CVE DATABASE / CVE-2026-43284
CVE-2026-43284
Summary
In the Linux kernel, the following vulnerability has been resolved:xfrm: esp: avoid in-place decrypt on shared skb fragsMSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs.That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb.Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place. Private nonlinear skb frags still use the existing fast path.This intentionally does not change ESP output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len is nonzero, while ESP tailen is positive. Thus ESP output will either use the separate destination-frag path or fall back to skb_cow_data().
CVSS 3.1 breakdown
| Base score | 8.8 (HIGH) |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| Attack vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | CHANGED |
| 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/50ed1e7873100f77abad20fd31c51029bc49cd03
- https://git.kernel.org/stable/c/52646cbd00e765a6db9c3afe9535f26218276034
- https://git.kernel.org/stable/c/5d55c7336f8032d434adcc5fab987ccc93a44aec
- https://git.kernel.org/stable/c/71a1d9d985d26716f74d21f18ee8cac821b06e97
- https://git.kernel.org/stable/c/8253aab4659ca16116b522203c2a6b18dccacea7
- https://git.kernel.org/stable/c/a6cb440f274a22456ef3e86b457344f1678f38f9
- https://git.kernel.org/stable/c/ab8b995323e5237041472d07e5055f5f7dcdf15b
- https://git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d
- https://git.kernel.org/stable/c/f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4
- https://git.kernel.org/stable/c/fe785bb3a8096dffcc4048a85cd0c83337eeecad
- http://www.openwall.com/lists/oss-security/2026/05/08/7
- http://www.openwall.com/lists/oss-security/2026/05/13/6
- http://www.openwall.com/lists/oss-security/2026/05/14/2
- http://www.openwall.com/lists/oss-security/2026/05/14/4
- https://github.com/V4bel/dirtyfrag
Data: NIST NVD. NVD last modified 2026-05-14. Always verify against the vendor advisory before acting.