k-devel-6.12.0-211.59.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.59.1.el10_2, kernel-64k-6.12.0-211.59.1.el10_2, kernel-64k-core-6.12.0-211.59.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.59.1.el10_2, libperf-6.12.0-211.59.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.59.1.el10_2, kernel-rt-64k-6.12.0-211.59.1.el10_2, kernel-rt-64k-core-6.12.0-211.59.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.59.1.el10_2, kernel-rt-core-6.12.0-211.59.1.el10_2, kernel-rt-debug-6.12.0-211.59.1.el10_2 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:77219
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:77219
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:77219
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:77219
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:77634
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:77219
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64383
  2. 2026-10-03 Alias added: GHSA-j3g4-c7cw-5ch7
  3. 2026-10-08 Fix available: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux AppStream EUS (v.9.6) +7 · Red Hat
  4. 2026-10-09 Fix available: RHSA-2026:77219 · Red Hat
  5. 2026-10-09 Fix available: RHSA-2026:77634 · Red Hat
  6. 2026-10-16 CISA SSVC decision points changed
  7. 2026-10-20 Weakness changed · CISA ADP
  8. 2026-10-29 Affected versions changed · Red Hat

References

Patch 5

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences