ipv6: reject malicious packets in ipv6_gso_segment()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-38572
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-08-19 17:15:34 UTC
Updated2026-07-30 06:23:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ipv6: reject malicious packets in ipv6_gso_segment() syzbot was able to craft a packet with very long IPv6 extension headers leading to an overflow of skb->transport_header. This 16bit field has a limited range. Add skb_reset_transport_header_careful() helper and use it from ipv6_gso_segment() WARNING: CPU: 0 PID: 5871 at ./include/linux/skbuff.h:3032 skb_reset_transport_header include/linux/skbuff.h:3032 [inline] WARNING: CPU: 0 PID: 5871 at ./include/linux/skbuff.h:3032 ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151 Modules linked in: CPU: 0 UID: 0 PID: 5871 Comm: syz-executor211 Not tainted 6.16.0-rc6-syzkaller-g7abc678e3084 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:skb_reset_transport_header include/linux/skbuff.h:3032 [inline] RIP: 0010:ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151 Call Trace: <TASK> skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53 nsh_gso_segment+0x54a/0xe10 net/nsh/nsh.c:110 skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53 __skb_gso_segment+0x342/0x510 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0x857/0x11b0 net/core/dev.c:3950 validate_xmit_skb_list+0x84/0x120 net/core/dev.c:4000 sch_direct_xmit+0xd3/0x4b0 net/sched/sch_generic.c:329 __dev_xmit_skb net/core/dev.c:4102 [inline] __dev_queue_xmit+0x17b6/0x3a70 net/core/dev.c:4679

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 5dc60b2a00ed7629214ac0c48e43f40af2078703 git Not specified
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 3f638e0b28bde7c3354a0df938ab3a96739455d1 git Not specified
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 09ff062b89d8e48165247d677d1ca23d6d607e9b git Not specified
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 de322cdf600fc9433845a9e944d1ca6b31cfb67e git Not specified
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 ef05007b403dcc21e701cb1f30d4572ac0a9da20 git Not specified
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 5489e7fc6f8be3062f8cb7e49406de4bfd94db67 git Not specified
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 573b8250fc2554761db3bc2bbdbab23789d52d4e git Not specified
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 ee851768e4b8371ce151fd446d24bf3ae2d18789 git Not specified
CNA Linux Linux affected d1da932ed4ecad2a14cbcc01ed589d617d0f0f09 d45cf1e7d7180256e17c9ce88e32e8061a7887fe git Not specified
CNA Linux Linux affected 3.8 Not specified
CNA Linux Linux unaffected 3.8 semver Not specified
CNA Linux Linux unaffected 5.4.297 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.241 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.190 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.148 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.102 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.42 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.10 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.1 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ee851768e4b8371ce151fd446d24bf3ae2d18789 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/5dc60b2a00ed7629214ac0c48e43f40af2078703 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3f638e0b28bde7c3354a0df938ab3a96739455d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5489e7fc6f8be3062f8cb7e49406de4bfd94db67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/09ff062b89d8e48165247d677d1ca23d6d607e9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ef05007b403dcc21e701cb1f30d4572ac0a9da20 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/de322cdf600fc9433845a9e944d1ca6b31cfb67e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d45cf1e7d7180256e17c9ce88e32e8061a7887fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/573b8250fc2554761db3bc2bbdbab23789d52d4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
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