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TI-2026-33879 Aliases CVE-2026-46155GHSA-r5mc-mc43-5gch

smb/client: fix out-of-bounds read in smb2_compound_op()

Priority MEDIUM 46CWE-125Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00478 41st percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.6.140, 6.12.88, 6.18.30 +2Red Hat: 4 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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 6.6.1406.6.140Patch availableCNA
LinuxLinux6.9 and later6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1Patch availableCNA
  • Linux VendorLinux Affected 6.6.32 to before 6.6.140 Fixed in 6.6.140 Patch available CNA
  • Linux VendorLinux Affected 6.9 and later Fixed in 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.6.32 to before 6.6.140; 6.9 to before 6.12.88; 6.13 to before 6.18.30; 6.19 to before 7.0.7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*7.1 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*7.1 rc2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.6.32 to before 6.6.140; 6.9 to before 6.12.88; 6.13 to before 6.18.30; 6.19 to before 7.0.7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.6.140
  • Fix · CNA Linux (Linux) Fixed in 6.6.140, 6.12.88, 6.18.30, 7.0.7, 7.1

Red Hat 4 advisories

  • RHSA-2026:65708 Released 2026-09-09 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.140.1.el9_6, libperf-5.14.0-570.140.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.140.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.140.1.el9_6, kernel-64k-devel-5.14.0-570.140.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.140.1.el9_6, kernel-64k-5.14.0-570.140.1.el9_6, kernel-64k-core-5.14.0-570.140.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.140.1.el9_6, kernel-rt-64k-5.14.0-570.140.1.el9_6, kernel-rt-64k-core-5.14.0-570.140.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.140.1.el9_6, kernel-rt-core-5.14.0-570.140.1.el9_6, kernel-rt-debug-5.14.0-570.140.1.el9_6 +11
  • RHSA-2026:64767 Released 2026-09-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.103.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.103.1.el10_0, kernel-64k-devel-6.12.0-55.103.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.103.1.el10_0, kernel-64k-6.12.0-55.103.1.el10_0, kernel-64k-core-6.12.0-55.103.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.103.1.el10_0, libperf-6.12.0-55.103.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.103.1.el10_0, kernel-rt-64k-6.12.0-55.103.1.el10_0, kernel-rt-64k-core-6.12.0-55.103.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.103.1.el10_0, kernel-rt-core-6.12.0-55.103.1.el10_0, kernel-rt-debug-6.12.0-55.103.1.el10_0 +11
  • RHSA-2026:36541 Released 2026-07-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.31.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.31.1.el10_2, kernel-64k-devel-6.12.0-211.31.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.31.1.el10_2, kernel-64k-6.12.0-211.31.1.el10_2, kernel-64k-core-6.12.0-211.31.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.31.1.el10_2, libperf-6.12.0-211.31.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.31.1.el10_2, kernel-rt-64k-6.12.0-211.31.1.el10_2, kernel-rt-64k-core-6.12.0-211.31.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.31.1.el10_2, kernel-rt-core-6.12.0-211.31.1.el10_2, kernel-rt-debug-6.12.0-211.31.1.el10_2 +9
Show 1 more Red Hat advisories
  • RHSA-2026:36018 Released 2026-07-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.22.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.22.1.el9_8, kernel-64k-devel-5.14.0-687.22.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.22.1.el9_8, kernel-64k-5.14.0-687.22.1.el9_8, kernel-64k-core-5.14.0-687.22.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.22.1.el9_8, libperf-5.14.0-687.22.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.22.1.el9_8, kernel-rt-64k-5.14.0-687.22.1.el9_8, kernel-rt-64k-core-5.14.0-687.22.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.22.1.el9_8, kernel-rt-core-5.14.0-687.22.1.el9_8, kernel-rt-debug-5.14.0-687.22.1.el9_8 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:65708
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:64767
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:65708
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:64767
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:65708
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:64767
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:64767
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:65708
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:36541
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:64767
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:65708
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-2026-46155
  2. 2026-10-03 Alias added: GHSA-r5mc-mc43-5gch
  3. 2026-10-14 EPSS moved to the 50th–90th percentile
  4. 2026-10-16 CISA SSVC decision points changed
  5. 2026-10-19 Weakness changed · CISA ADP
  6. 2026-10-25 EPSS moved to the below the 50th percentile
  7. 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