CVE-2021-47068 (GCVE-0-2021-47068)

Vulnerability from cvelistv5 – Published: 2024-02-29 22:37 – Updated: 2026-05-23 15:19
VLAI?
Title
net/nfc: fix use-after-free llcp_sock_bind/connect
Summary
In the Linux kernel, the following vulnerability has been resolved: net/nfc: fix use-after-free llcp_sock_bind/connect Commits 8a4cd82d ("nfc: fix refcount leak in llcp_sock_connect()") and c33b1cc62 ("nfc: fix refcount leak in llcp_sock_bind()") fixed a refcount leak bug in bind/connect but introduced a use-after-free if the same local is assigned to 2 different sockets. This can be triggered by the following simple program: int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP ); memset( &addr, 0, sizeof(struct sockaddr_nfc_llcp) ); addr.sa_family = AF_NFC; addr.nfc_protocol = NFC_PROTO_NFC_DEP; bind( sock1, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) ) bind( sock2, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) ) close(sock1); close(sock2); Fix this by assigning NULL to llcp_sock->local after calling nfc_llcp_local_put. This addresses CVE-2021-23134.
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: a1cdd18c49d23ec38097ac2c5b0d761146fc0109 , < 26157c82ba756767b2bd66d28a71b1bc454447f6 (git)
Affected: 18013007b596771bf5f5e7feee9586fb0386ad14 , < ccddad6dd28530e716448e594c9ca7c76ccd0570 (git)
Affected: 538a6ff11516d38a61e237d2d2dc04c30c845fbe , < 18ae4a192a4496e48a5490b52812645d2413307c (git)
Affected: adbb1d218c5f56dbae052765da83c0f57fce2a31 , < 48fba458fe54cc2a980a05c13e6c19b8b2cfb610 (git)
Affected: c89903c9eff219a4695e63715cf922748d743f65 , < e32352070bcac22be6ed8ab635debc280bb65b8c (git)
Affected: 6fb003e5ae18d8cda4c8a1175d9dd8db12bec049 , < 6b7021ed36dabf29e56842e3408781cd3b82ef6e (git)
Affected: 8c9e4971e142e2899606a2490b77a1208c1f4638 , < 374cdde4dcc9c909a60713abdbbf96d5e3e09f91 (git)
Affected: c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d , < 18175fe17ae043a0b81e5d511f8817825784c299 (git)
Affected: c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d , < c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6 (git)
Affected: 4.4.267 , < 4.4.269 (semver)
Affected: 4.9.267 , < 4.9.269 (semver)
Affected: 4.14.231 , < 4.14.233 (semver)
Affected: 4.19.187 , < 4.19.191 (semver)
Affected: 5.4.112 , < 5.4.119 (semver)
Affected: 5.10.30 , < 5.10.37 (semver)
Affected: 5.11.14 , < 5.11.21 (semver)
Create a notification for this product.
    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 4.4.269 , ≤ 4.4.* (semver)
Unaffected: 4.9.269 , ≤ 4.9.* (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.119 , ≤ 5.4.* (semver)
Unaffected: 5.10.37 , ≤ 5.10.* (semver)
Unaffected: 5.11.21 , ≤ 5.11.* (semver)
Unaffected: 5.12.4 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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