9.8

CVE-2026-74597: linux

CVSS: 9.8v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-74597DEBIAN-CVE-2026-74597
Published 22-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74597 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.54%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 16
MGASA-2026-0506OPENSUSE-SU-2026:22091-1SUSE-SU-2026:4639-1SUSE-SU-2026:4640-1SUSE-SU-2026:4660-1SUSE-SU-2026:4665-1

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: clear skb2->cb[] in ip6ip6_err() ip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the quoted inner IPv6 packet, and then passes the clone to icmpv6_send(). The clone still carries the outer packet's inet6_skb_parm in skb->cb. If the outer packet had a Home Address Option, IP6CB(skb2)->dsthao remains non-zero after skb_pull(). icmpv6_send() later calls mip6_addr_swap(), which uses that stale dsthao offset against the quoted inner packet. A malformed inner destination-options header can then make the HAO lookup and address swap run past the end of the quoted packet and corrupt skb_shared_info. Clear skb2->cb[] before pulling the quoted inner IPv6 packet so the reply path does not reuse metadata left by the outer IPv6 stack.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.54%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

+0.03 pp

From 0.51% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.54%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ e490d1d85cf5e191791979e5f260d32eb4f703a8, < 44fe898df302e91c5ee5acbc71ffa74e78e6c183 | ≥ e490d1d85cf5e191791979e5f260d32eb4f703a8, < 0dadb0620ab65949a8bc2439dd28ea3c942fe87d | ≥ e490d1d85cf5e191791979e5f260d32eb4f703a8, < b6816536a2990c0db44a26130a03e40b441e829b | ≥ e490d1d85cf5e191791979e5f260d32eb4f703a8, < 64e41736a26f37ab6215bc2e6df125df05aceb08 | ≥ e490d1d85cf5e191791979e5f260d32eb4f703a8, < 484134e1eb07d700a73b1e4bbf3fb503e299be60 | ≥ e490d1d85cf5e191791979e5f260d32eb4f703a8, < 4eb15c465337b18f44716c499cd6ad63eee0ad54 | ≥ e490d1d85cf5e191791979e5f260d32eb4f703a8, < fbf40faa0414b753212494ad197542002e66ed9e | ≥ e490d1d85cf5e191791979e5f260d32eb4f703a8, < f803c086399da277b5d0ff36a107d0f162751800 | 2.6.22

3 vendors · 172 products

References

18 links
Show all 18 references