Answer in brief
CVE-2026-53228 records a Critical severity (CVSS 9.8) vulnerability in ipv6: sit: reload inner IPv6 header after GSO offloads. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-53228 records a Critical severity (CVSS 9.8) vulnerability in ipv6: sit: reload inner IPv6 header after GSO offloads. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <fddd41445a0537b093e6b3f6232c9933cad1e48b || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <1132e5edc2866c3530be17622153a597095f0e43 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <9c67b44edb3598d234efae6e44649eb993c03da5 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <59f80c919713250fe5d25a4d9aea4e49580fa1d4 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <2fa49b2715e1bad12ce3b0fa64e234d9582c8193 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <f0e42f0c4337b1f220de1ddd63f47197c7dee4de | fddd41445a0537b093e6b3f6232c9933cad1e48b, 1132e5edc2866c3530be17622153a597095f0e43, 9c67b44edb3598d234efae6e44649eb993c03da5, 0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0, 59f80c919713250fe5d25a4d9aea4e49580fa1d4, 2fa49b2715e1bad12ce3b0fa64e234d9582c8193, cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c, f0e42f0c4337b1f220de1ddd63f47197c7dee4de |
| Linux/Linuxgeneric | 3.18 | Not reported |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <fddd41445a0537b093e6b3f6232c9933cad1e48b || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <1132e5edc2866c3530be17622153a597095f0e43 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <9c67b44edb3598d234efae6e44649eb993c03da5 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <59f80c919713250fe5d25a4d9aea4e49580fa1d4 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <2fa49b2715e1bad12ce3b0fa64e234d9582c8193 || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c || >=14909664e4e192f4c6f6fcdccd9919af7cf783ab <f0e42f0c4337b1f220de1ddd63f47197c7dee4de | fddd41445a0537b093e6b3f6232c9933cad1e48b, 1132e5edc2866c3530be17622153a597095f0e43, 9c67b44edb3598d234efae6e44649eb993c03da5, 0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0, 59f80c919713250fe5d25a4d9aea4e49580fa1d4, 2fa49b2715e1bad12ce3b0fa64e234d9582c8193, cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c, f0e42f0c4337b1f220de1ddd63f47197c7dee4de |
| Linux/Linuxgeneric | 3.18 | Not reported |
Published upstream
Jun 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.