phonet/pep: refuse to enable an unbound pipe
Priority LOW 24Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
In the Linux kernel, the following vulnerability has been resolved: phonet/pep: refuse to enable an unbound pipe This ioctl() implicitly assumed that the socket was already bound to a valid local socket name, i.e. Phonet object. If the socket was not bound, two separate problems would occur: 1) We'd send an pipe enablement request with an invalid source object. 2) Later socket calls could BUG on the socket unexpectedly being connected yet not bound to a valid object.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00226 13th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 4.4.297, 4.9.295, 4.14.260 +5
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 | 3.3 and later | 4.4.297, 4.9.295, 4.14.260, 4.19.223, 5.4.169, 5.10.89, 5.15.12, 5.16 | Patch available | CNA |
- Linux VendorLinux Affected 3.3 and later Fixed in 4.4.297, 4.9.295, 4.14.260, 4.19.223, 5.4.169, 5.10.89, 5.15.12, 5.16 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 4.4.297; 4.5 to before 4.9.295; 4.10 to before 4.14.260; 4.15 to before 4.19.223; 4.20 to before 5.4.169; 5.5 to before 5.10.89; 5.11 to before 5.15.12 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:* | 5.16 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:* | 5.16 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:* | 5.16 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:* | 5.16 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:* | 5.16 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:* | 5.16 rc6 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 4.4.297; 4.5 to before 4.9.295; 4.10 to before 4.14.260; 4.15 to before 4.19.223; 4.20 to before 5.4.169; 5.5 to before 5.10.89; 5.11 to before 5.15.12 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:* Versions 5.16 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:* Versions 5.16 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:* Versions 5.16 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:* Versions 5.16 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:* Versions 5.16 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:* Versions 5.16 rc6 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.4.297, 4.9.295, 4.14.260, 4.19.223, 5.4.169, 5.10.89, 5.15.12, 5.16
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
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
- 2026-10-02 Threatist record created from CVE-2021-47086
- 2026-10-03 Alias added: GHSA-3hhr-965v-pj8r
References
Patch 8
- https://git.kernel.org/stable/c/0bbdd62ce9d44f3a22059b3d20a0df977d9f6d59
- https://git.kernel.org/stable/c/b10c7d745615a092a50c2e03ce70446d2bec2aca
- https://git.kernel.org/stable/c/311601f114859d586d5ef8833d60d3aa23282161
- https://git.kernel.org/stable/c/982b6ba1ce626ef87e5c29f26f2401897554f235
- https://git.kernel.org/stable/c/48c76fc53582e7f13c1e0b11c916e503256c4d0b
- https://git.kernel.org/stable/c/52ad5da8e316fa11e3a50b3f089aa63e4089bf52
- https://git.kernel.org/stable/c/53ccdc73eedaf0e922c45b569b797d2796fbaafa
- https://git.kernel.org/stable/c/75a2f31520095600f650597c0ac41f48b5ba0068
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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-2021-47086 · CVE Program
- CVE-2021-47086 · NVD
- FIRST EPSS
- GHSA-3hhr-965v-pj8r · GitHub Advisory Database · CC BY 4.0
- CVE-2021-47086 · Red Hat security data · CC BY 4.0
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