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CVE-2026-100070— netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： netfilter: nf_nat_sip：当 NAT 缩减数据包长度时，回退偏移量 sashiko 指出： 如果 改变了数据包的长度（例如，当公共 NAT IP 字符串比内部 IP 更短或更长时）， 仍将指向相对于未修改（pre-mangled）数据包的偏移位置。 如果数据包被缩减， 可能会超出正确位置，从而导致下一次调用 时静默跳过字节，并遗漏后续的 Contact 头。这是否可能导致这些后续头未能进行 NAT 转换，从而泄露内部网络细节？

AI Predicted 5.3 Difficulty: Moderate EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c978cd3a937141deaf7995b849824af6dacdeae7< 6828aca3d82717c2fda92af81c0dda642bc2b465 affected
c978cd3a937141deaf7995b849824af6dacdeae7< 2703f5ea8d85bc729f433ac09ee902084c947122 affected
c978cd3a937141deaf7995b849824af6dacdeae7< 0f4d30e2e49f343fc28ba1e259fd22969b940c46 affected
c978cd3a937141deaf7995b849824af6dacdeae7< 810da5a63549531da78348b0a4545042d84e01e2 affected
c978cd3a937141deaf7995b849824af6dacdeae7< 668cc1c30caedc63070b10d17d5514748988a140 affected
c978cd3a937141deaf7995b849824af6dacdeae7< e70d48fcf8382581162608a4a322919bfd22aef3 affected
c978cd3a937141deaf7995b849824af6dacdeae7< c408d416618ebb8a95e3097a13f3b793ea9272ee affected
c978cd3a937141deaf7995b849824af6dacdeae7< 16aecbe3036f6097c26b51b12e4c1cf207769690 affected
… +10 more rows
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I. Basic Information for CVE-2026-100070

Vulnerability Information
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Vulnerability Title
netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet sashiko says: If map_addr() changes the packet length, such as when the public NAT IP string is shorter or longer than the internal IP, coff will still point to the offset relative to the pre-mangled packet. If the packet shrinks, coff could overshoot the correct position, potentially causing the next ct_sip_parse_header_uri() call to silently skip bytes and miss subsequent Contact headers. Could this lead to a failure to NAT those subsequent headers and leak internal network details?
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c978cd3a937141deaf7995b849824af6dacdeae7 ~ 6828aca3d82717c2fda92af81c0dda642bc2b465 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2026-100070

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III. Intelligence Information for CVE-2026-100070

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Patches & Fixes for CVE-2026-100070 (8)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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