CVE-2026-74569

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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) ...

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 19, 2026

Advisory Details (8)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f74554e67ccf04d1fa71069e8c9afa2717e40716
generic

netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ef5e2c6555d2bb52dfe0e4053a8c6193f9d83b64
generic

netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ed1f9be6dc8e2e280b8725e44ccdc6e0cd38640d
generic

netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/db3d0e0e5d4bc5ab4fe445b9f413d1b486508ca5
generic

netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c97621a110e386b2dd69e276eb699e1d3cec581d
generic

netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/63eea41759fd682229c14e0a2205802b46d106f3
generic

netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/32d4abc8923b0d4046fd63ad6e4917872e44eb6d
generic

netfilter: nf_conntrack_sip: widen NAT rewrite delta to s32 in sip_help_tcp() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1b0843f9e9b9b0b9b4b70d143b67e58163c85b2c

Vendor Advisories for CVE-2026-74569(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 49× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 06:27 UTCGHSA enrichment
  2. 2026-08-21 02:21 UTCEG score recompute
  3. 2026-08-21 02:21 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 22:15 UTCGHSA enrichment
  6. 2026-08-20 18:10 UTCGHSA enrichment
  7. 2026-08-20 14:04 UTCGHSA enrichment
  8. 2026-08-20 09:59 UTCGHSA enrichment
  9. 2026-08-20 05:54 UTCGHSA enrichment
  10. 2026-08-20 01:49 UTCGHSA enrichment
  11. 2026-08-19 21:43 UTCGHSA enrichment
  12. 2026-08-19 17:38 UTCEG score recompute
  13. 2026-08-19 17:38 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 16:52 UTCEG score recompute
  16. 2026-08-19 16:52 UTCGHSA enrichment
  17. 2026-08-19 16:16 UTCGHSA enrichment
  18. 2026-08-19 12:02 UTCGHSA enrichment
  19. 2026-08-19 07:56 UTCGHSA enrichment
  20. 2026-08-19 03:51 UTCGHSA enrichment
  21. 2026-08-18 23:45 UTCGHSA enrichment
  22. 2026-08-18 19:40 UTCGHSA enrichment
  23. 2026-08-18 15:35 UTCEG score recompute
  24. 2026-08-18 15:35 UTCGHSA enrichment
  25. 2026-08-18 13:49 UTCEPSS rescore
Show 24 more
  1. 2026-08-18 13:49 UTCEPSS rescore
  2. 2026-08-18 11:15 UTCGHSA enrichment
  3. 2026-08-18 07:10 UTCGHSA enrichment
  4. 2026-08-18 03:04 UTCGHSA enrichment
  5. 2026-08-17 22:58 UTCGHSA enrichment
  6. 2026-08-17 18:53 UTCGHSA enrichment
  7. 2026-08-17 14:34 UTCEG score recompute
  8. 2026-08-17 14:34 UTCGHSA enrichment
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-17 10:28 UTCEG score recompute
  11. 2026-08-17 10:28 UTCGHSA enrichment
  12. 2026-08-17 06:23 UTCEG score recompute
  13. 2026-08-17 06:23 UTCGHSA enrichment
  14. 2026-08-17 05:54 UTCEG score recompute▲ 9.80
  15. 2026-08-17 05:54 UTCGHSA enrichment
  16. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  17. 2026-08-17 05:39 UTCEG score recompute
  18. 2026-08-17 05:39 UTCGHSA enrichment
  19. 2026-08-17 05:39 UTCMITRE cvelistV5
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-15 13:27 UTCNVD update
  23. 2026-08-15 12:38 UTCEG score recompute
  24. 2026-08-15 12:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74569?
CVE-2026-74569 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconntracksip: widen NAT rewrite delta to s32 in siphelptcp() siphelptcp() 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…
When was CVE-2026-74569 disclosed?
CVE-2026-74569 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74569 actively exploited?
CVE-2026-74569 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 67.8% of all scored CVEs.
What is the CVSS score of CVE-2026-74569?
CVE-2026-74569 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74569?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74569, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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