nfc: pn533: allocate rx skb before consuming bytes

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Summary

CVECVE-2026-31660
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:45 UTC
Updated2026-04-27 20:17:30 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfc: pn533: allocate rx skb before consuming bytes pn532_receive_buf() reports the number of accepted bytes to the serdev core. The current code consumes bytes into recv_skb and may already hand a complete frame to pn533_recv_frame() before allocating a fresh receive buffer. If that alloc_skb() fails, the callback returns 0 even though it has already consumed bytes, and it leaves recv_skb as NULL for the next receive callback. That breaks the receive_buf() accounting contract and can also lead to a NULL dereference on the next skb_put_u8(). Allocate the receive skb lazily before consuming the next byte instead. If allocation fails, return the number of bytes already accepted.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

Problem Types: NVD-CWE-Other

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 c656aa4c27b17a8c70da223ed5ab42145800d6b5 2ca64fb7e2d2ae14619dd204d4f2f0a601f421fb git Not specified
CNA Linux Linux affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 8b71299d587d9e4c830c18afb884c80ddb30ad28 git Not specified
CNA Linux Linux affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 16649adc2e19509104245ea1f349b629d858f11f git Not specified
CNA Linux Linux affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 07cb6c72e66ba548679f22ac29ad588da8999279 git Not specified
CNA Linux Linux affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 a9495069b43b8634c1ae0042e888766c34f66637 git Not specified
CNA Linux Linux affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 21ae2cda66a55c759607bbf1d23cbaa42019d2de git Not specified
CNA Linux Linux affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 7e37da42eda45d7859d9273fc7e225d8df458038 git Not specified
CNA Linux Linux affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 c71ba669b570c7b3f86ec875be222ea11dacb352 git Not specified
CNA Linux Linux affected 5.5 Not specified
CNA Linux Linux unaffected 5.5 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.135 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/21ae2cda66a55c759607bbf1d23cbaa42019d2de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7e37da42eda45d7859d9273fc7e225d8df458038 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/16649adc2e19509104245ea1f349b629d858f11f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8b71299d587d9e4c830c18afb884c80ddb30ad28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/07cb6c72e66ba548679f22ac29ad588da8999279 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a9495069b43b8634c1ae0042e888766c34f66637 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c71ba669b570c7b3f86ec875be222ea11dacb352 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2ca64fb7e2d2ae14619dd204d4f2f0a601f421fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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