rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

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Summary

CVECVE-2026-43500
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-11 08:16:16 UTC
Updated2026-05-17 16:16:16 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000100000 probability, percentile 0.011430000 (date 2026-05-12)

Problem Types: CWE-787 | CWE-787 CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1ADPDECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 7c504ffab3efce8f7e4f463b314ae31030bdf18b git Not specified
CNA Linux Linux affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 3711382a77342a9a1c3d2e7330dcfc7ea927f568 git Not specified
CNA Linux Linux affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 3eae0f4f9f7206a4801efa5e0235c25bbd5a412c git Not specified
CNA Linux Linux affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 d45179f8795222ce858770dc619abe51f9d24411 git Not specified
CNA Linux Linux affected d0d5c0cd1e711c98703f3544c1e6fc1372898de5 aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.88 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.29 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.6 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
github.com/V4bel/dirtyfrag 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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