fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 47 fixed, 1 without a fix
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: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath When cifs_sanitize_prepath is called with an empty string or a string containing only delimiters (e.g., "/"), the current logic attempts to check *(cursor2 - 1) before cursor2 has advanced. This results in an out-of-bounds read. This patch adds an early exit check after stripping prepended delimiters. If no path content remains, the function returns NULL. The bug was identified via manual audit and verified using a standalone test case compiled with AddressSanitizer, which triggered a SEGV on affected inputs.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.15.11 to before 5.15.209 | 5.15.209 | Patch available | CNA |
| Linux | Linux | 5.16 and later | 5.15.209, 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0 | Patch available | CNA |
- Linux VendorLinux Affected 5.15.11 to before 5.15.209 Fixed in 5.15.209 Patch available CNA
- Linux VendorLinux Affected 5.16 and later Fixed in 5.15.209, 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0 Patch available CNA
CPE configurations NVD · 11
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.16.1 to before 6.6.136; 6.7 to before 6.12.83; 6.13 to before 6.18.24; 6.19 to before 6.19.14 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:-:*:*:*:*:*:* | 5.16 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:* | 5.16 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc7:*:*:*:*:*:* | 5.16 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc8:*:*:*:*:*:* | 5.16 rc8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | 7.0 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* | 7.0 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* | 7.0 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* | 7.0 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* | 7.0 rc5 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.16.1 to before 6.6.136; 6.7 to before 6.12.83; 6.13 to before 6.18.24; 6.19 to before 6.19.14 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:-:*:*:*:*:*:* Versions 5.16 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:* Versions 5.16 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc7:*:*:*:*:*:* Versions 5.16 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc8:*:*:*:*:*:* Versions 5.16 rc8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* Versions 7.0 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* Versions 7.0 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* Versions 7.0 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* Versions 7.0 rc5 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.209
- Fix · CNA Linux (Linux) Fixed in 5.15.209, 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0
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Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:53990 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:34911 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:36018 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:59662 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:56573 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:52764 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:53990 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:34911, RHSA-2026:62642 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2026:36366, RHSA-2026:62637 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:36018, RHSA-2026:62640 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2026:53989 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2026:52649, RHSA-2026:62558 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2026:59662, RHSA-2026:62638 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Fixed | RHSA-2026:56573, RHSA-2026:62639 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:52764 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2026:53990, RHSA-2026:62641 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) | Fixed | RHSA-2026:53989 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2026:52649 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:36366 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:34911 |
| 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-2026:52764 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2026:36365 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2026:36365 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2026:34911 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2026:36018 |
| Red Hat Enterprise Linux Real Time E4S (v.9.2) | Fixed | RHSA-2026:59663 |
| Red Hat Enterprise Linux Real Time E4S (v.9.4) | Fixed | RHSA-2026:56573 |
| Red Hat Enterprise Linux Real Time EUS (v. 10.0) | Fixed | RHSA-2026:52764 |
| Red Hat Enterprise Linux Real Time EUS (v.9.6) | Fixed | RHSA-2026:53990 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2026:34911 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2026:36018 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) | Fixed | RHSA-2026:59663 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) | Fixed | RHSA-2026:56573 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) | Fixed | RHSA-2026:52764 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) | Fixed | RHSA-2026:53990 |
| Red Hat OpenShift Container Platform 4.12 | Fixed | RHSA-2026:59831 |
| Red Hat OpenShift Container Platform 4.13 | Fixed | RHSA-2026:65839 |
| Red Hat OpenShift Container Platform 4.14 | Fixed | RHSA-2026:62409 |
| Red Hat OpenShift Container Platform 4.15 | Fixed | RHSA-2026:67857 |
| Red Hat OpenShift Container Platform 4.16 | Fixed | RHSA-2026:62549 |
| Red Hat OpenShift Container Platform 4.17 | Fixed | RHSA-2026:60019 |
| Red Hat OpenShift Container Platform 4.18 | Fixed | RHSA-2026:65851 |
| Red Hat OpenShift Container Platform 4.19 | Fixed | RHSA-2026:57402 |
| Red Hat OpenShift Container Platform 4.20 | Fixed | RHSA-2026:57543 |
| Red Hat OpenShift Container Platform 4.21 | Fixed | RHSA-2026:57457 |
| Red Hat OpenShift Container Platform 4.22 | Fixed | RHSA-2026:40764 |
Not affected: 3 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-43112
- 2026-10-03 Alias added: GHSA-24h4-22f3-65qc
- 2026-10-09 Affected versions changed · Red Hat
- 2026-10-16 EPSS moved to the below the 50th percentile
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → MEDIUM
- 2026-10-19 Weakness changed · CISA ADP
References
Patch 5
- https://git.kernel.org/stable/c/5d4fe469fe7dbff7d874c196bb680a82f2625d95
- https://git.kernel.org/stable/c/2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439
- https://git.kernel.org/stable/c/86f9c23e0814cfdffda9eedf0c591c51ba209010
- https://git.kernel.org/stable/c/49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3
- https://git.kernel.org/stable/c/78ec5bf2f589ec7fd8f169394bfeca541b077317
More Linux Kernel vulnerabilities
- 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
Sources
- CVE-2026-43112 · CVE Program
- CVE-2026-43112 · NVD
- FIRST EPSS
- GHSA-24h4-22f3-65qc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-43112 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences