rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present
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
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec(). Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.
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 | 5.3 and later | 6.6.140, 6.12.88, 6.18.29, 7.0.6, 7.1 | Patch available | CNA |
- Linux VendorLinux Affected 5.3 and later Fixed in 6.6.140, 6.12.88, 6.18.29, 7.0.6, 7.1 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | after 5.3, before 6.18.29; 6.19 to before 7.0.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.3:-:*:*:*:*:*:* | 5.3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.3:rc7:*:*:*:*:*:* | 5.3 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.3:rc8:*:*:*:*:*:* | 5.3 rc8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | 7.1 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | 7.1 rc2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions after 5.3, before 6.18.29; 6.19 to before 7.0.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.3:-:*:*:*:*:*:* Versions 5.3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.3:rc7:*:*:*:*:*:* Versions 5.3 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.3:rc8:*:*:*:*:*:* Versions 5.3 rc8 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, 6.12.88, 6.18.29, 7.0.6, 7.1
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 6 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-43500
- 2026-10-03 Alias added: GHSA-8p2w-g92w-f4x3
- 2026-10-25 EPSS moved to the 99th percentile and above
- 2026-10-25 Priority changed: MEDIUM → HIGH
References
Patch 3
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-2026-43500 · CVE Program
- CVE-2026-43500 · NVD
- FIRST EPSS
- GHSA-8p2w-g92w-f4x3 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-43500 · Red Hat security data · CC BY 4.0
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