CVE-2026-72251Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: reload possible stale data pointer quoting sashiko: ------------------------------------------------------------------------ [..] noticed a po…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.7%
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_nat_sip: reload possible stale data pointer
[..] noticed a potential memory bug and header corruption involving the SIP NAT helper.
In net/netfilter/nf_nat_sip.c:nf_nat_sip(): if (skb_ensure_writable(skb, skb->len)) { nf_ct_helper_log(skb, ct, "cannot mangle packet"); return NF_DROP; } uh = (void *)skb->data + protoff; uh->dest = ct_sip_info->forced_dport; if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo, protoff, 0, 0, NULL, 0)) {
If a cloned or fragmented SKB is reallocated by skb_ensure_writable(), the old data buffer is freed. However, nf_nat_sip() fails to update *dptr to point to the new buffer.
nf_conntrack_sip linerizes skbs, hence no fragmented skb can be seen. But clones are possible, so rebuild dptr.
Disable nf_nat_mangle_udp_packet() branch for TCP streams. It doesn't look like this can ever happen, else we should have received bug reports about this, so just check the conntrack is UDP and drop otherwise.
The calling conntrack_sip set ->forced_dport for SIP_HDR_VIA_UDP messages, so I don't think this is ever expected to be true for a TCP stream.
Linux >= 7266507d89991fa1e989283e4e032c6d9357fe26 < bded21a4bf9bf86a79148be735723a97ca9a7532Linux >= 7266507d89991fa1e989283e4e032c6d9357fe26 < dc11f26685aa850f237226f0f463647aea58ab7cLinux >= 7266507d89991fa1e989283e4e032c6d9357fe26 < e38143c9b477f2968024c47c647dd4456a40aff1Linux >= 7266507d89991fa1e989283e4e032c6d9357fe26 < 57e4e29644ec054d7021d296407e7ddd844afea2Linux >= 7266507d89991fa1e989283e4e032c6d9357fe26 < eae9c6ccb5af69c713a65f8ae219f5c1aa32cd17Linux >= 7266507d89991fa1e989283e4e032c6d9357fe26 < 2bcf2c5052fb5e73e255140ab43f056aef409c27Linux >= 7266507d89991fa1e989283e4e032c6d9357fe26 < 0e76e3e886cc9ee027337d5ad39cb96f57b7bdc7Linux >= 7266507d89991fa1e989283e4e032c6d9357fe26 < 77e43bcb7ec177e293a5c3f1b91a2c5aebfb6c68Linux 3.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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