CVE-2023-53333

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Source
https://cve.org/CVERecord?id=CVE-2023-53333
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53333.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2023-53333
Downstream
Related
Published
2025-09-16T16:12:08.427Z
Modified
2026-03-20T12:33:05.972570Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Summary
netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one
Details

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: nfconntrackdccp_packet() has an unique:

dh = skbheaderpointer(skb, dataoff, sizeof(_dh), &_dh);

And nothing more is 'pulled' from the packet, depending on the content. dh->dccphdoff, and/or dh->dccphx ...) So dccpackseq() is happily reading stuff past the _dh buffer.

BUG: KASAN: stack-out-of-bounds in nfconntrackdccp_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 skbheaderpointer() 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53333.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
2bc780499aa33311ec0f3e42624dfaa7be0ade5e
Fixed
337fdce450637ea663bc816edc2ba81e5cdad02e
Fixed
9bdcda7abaf22f6453e5b5efb7eb4e524095d5d8
Fixed
c052797ac36813419ad3bfa54cb8615db4b41f15
Fixed
5c618daa5038712c4a4ef8923905a2ea1b8836a1
Fixed
26bd1f210d3783a691052c51d76bb8a8bbd24c67
Fixed
8c0980493beed3a80d6329c44ab293dc8c032927
Fixed
ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53333.json"