CVE-2026-74569Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() sip_help_tcp() stores the size change of each NAT-rewritten SIP message in s16 diff and a…
▾ 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
0.4%
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp()
sip_help_tcp() stores the size change of each NAT-rewritten SIP message in s16 diff and accumulates it in s16 tdiff, but a single message can grow by more than S16_MAX while the packet stays under the 65535 enlarge_skb() limit: nf_nat_sip() rewrites every matching URI, and a long Contact list expands the message by tens of kilobytes. diff then wraps, and "datalen = datalen + diff - msglen" yields a huge unsigned datalen, so the next iteration's ct_sip_get_header() reads past the linearized skb tail.
Widen diff, tdiff and the seq_adjust hook to s32. Both are bounded by the 65535 byte packet limit, and the seqadj core is already s32 (nf_ct_seqadj_set() takes s32), so no previously accepted input is rejected.
BUG: KASAN: use-after-free in ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464) Read of size 1 at addr ffff888010800000 by task ksoftirqd/1/25 ct_sip_get_header (net/netfilter/nf_conntrack_sip.c:464) sip_help_tcp (net/netfilter/nf_conntrack_sip.c:1694) nf_confirm (net/netfilter/nf_conntrack_proto.c:183) nf_hook_slow (net/netfilter/core.c:619) ip6_output (net/ipv6/ip6_output.c:246) ip6_forward (net/ipv6/ip6_output.c:690) ipv6_rcv (net/ipv6/ip6_input.c:351) __netif_receive_skb_one_core (net/core/dev.c:6212) process_backlog (net/core/dev.c:6676) __napi_poll (net/core/dev.c:7735) net_rx_action (net/core/dev.c:7955) handle_softirqs (kernel/softirq.c:622) run_ksoftirqd (kernel/softirq.c:1076) ...
Linux >= f5b321bd37fbec9188feb1f721ab46a5ac0b35da < ed1f9be6dc8e2e280b8725e44ccdc6e0cd38640dLinux >= f5b321bd37fbec9188feb1f721ab46a5ac0b35da < 1b0843f9e9b9b0b9b4b70d143b67e58163c85b2cLinux >= f5b321bd37fbec9188feb1f721ab46a5ac0b35da < 32d4abc8923b0d4046fd63ad6e4917872e44eb6dLinux >= f5b321bd37fbec9188feb1f721ab46a5ac0b35da < 63eea41759fd682229c14e0a2205802b46d106f3Linux >= f5b321bd37fbec9188feb1f721ab46a5ac0b35da < c97621a110e386b2dd69e276eb699e1d3cec581dLinux >= f5b321bd37fbec9188feb1f721ab46a5ac0b35da < f74554e67ccf04d1fa71069e8c9afa2717e40716Linux >= f5b321bd37fbec9188feb1f721ab46a5ac0b35da < ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64Linux >= f5b321bd37fbec9188feb1f721ab46a5ac0b35da < db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5Linux 2.6.34Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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