cifs: potential buffer overflow in handling symlinks
Priority MEDIUM 43CWE-120Published · 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
- Partial Red Hat: 19 fixed, 3 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: cifs: potential buffer overflow in handling symlinks Smatch printed a warning: arch/x86/crypto/poly1305_glue.c:198 poly1305_update_arch() error: __memcpy() 'dctx->buf' too small (16 vs u32max) It's caused because Smatch marks 'link_len' as untrusted since it comes from sscanf(). Add a check to ensure that 'link_len' is not larger than the size of the 'link_str' buffer.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00874 59th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.9.311, 4.14.276, 4.19.239 +5Red Hat: 9 advisoriesRed Hat: 19 fixed, 3 without a fix
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 | 2.6.37 and later | 4.9.311, 4.14.276, 4.19.239, 5.4.190, 5.10.112, 5.15.35, 5.17.4, 5.18 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.37 and later Fixed in 4.9.311, 4.14.276, 4.19.239, 5.4.190, 5.10.112, 5.15.35, 5.17.4, 5.18 Patch available CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 2.6.37 to before 4.9.311; 4.10 to before 4.14.276; 4.15 to before 4.19.239; 4.20 to before 5.4.190; 5.5 to before 5.10.112; 5.11 to before 5.15.35; 5.16 to before 5.17.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:* | 5.18 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.18:rc2:*:*:*:*:*:* | 5.18 rc2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.37 to before 4.9.311; 4.10 to before 4.14.276; 4.15 to before 4.19.239; 4.20 to before 5.4.190; 5.5 to before 5.10.112; 5.11 to before 5.15.35; 5.16 to before 5.17.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:* Versions 5.18 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.18:rc2:*:*:*:*:*:* Versions 5.18 rc2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.9.311, 4.14.276, 4.19.239, 5.4.190, 5.10.112, 5.15.35, 5.17.4, 5.18
Red Hat 9 advisories
- RHSA-2025:13061 Released 2025-08-05 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.104.1.el8_8, kernel-4.18.0-477.104.1.el8_8, kernel-abi-stablelists-4.18.0-477.104.1.el8_8 +14
- Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.104.1.el8_8, kernel-4.18.0-477.104.1.el8_8, kernel-abi-stablelists-4.18.0-477.104.1.el8_8 +14
- RHSA-2025:13030 Released 2025-08-05 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.141.1.el9_0, kernel-debug-devel-matched-5.14.0-70.141.1.el9_0, kernel-devel-5.14.0-70.141.1.el9_0 +5
- Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.141.1.el9_0, kernel-5.14.0-70.141.1.el9_0, kernel-abi-stablelists-5.14.0-70.141.1.el9_0 +14
- RHSA-2025:13029 Released 2025-08-05 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.141.1.rt21.213.el9_0, kernel-rt-core-5.14.0-70.141.1.rt21.213.el9_0, kernel-rt-debug-5.14.0-70.141.1.rt21.213.el9_0 +9
- Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.141.1.rt21.213.el9_0, kernel-rt-core-5.14.0-70.141.1.rt21.213.el9_0, kernel-rt-debug-5.14.0-70.141.1.rt21.213.el9_0 +7
Show 6 more Red Hat advisories
- RHSA-2025:12623 Released 2025-08-04 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.162.1.el8_2, kernel-4.18.0-193.162.1.el8_2, kernel-abi-whitelists-4.18.0-193.162.1.el8_2 +14
- RHSA-2025:12238 Released 2025-07-30 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.165.1.el8_4, kernel-4.18.0-305.165.1.el8_4, kernel-abi-stablelists-4.18.0-305.165.1.el8_4 +14
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.165.1.el8_4, kernel-4.18.0-305.165.1.el8_4, kernel-abi-stablelists-4.18.0-305.165.1.el8_4 +14
- RHSA-2025:11570 Released 2025-07-23 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.153.1.el8_6, kernel-4.18.0-372.153.1.el8_6, kernel-abi-stablelists-4.18.0-372.153.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.153.1.el8_6, kernel-4.18.0-372.153.1.el8_6, kernel-abi-stablelists-4.18.0-372.153.1.el8_6 +19
- Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.153.1.el8_6, kernel-4.18.0-372.153.1.el8_6, kernel-abi-stablelists-4.18.0-372.153.1.el8_6 +14
- RHSA-2025:11298 Released 2025-07-16 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.62.1.el8_10, kernel-4.18.0-553.62.1.el8_10, kernel-abi-stablelists-4.18.0-553.62.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.62.1.el8_10
- RHSA-2025:11299 Released 2025-07-16 · Red Hat rating Moderatekernel-rt security update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.62.1.rt7.403.el8_10, kernel-rt-core-4.18.0-553.62.1.rt7.403.el8_10, kernel-rt-debug-4.18.0-553.62.1.rt7.403.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.62.1.rt7.403.el8_10, kernel-rt-core-4.18.0-553.62.1.rt7.403.el8_10, kernel-rt-debug-4.18.0-553.62.1.rt7.403.el8_10 +7
- RHSA-2023:2458 Released 2023-05-09 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-284.11.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.11.1.el9_2, kernel-64k-devel-5.14.0-284.11.1.el9_2 +10
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.0.0-284.11.1.el9_2, kernel-5.14.0-284.11.1.el9_2, kernel-64k-5.14.0-284.11.1.el9_2 +29
- Red Hat Enterprise Linux CRB (v. 9) kernel-tools-libs-devel-5.14.0-284.11.1.el9_2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2023:2458 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2025:13030 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2025:11298 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2023:2458 |
| Red Hat Enterprise Linux BaseOS AUS (v. 8.2) | Fixed | RHSA-2025:12623 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2025:12238 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2025:11570 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2025:11570 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2025:13061 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.0) | Fixed | RHSA-2025:13030 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2025:12238 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2025:11570 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2025:13061 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2025:11298 |
| Red Hat Enterprise Linux CRB (v. 9) | Fixed | RHSA-2023:2458 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2025:11299 |
| Red Hat Enterprise Linux NFV E4S (v.9.0) | Fixed | RHSA-2025:13029 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2025:11299 |
| Red Hat Enterprise Linux Real Time E4S (v.9.0) | Fixed | RHSA-2025:13029 |
Not affected: 1 product
- Red Hat Enterprise Linux 10
Timeline
- 2026-10-02 Threatist record created from CVE-2022-49058
- 2026-10-03 Alias added: GHSA-8x6x-mcww-82p3
References
Patch 8
- https://git.kernel.org/stable/c/3e582749e742e662a8e9bb37cffac62dccaaa1e2
- https://git.kernel.org/stable/c/1316c28569a80ab3596eeab05bf5e01991e7e739
- https://git.kernel.org/stable/c/eb5f51756944735ac70cd8bb38637cc202e29c91
- https://git.kernel.org/stable/c/22d658c6c5affed10c8907e67160cef0b6c92186
- https://git.kernel.org/stable/c/4e166a41180be2f1e66bbb6d46448e80a9a5ec05
- https://git.kernel.org/stable/c/9901b07ba42b39266b34a888e48d7306fd707bee
- https://git.kernel.org/stable/c/515e7ba11ef043d6febe69389949c8ef5f25e9d0
- https://git.kernel.org/stable/c/64c4a37ac04eeb43c42d272f6e6c8c12bfcf4304
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- 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
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- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2022-49058 · CVE Program
- CVE-2022-49058 · NVD
- FIRST EPSS
- GHSA-8x6x-mcww-82p3 · GitHub Advisory Database · CC BY 4.0
- CVE-2022-49058 · 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