CVE-2026-43500rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-787, CWE-123
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Sep 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before 7c504ffab3efce8f7e4f463b314ae31030bdf18b; from d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before 3711382a77342a9a1c3d2e7330dcfc7ea927f568; from d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before 3eae0f4f9f7206a4801efa5e0235c25bbd5a412c; from d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before d45179f8795222ce858770dc619abe51f9d24411; from d0d5c0cd1e711c98703f3544c1e6fc1372898de5 before aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | 10 | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift | 4 | CISA ADP |
linux linux_kernel linux:linux_kernel | after 5.3 before 6.18.29; from 6.19 before 7.0.6; 5.3; 5.3; 5.3; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b
- https://git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568
- https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412cpatch
- https://git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411patch
- https://git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71patch
- https://access.redhat.com/security/cve/CVE-2026-43500
- https://bugzilla.redhat.com/show_bug.cgi?id=2468273
- https://github.com/V4bel/dirtyfrag
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43500.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.