CVE-2023-53333 (GCVE-0-2023-53333)
Vulnerability from cvelistv5
Published
2025-09-16 16:12
Modified
2026-08-05 09:13
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one Eric Dumazet says: nf_conntrack_dccp_packet() has an unique: dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); And nothing more is 'pulled' from the packet, depending on the content. dh->dccph_doff, and/or dh->dccph_x ...) So dccp_ack_seq() is happily reading stuff past the _dh buffer. BUG: KASAN: stack-out-of-bounds in nf_conntrack_dccp_packet+0x1134/0x11c0 Read of size 4 at addr ffff000128f66e0c by task syz-executor.2/29371 [..] Fix this by increasing the stack buffer to also include room for the extra sequence numbers and all the known dccp packet type headers, then pull again after the initial validation of the basic header. While at it, mark packets invalid that lack 48bit sequence bit but where RFC says the type MUST use them. Compile tested only. v2: first skb_header_pointer() now needs to adjust the size to only pull the generic header. (Eric) Heads-up: I intend to remove dccp conntrack support later this year.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2bc780499aa33311ec0f3e42624dfaa7be0ade5e
Version: 2bc780499aa33311ec0f3e42624dfaa7be0ade5e
Version: 2bc780499aa33311ec0f3e42624dfaa7be0ade5e
Version: 2bc780499aa33311ec0f3e42624dfaa7be0ade5e
Version: 2bc780499aa33311ec0f3e42624dfaa7be0ade5e
Version: 2bc780499aa33311ec0f3e42624dfaa7be0ade5e
Version: 2bc780499aa33311ec0f3e42624dfaa7be0ade5e
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}


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