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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2021-47068

net/nfc: fix use-after-free llcp_sock_bind/connect

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • a1cdd18c49d23ec38097ac2c5b0d761146fc0109 to < 26157c82ba756767b2bd66d28a71b1bc454447f6affected
  • 18013007b596771bf5f5e7feee9586fb0386ad14 to < ccddad6dd28530e716448e594c9ca7c76ccd0570affected
  • 538a6ff11516d38a61e237d2d2dc04c30c845fbe to < 18ae4a192a4496e48a5490b52812645d2413307caffected
  • adbb1d218c5f56dbae052765da83c0f57fce2a31 to < 48fba458fe54cc2a980a05c13e6c19b8b2cfb610affected
  • c89903c9eff219a4695e63715cf922748d743f65 to < e32352070bcac22be6ed8ab635debc280bb65b8caffected
  • 6fb003e5ae18d8cda4c8a1175d9dd8db12bec049 to < 6b7021ed36dabf29e56842e3408781cd3b82ef6eaffected
  • 8c9e4971e142e2899606a2490b77a1208c1f4638 to < 374cdde4dcc9c909a60713abdbbf96d5e3e09f91affected
  • c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d to < 18175fe17ae043a0b81e5d511f8817825784c299affected
  • c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d to < c61760e6940dd4039a7f5e84a6afc9cdbf4d82b6affected
  • 4.4.267 to < 4.4.269affected
  • 4.9.267 to < 4.9.269affected
  • 4.14.231 to < 4.14.233affected
  • 4.19.187 to < 4.19.191affected
  • 5.4.112 to < 5.4.119affected
  • 5.10.30 to < 5.10.37affected
  • 5.11.14 to < 5.11.21affected

Linux Linux

Default version status: affected

  • 5.12affected
  • 0 to < 5.12unaffected
  • 4.4.269 to ≤ 4.4.*unaffected
  • 4.9.269 to ≤ 4.9.*unaffected
  • 4.14.233 to ≤ 4.14.*unaffected
  • 4.19.191 to ≤ 4.19.*unaffected
  • 5.4.119 to ≤ 5.4.*unaffected
  • 5.10.37 to ≤ 5.10.*unaffected
  • 5.11.21 to ≤ 5.11.*unaffected
  • 5.12.4 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References