CVE-2024-50038 (GCVE-0-2024-50038)

Vulnerability from cvelistv5 – Published: 2024-10-21 19:39 – Updated: 2025-11-03 22:24
VLAI?
Title
netfilter: xtables: avoid NFPROTO_UNSPEC where needed
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: xtables: avoid NFPROTO_UNSPEC where needed syzbot managed to call xt_cluster match via ebtables: WARNING: CPU: 0 PID: 11 at net/netfilter/xt_cluster.c:72 xt_cluster_mt+0x196/0x780 [..] ebt_do_table+0x174b/0x2a40 Module registers to NFPROTO_UNSPEC, but it assumes ipv4/ipv6 packet processing. As this is only useful to restrict locally terminating TCP/UDP traffic, register this for ipv4 and ipv6 family only. Pablo points out that this is a general issue, direct users of the set/getsockopt interface can call into targets/matches that were only intended for use with ip(6)tables. Check all UNSPEC matches and targets for similar issues: - matches and targets are fine except if they assume skb_network_header() is valid -- this is only true when called from inet layer: ip(6) stack pulls the ip/ipv6 header into linear data area. - targets that return XT_CONTINUE or other xtables verdicts must be restricted too, they are incompatbile with the ebtables traverser, e.g. EBT_CONTINUE is a completely different value than XT_CONTINUE. Most matches/targets are changed to register for NFPROTO_IPV4/IPV6, as they are provided for use by ip(6)tables. The MARK target is also used by arptables, so register for NFPROTO_ARP too. While at it, bail out if connbytes fails to enable the corresponding conntrack family. This change passes the selftests in iptables.git.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0269ea4937343536ec7e85649932bc8c9686ea78 , < 85ff9a0f793ca52c527e75cd40a69c948627ebde (git)
Affected: 0269ea4937343536ec7e85649932bc8c9686ea78 , < 8f482bb7e27b37f1f734bb9a8eeb28b23d59d189 (git)
Affected: 0269ea4937343536ec7e85649932bc8c9686ea78 , < 997f67d813ce0cf5eb3cdb8f124da68141e91b6c (git)
Affected: 0269ea4937343536ec7e85649932bc8c9686ea78 , < 4cdc55ec6222bb195995cc58f7cb46e4d8907056 (git)
Affected: 0269ea4937343536ec7e85649932bc8c9686ea78 , < 0bfcb7b71e735560077a42847f69597ec7dcc326 (git)
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    Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.57 , ≤ 6.6.* (semver)
Unaffected: 6.11.4 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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