CVE-2026-43500 (GCVE-0-2026-43500)

Vulnerability from cvelistv5 – Published: 2026-05-11 06:26 – Updated: 2026-05-14 14:30
VLAI?
Title
rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present
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.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < 3711382a77342a9a1c3d2e7330dcfc7ea927f568 (git)
Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < 3eae0f4f9f7206a4801efa5e0235c25bbd5a412c (git)
Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < d45179f8795222ce858770dc619abe51f9d24411 (git)
Affected: d0d5c0cd1e711c98703f3544c1e6fc1372898de5 , < aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.29 , ≤ 6.18.* (semver)
Unaffected: 7.0.6 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc3 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.