CVE-2026-74597
ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
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.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Aug. 22, 2026, 4:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Clear skb2->cb[] before pulling the inner IPv6 packet.
- Ensure skb_shared_info is not corrupted.
- Update the Linux kernel to the latest version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74597.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74597 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74597
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74597 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74597 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'e490d1d85cf5e191791979e5f260d32eb4f703a8', 'lessThan': '44fe898df302e91c5ee5acbc71ffa74e78e6c183', 'versionType': 'git'}, {'status': 'affected', 'version': 'e490d1d85cf5e191791979e5f260d32eb4f703a8', 'lessThan': '0dadb0620ab65949a8bc2439dd28ea3c942fe87d', 'versionType': 'git'}, {'status': 'affected', 'version': 'e490d1d85cf5e191791979e5f260d32eb4f703a8', 'lessThan': 'b6816536a2990c0db44a26130a03e40b441e829b', 'versionType': 'git'}, {'status': 'affected', 'version': 'e490d1d85cf5e191791979e5f260d32eb4f703a8', 'lessThan': '64e41736a26f37ab6215bc2e6df125df05aceb08', 'versionType': 'git'}, {'status': 'affected', 'version': 'e490d1d85cf5e191791979e5f260d32eb4f703a8', 'lessThan': '484134e1eb07d700a73b1e4bbf3fb503e299be60', 'versionType': 'git'}, {'status': 'affected', 'version': 'e490d1d85cf5e191791979e5f260d32eb4f703a8', 'lessThan': '4eb15c465337b18f44716c499cd6ad63eee0ad54', 'versionType': 'git'}, {'status': 'affected', 'version': 'e490d1d85cf5e191791979e5f260d32eb4f703a8', 'lessThan': 'fbf40faa0414b753212494ad197542002e66ed9e', 'versionType': 'git'}, {'status': 'affected', 'version': 'e490d1d85cf5e191791979e5f260d32eb4f703a8', 'lessThan': 'f803c086399da277b5d0ff36a107d0f162751800', 'versionType': 'git'}], 'programFiles': ['net/ipv6/ip6_tunnel.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.22'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.22', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.265', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.216', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.183', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.152', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.104', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/ip6_tunnel.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d Added Reference https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183 Added Reference https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60 Added Reference https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54 Added Reference https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08 Added Reference https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b Added Reference https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800 Added Reference https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e