Bug 2355437 (CVE-2023-53033)

Summary: CVE-2023-53033 kernel: netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-03-27 17:01:31 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits

If the offset + length goes over the ethernet + vlan header, then the
length is adjusted to copy the bytes that are within the boundaries of
the vlan_ethhdr scratchpad area. The remaining bytes beyond ethernet +
vlan header are copied directly from the skbuff data area.

Fix incorrect arithmetic operator: subtract, not add, the size of the
vlan header in case of double-tagged packets to adjust the length
accordingly to address CVE-2023-0179.
Comment 1 Robb Gatica 2025-03-28 01:44:07 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032721-CVE-2023-53033-9089@gregkh/T
Comment 4 Avinash Hanwate 2025-03-28 05:55:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032721-CVE-2023-53033-9089@gregkh/T