NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL
Priority MEDIUM 40CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 16 fixed, 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL OPDESC() simply indexes into nfsd4_ops[] by the op's operation number, without range checking that value. It assumes callers are careful to avoid calling it with an out-of-bounds opnum value. nfsd4_decode_compound() is not so careful, and can invoke OPDESC() with opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end of nfsd4_ops[].
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00305 23rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.220, 5.15.107, 6.1.24 +2Red Hat: 8 advisoriesRed Hat: 16 fixed, 3 without a fix
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.14 and later | 5.10.220, 5.15.107, 6.1.24, 6.2.11, 6.3 | Patch available | CNA |
- Linux VendorLinux Affected 4.14 and later Fixed in 5.10.220, 5.15.107, 6.1.24, 6.2.11, 6.3 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.14 to before 5.10.220; 5.11 to before 5.15.107; 5.16 to before 6.1.24; 6.2 to before 6.2.11 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc1:*:*:*:*:*:* | 6.3 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc2:*:*:*:*:*:* | 6.3 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc3:*:*:*:*:*:* | 6.3 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc4:*:*:*:*:*:* | 6.3 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.3:rc5:*:*:*:*:*:* | 6.3 rc5 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.14 to before 5.10.220; 5.11 to before 5.15.107; 5.16 to before 6.1.24; 6.2 to before 6.2.11 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc1:*:*:*:*:*:* Versions 6.3 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc2:*:*:*:*:*:* Versions 6.3 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc3:*:*:*:*:*:* Versions 6.3 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc4:*:*:*:*:*:* Versions 6.3 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.3:rc5:*:*:*:*:*:* Versions 6.3 rc5 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.220, 5.15.107, 6.1.24, 6.2.11, 6.3
Red Hat 8 advisories
- RHSA-2026:0576 Released 2026-01-14 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.161.1.el9_0, kernel-debug-devel-matched-5.14.0-70.161.1.el9_0, kernel-devel-5.14.0-70.161.1.el9_0 +5
- Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.161.1.el9_0, kernel-5.14.0-70.161.1.el9_0, kernel-abi-stablelists-5.14.0-70.161.1.el9_0 +14
- RHSA-2026:0535 Released 2026-01-14 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.152.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.152.1.el9_2, kernel-64k-devel-5.14.0-284.152.1.el9_2 +10
- Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.152.1.el9_2, kernel-5.14.0-284.152.1.el9_2, kernel-64k-5.14.0-284.152.1.el9_2 +29
- RHSA-2026:0536 Released 2026-01-14 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.175.1.el8_6, kernel-4.18.0-372.175.1.el8_6, kernel-abi-stablelists-4.18.0-372.175.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.175.1.el8_6, kernel-4.18.0-372.175.1.el8_6, kernel-abi-stablelists-4.18.0-372.175.1.el8_6 +19
- Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.175.1.el8_6, kernel-4.18.0-372.175.1.el8_6, kernel-abi-stablelists-4.18.0-372.175.1.el8_6 +14
Show 5 more Red Hat advisories
- RHSA-2026:0532 Released 2026-01-14 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.124.1.el8_8, kernel-4.18.0-477.124.1.el8_8, kernel-abi-stablelists-4.18.0-477.124.1.el8_8 +14
- Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.124.1.el8_8, kernel-4.18.0-477.124.1.el8_8, kernel-abi-stablelists-4.18.0-477.124.1.el8_8 +14
- RHSA-2026:0533 Released 2026-01-14 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.183.1.el8_4, kernel-4.18.0-305.183.1.el8_4, kernel-abi-stablelists-4.18.0-305.183.1.el8_4 +14
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.183.1.el8_4, kernel-4.18.0-305.183.1.el8_4, kernel-abi-stablelists-4.18.0-305.183.1.el8_4 +14
- RHSA-2026:0534 Released 2026-01-14 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-core-5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-5.14.0-284.152.1.rt14.437.el9_2 +9
- Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-core-5.14.0-284.152.1.rt14.437.el9_2, kernel-rt-debug-5.14.0-284.152.1.rt14.437.el9_2 +11
- RHSA-2026:0537 Released 2026-01-14 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-core-5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-debug-5.14.0-70.161.1.rt21.233.el9_0 +9
- Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-core-5.14.0-70.161.1.rt21.233.el9_0, kernel-rt-debug-5.14.0-70.161.1.rt21.233.el9_0 +7
- RHSA-2025:23445 Released 2025-12-17 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.178.1.el8_2, kernel-4.18.0-193.178.1.el8_2, kernel-abi-whitelists-4.18.0-193.178.1.el8_2 +14
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 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2026:0576 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:0535 |
| Red Hat Enterprise Linux BaseOS AUS (v. 8.2) | Fixed | RHSA-2025:23445 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2026:0533 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2026:0536 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2026:0536 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2026:0532 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.0) | Fixed | RHSA-2026:0576 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2026:0535 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:0533 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2026:0536 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2026:0532 |
| Red Hat Enterprise Linux NFV E4S (v.9.0) | Fixed | RHSA-2026:0537 |
| Red Hat Enterprise Linux Real Time E4S (v.9.0) | Fixed | RHSA-2026:0537 |
| Red Hat Enterprise Linux Real Time E4S (v.9.2) | Fixed | RHSA-2026:0534 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) | Fixed | RHSA-2026:0534 |
Not affected: 4 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux AppStream E4S (v.9.2)
- Red Hat Enterprise Linux BaseOS E4S (v.9.2)
Timeline
- 2026-10-02 Threatist record created from CVE-2023-53680
- 2026-10-03 Alias added: GHSA-6qhx-j6v2-cx4m
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → MEDIUM
References
Patch 5
- https://git.kernel.org/stable/c/50827896c365e0f6c8b55ed56d444dafd87c92c5
- https://git.kernel.org/stable/c/a64160124d5a078be0c380b1e8a0bad2d040d3a1
- https://git.kernel.org/stable/c/ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e
- https://git.kernel.org/stable/c/f352c41fa718482979e7e6b71b4da2b718e381cc
- https://git.kernel.org/stable/c/804d8e0a6e54427268790472781e03bc243f4ee3
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Sources
- CVE-2023-53680 · CVE Program
- CVE-2023-53680 · NVD
- FIRST EPSS
- GHSA-6qhx-j6v2-cx4m · GitHub Advisory Database · CC BY 4.0
- CVE-2023-53680 · 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