CVE DATABASE / CVE-2026-43500
CVE-2026-43500
Summary
In the Linux kernel, the following vulnerability has been resolved:rxrpc: Also unshare DATA/RESPONSE packets when paged frags are presentThe 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.
CVSS 3.1 breakdown
| Base score | 7.8 (HIGH) |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
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Our coverage
- MiniPlasma Zero-Day: Unpatched CVE-2020-17103 Still Grants SYSTEM on Windows 11
- Dirty Frag: Public Root Exploit Hits All Major Linux Distros, Partial Patch Only
- Dirty Frag: CVE-2026-43284 and CVE-2026-43500 Grant Root Access Across All Major Linux Distros
- Metasploit Adds ARMLE Support to CVE-2026-31431 Copy Fail Linux Root Exploit
- DarkSword iOS Exploit Chain: Six CVEs, Three Zero-Days, Full Device Takeover
References
- https://git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568
- https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c
- https://git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b
- https://git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71
- https://git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411
- https://github.com/V4bel/dirtyfrag
Data: NIST NVD. NVD last modified 2026-05-17. Always verify against the vendor advisory before acting.