nfc: llcp: add missing return after LLCP_CLOSED checks

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Summary

CVECVE-2026-31629
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:42 UTC
Updated2026-06-01 17:16:53 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfc: llcp: add missing return after LLCP_CLOSED checks In nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc(), when the socket state is LLCP_CLOSED, the code correctly calls release_sock() and nfc_llcp_sock_put() but fails to return. Execution falls through to the remainder of the function, which calls release_sock() and nfc_llcp_sock_put() again. This results in a double release_sock() and a refcount underflow via double nfc_llcp_sock_put(), leading to a use-after-free. Add the missing return statements after the LLCP_CLOSED branches in both functions to prevent the fall-through.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000180000 probability, percentile 0.049010000 (date 2026-04-27)

Problem Types: CWE-667

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:A/AC:L/PR:N/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 d646960f7986fefb460a2b062d5ccc8ccfeacc3a b2a23529593d011fb433a3d711fc597ed6a6bd2f git Not specified
CNA Linux Linux affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 665315df9c3486cb213fc44d83cc8bcd47fe0d26 git Not specified
CNA Linux Linux affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6 git Not specified
CNA Linux Linux affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 0eb1263a3b8c36418c9ba295c9ab3abed664edbf git Not specified
CNA Linux Linux affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 796e0cac058252d0ad34ebe288e6f7979b5fc9b2 git Not specified
CNA Linux Linux affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 8977fad2b3c6eefd414131168d597c5d1d5e1abf git Not specified
CNA Linux Linux affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a ff3d9e8f7244293e303f7b6ef70774291c7c27e9 git Not specified
CNA Linux Linux affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a aba4712e8f0381cd5d196534ce2ad082626a5ab6 git Not specified
CNA Linux Linux affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a 2b5dd4632966c39da6ba74dbc8689b309065e82c git Not specified
CNA Linux Linux affected 3.3 Not specified
CNA Linux Linux unaffected 3.3 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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