ipv6: sit: reload inner IPv6 header after GSO offloads

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Summary

CVECVE-2026-53228
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:40 UTC
Updated2026-06-28 08:16:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ipv6: sit: reload inner IPv6 header after GSO offloads ipip6_tunnel_xmit() caches the inner IPv6 header pointer at function entry and continues using it after iptunnel_handle_offloads(). For GSO skbs, iptunnel_handle_offloads() calls skb_header_unclone(). When the skb header is cloned, skb_header_unclone() can call pskb_expand_head(), which may move the skb head. The pskb_expand_head() contract requires pointers into the skb header to be reloaded after the call. If the later skb_realloc_headroom() branch is not taken, SIT uses the stale iph6 pointer to read the inner hop limit and DS field. That can read from a freed skb head after the old head's remaining clone is released. Reload iph6 after the offload helper succeeds and before subsequent reads from the inner IPv6 header. Keep the existing reload after skb_realloc_headroom(), since that branch can also replace the skb.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001840000 probability, percentile 0.082210000 (date 2026-06-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 14909664e4e192f4c6f6fcdccd9919af7cf783ab fddd41445a0537b093e6b3f6232c9933cad1e48b git Not specified
CNA Linux Linux affected 14909664e4e192f4c6f6fcdccd9919af7cf783ab 1132e5edc2866c3530be17622153a597095f0e43 git Not specified
CNA Linux Linux affected 14909664e4e192f4c6f6fcdccd9919af7cf783ab 9c67b44edb3598d234efae6e44649eb993c03da5 git Not specified
CNA Linux Linux affected 14909664e4e192f4c6f6fcdccd9919af7cf783ab 0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0 git Not specified
CNA Linux Linux affected 14909664e4e192f4c6f6fcdccd9919af7cf783ab 59f80c919713250fe5d25a4d9aea4e49580fa1d4 git Not specified
CNA Linux Linux affected 14909664e4e192f4c6f6fcdccd9919af7cf783ab 2fa49b2715e1bad12ce3b0fa64e234d9582c8193 git Not specified
CNA Linux Linux affected 14909664e4e192f4c6f6fcdccd9919af7cf783ab cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c git Not specified
CNA Linux Linux affected 14909664e4e192f4c6f6fcdccd9919af7cf783ab f0e42f0c4337b1f220de1ddd63f47197c7dee4de git Not specified
CNA Linux Linux affected 3.18 Not specified
CNA Linux Linux unaffected 3.18 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2fa49b2715e1bad12ce3b0fa64e234d9582c8193 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0e42f0c4337b1f220de1ddd63f47197c7dee4de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1132e5edc2866c3530be17622153a597095f0e43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fddd41445a0537b093e6b3f6232c9933cad1e48b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/59f80c919713250fe5d25a4d9aea4e49580fa1d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c67b44edb3598d234efae6e44649eb993c03da5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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