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CVE-2022-48757 is an information-disclosure flaw in the Linux kernel networking subsystem affecting the packet-type procfs display. A packet socket created without binding it to a network device registers a packet_type entry. Before the fix, ptype_seq_show exposed such entries through /proc/net/ptype without verifying that the entry belonged to the network namespace of the reader. Consequently, a packet_type created in one network namespace could be observed from another network namespace, contrary to packet sockets' namespace-aware isolation. The fix records the associated network namespace in packet_type objects for packet sockets and filters entries in ptype_seq_show accordingly.
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Linux kernel information-disclosure flaw through /proc/net/ptype.
A low-severity Linux kernel information-disclosure vulnerability involving leakage of information through /proc/net/ptype.
A local Linux kernel network-namespace isolation flaw in /proc/net/ptype. An unbound packet socket's packet_type can be exposed across network namespaces, resulting in information disclosure. Red Hat rates its impact Low (CVSS 3.3), while NVD lists CVSS 7.1.
A Linux kernel information-disclosure vulnerability in the packet-socket and procfs handling of `/proc/net/ptype`. An unbound packet socket created in one network namespace could expose its packet_type information to users reading that file from other network namespaces.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.