CVE-2026-53228: linux
Vulnerability summary
CVE-2026-53228 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 56 · Related 53Timeline
- 25-06-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · ChainguardEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.58%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
+0.06 pp
From 0.51% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu168 products
- linux< 4.4.0-284.318 | < 4.15.0-254.266 | < 5.4.0-234.254 | < 5.15.0-187.197 | < 6.8.0-137.137 | All versions (No fix recorded) | < 7.0.0-29.29
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 4.4.0-1157.163 | < 4.4.0-1195.210 | < 4.15.0-1195.208 | < 5.4.0-1162.173 | < 5.15.0-1113.120 | < 6.8.0-1062.65 | All versions (No fix recorded) | < 7.0.0-1010.10
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Chainguard13 products
- linux-aws-6.12< 6.12.95-r0
- linux-aws-6.18< 6.18.38-r0
- linux-azure-6.12< 6.12.95-r0
- linux-azure-6.18< 6.18.38-r0
- linux-gcp-6.12< 6.12.95-r0
Linux2 products
- linux≥ 14909664e4e192f4c6f6fcdccd9919af7cf783ab, < fddd41445a0537b093e6b3f6232c9933cad1e48b | ≥ 14909664e4e192f4c6f6fcdccd9919af7cf783ab, < 1132e5edc2866c3530be17622153a597095f0e43 | ≥ 14909664e4e192f4c6f6fcdccd9919af7cf783ab, < 9c67b44edb3598d234efae6e44649eb993c03da5 | ≥ 14909664e4e192f4c6f6fcdccd9919af7cf783ab, < 0bfa7bba1f41aaf5f0604dc712bb4701493e3aa0 | ≥ 14909664e4e192f4c6f6fcdccd9919af7cf783ab, < 59f80c919713250fe5d25a4d9aea4e49580fa1d4 | ≥ 14909664e4e192f4c6f6fcdccd9919af7cf783ab, < 2fa49b2715e1bad12ce3b0fa64e234d9582c8193 | ≥ 14909664e4e192f4c6f6fcdccd9919af7cf783ab, < cb658c2f5f7977c2a1c77c9f239f4bc8196edb5c | ≥ 14909664e4e192f4c6f6fcdccd9919af7cf783ab, < f0e42f0c4337b1f220de1ddd63f47197c7dee4de | 3.18
- linux_kernel≥ 3.18, < 5.10.259 | ≥ 5.11, < 5.15.210 | ≥ 5.16, < 6.1.176 | ≥ 6.2, < 6.6.143 | ≥ 6.7, < 6.12.94 | ≥ 6.13, < 6.18.36 | ≥ 6.19, < 7.0.13 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5 | 7.1:rc6 | 7.1:rc7
Debian1 product
- linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.13-1
4 vendors · 184 products
