netfilter: nft_objref: validate objref and objrefmap expressions
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.184, 6.6.113, 6.12.54, 6.17.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_objref: validate objref and objrefmap expressions Referencing a synproxy stateful object from OUTPUT hook causes kernel crash due to infinite recursive calls: BUG: TASK stack guard page was hit at 000000008bda5b8c (stack is 000000003ab1c4a5..00000000494d8b12) [...] Call Trace: __find_rr_leaf+0x99/0x230 fib6_table_lookup+0x13b/0x2d0 ip6_pol_route+0xa4/0x400 fib6_rule_lookup+0x156/0x240 ip6_route_output_flags+0xc6/0x150 __nf_ip6_route+0x23/0x50 synproxy_send_tcp_ipv6+0x106/0x200 synproxy_send_client_synack_ipv6+0x1aa/0x1f0 nft_synproxy_do_eval+0x263/0x310 nft_do_chain+0x5a8/0x5f0 [nf_tables nft_do_chain_inet+0x98/0x110 nf_hook_slow+0x43/0xc0 __ip6_local_out+0xf0/0x170 ip6_local_out+0x17/0x70 synproxy_send_tcp_ipv6+0x1a2/0x200 synproxy_send_client_synack_ipv6+0x1aa/0x1f0 [...] Implement objref and objrefmap expression validate functions. Currently, only NFT_OBJECT_SYNPROXY object type requires validation. This will also handle a jump to a chain using a synproxy object from the OUTPUT hook. Now when trying to reference a synproxy object in the OUTPUT hook, nft will produce the following error: synproxy_crash.nft: Error: Could not process rule: Operation not supported synproxy name mysynproxy ^^^^^^^^^^^^^^^^^^^^^^^^
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From ee394f96ad7517fbc0de9106dcc7ce9efb14f264 · fixed in f31bcea12222a26d6f151df9c4a6d21f2eec1724; From ee394f96ad7517fbc0de9106dcc7ce9efb14f264 · fixed in 0028e0134c64d9ed21728341a74fcfc59cd0f944; From ee394f96ad7517fbc0de9106dcc7ce9efb14f264 · fixed in 7ea55a44493a5a36c3b3293b88bbe4841f9dbaf0; From ee394f96ad7517fbc0de9106dcc7ce9efb14f264 · fixed in 4c1cf72ec10be5a9ad264650cadffa1fbce6fabd; From ee394f96ad7517fbc0de9106dcc7ce9efb14f264 · fixed in f359b809d54c6e3dd1d039b97e0b68390b0e53e4
- Linux Linux
5.4
- KernelLinux
From 5.4.0 · fixed in 6.1.184; From 6.2.0 · fixed in 6.6.113; From 6.7.0 · fixed in 6.12.54; From 6.13.0 · fixed in 6.17.4