CVE-2022-49017: tipc: re-fetch skb cb after tipc_msg_validate

First published: Mon Oct 21 2024(Updated: )

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().

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

• collector/mitre-cve
• source/MITRE
• agent/title
• agent/references
• agent/weakness
• agent/type
• agent/description
• agent/first-publish-date
• agent/author
• agent/event
• collector/nvd-api
• source/NVD
• agent/software-canonical-lookup
• agent/remedy
• agent/last-modified-date
• agent/severity
• agent/tags
• agent/softwarecombine
• vendor/linux
• canonical/linux linux kernel
• version/linux linux kernel/5.5
• version/linux linux kernel/5.11
• version/linux linux kernel/5.16
• version/linux linux kernel/6.1-rc1
• version/linux linux kernel/6.1-rc2
• version/linux linux kernel/6.1-rc3
• version/linux linux kernel/6.1-rc4
• version/linux linux kernel/6.1-rc5
• version/linux linux kernel/6.1-rc6
• version/linux linux kernel/6.1-rc7