# CVE-2022-49017: linux: In the Linux kernel, the following vulnerability has been resolved:  tipc: re-fetch skb cb after tipc_msg_validate  A...

CVE-2022-49017 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49017, released October 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49017
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0064
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  tipc: re-fetch skb cb after tipc_msg_validate  As the call trace shows, the original skb was freed in tipc_msg_validate(), and dereferencing the old skb cb would cause an use-after-free crash.    BUG: KASAN: use-after-free in tipc_crypto_rcv_complete+0x1835/0x2240 [tipc]   Call Trace:    <IRQ>    tipc_crypto_rcv_complete+0x1835/0x2240 [tipc]    tipc_crypto_rcv+0xd32/0x1ec0 [tipc]    tipc_rcv+0x744/0x1150 [tipc]   ...   Allocated by task 47078:    kmem_cache_alloc_node+0x158/0x4d0    __alloc_skb+0x1c1/0x270    tipc_buf_acquire+0x1e/0xe0 [tipc]    tipc_msg_create+0x33/0x1c0 [tipc]    tipc_link_build_proto_msg+0x38a/0x2100 [tipc]    tipc_link_timeout+0x8b8/0xef0 [tipc]    tipc_node_timeout+0x2a1/0x960 [tipc]    call_timer_fn+0x2d/0x1c0   ...   Freed by task 47078:    tipc_msg_validate+0x7b/0x440 [tipc]    tipc_crypto_rcv_complete+0x4b5/0x2240 [tipc]    tipc_crypto_rcv+0xd32/0x1ec0 [tipc]    tipc_rcv+0x744/0x1150 [tipc]  This patch fixes it by re-fetching the skb cb from the new allocated skb after calling tipc_msg_validate().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.12-1 | [DEBIAN-CVE-2022-49017](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49017.md) | Oct 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.0.12-1 | [DEBIAN-CVE-2022-49017](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49017.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.0.12-1 | [DEBIAN-CVE-2022-49017](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49017.md) | Oct 21, 2024 |

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