# CVE-2021-47068: linux: In the Linux kernel, the following vulnerability has been resolved:  net/nfc: fix use-after-free llcp_sock_bind/conne...

CVE-2021-47068 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47068, released February 29, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47068
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 29, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47068](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47068.md) | Feb 29, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47068](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47068.md) | Feb 29, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47068](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47068.md) | Feb 29, 2024 |

---

Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.