CVE-2026-72020 (GCVE-0-2026-72020)
Vulnerability from cvelistv5
Published
2026-08-15 05:51
Modified
2026-10-19 21:19
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ipvs: reset full ip_vs_seq structs in ip_vs_conn_new Commit 9a05475cebdd ("ipvs: avoid kmem_cache_zalloc in ip_vs_conn_new") changed ip_vs_conn_new() to allocate an ip_vs_conn object with kmem_cache_alloc(). The function then initializes many fields explicitly, but only resets in_seq.delta and out_seq.delta in the two struct ip_vs_seq members. That leaves init_seq and previous_delta uninitialized. This is normally harmless while the corresponding IP_VS_CONN_F_IN_SEQ or IP_VS_CONN_F_OUT_SEQ flag is clear. For connections learned from a sync message, however, ip_vs_proc_conn() preserves those flags from IP_VS_CONN_F_BACKUP_MASK and passes opt=NULL when the message omits IPVS_OPT_SEQ_DATA. In that case the new connection can be hashed with SEQ flags set but with the rest of in_seq/out_seq still containing stale slab data. When a packet for such a connection is later handled by an IPVS application helper, vs_fix_seq() and vs_fix_ack_seq() use previous_delta and init_seq to rewrite TCP sequence numbers. A malformed sync message can therefore make forwarded packets carry stale slab bytes in their TCP seq/ack numbers, and can also corrupt the forwarded TCP flow. Reset both struct ip_vs_seq members completely before publishing the connection. This matches the existing "reset struct ip_vs_seq" comment and keeps the sequence-adjustment gates inactive unless valid sequence data is installed later.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9a05475cebdd6341884b5901e53870be26e65158
Version: 9a05475cebdd6341884b5901e53870be26e65158
Version: 9a05475cebdd6341884b5901e53870be26e65158
Version: 9a05475cebdd6341884b5901e53870be26e65158
Version: 9a05475cebdd6341884b5901e53870be26e65158
Version: 9a05475cebdd6341884b5901e53870be26e65158
Version: 9a05475cebdd6341884b5901e53870be26e65158
Version: 9a05475cebdd6341884b5901e53870be26e65158
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ip_vs_conn_new\\n\\nCommit 9a05475cebdd (\\\"ipvs: avoid kmem_cache_zalloc in\\nip_vs_conn_new\\\") changed ip_vs_conn_new() to allocate an ip_vs_conn\\nobject with kmem_cache_alloc().  The function then initializes many\\nfields explicitly, but only resets in_seq.delta and out_seq.delta in the\\ntwo struct ip_vs_seq members.\\n\\nThat leaves init_seq and previous_delta uninitialized.  This is normally\\nharmless while the corresponding IP_VS_CONN_F_IN_SEQ or\\nIP_VS_CONN_F_OUT_SEQ flag is clear.  For connections learned from a sync\\nmessage, however, ip_vs_proc_conn() preserves those flags from\\nIP_VS_CONN_F_BACKUP_MASK and passes opt=NULL when the message omits\\nIPVS_OPT_SEQ_DATA.  In that case the new connection can be hashed with\\nSEQ flags set but with the rest of in_seq/out_seq still containing stale\\nslab data.\\n\\nWhen a packet for such a connection is later handled by an IPVS\\napplication helper, vs_fix_seq() and vs_fix_ack_seq() use\\nprevious_delta and init_seq to rewrite TCP sequence numbers.  A malformed\\nsync message can therefore make forwarded packets carry stale slab bytes\\nin their TCP seq/ack numbers, and can also corrupt the forwarded TCP\\nflow.\\n\\nReset both struct ip_vs_seq members completely before publishing the\\nconnection.  This matches the existing \\\"reset struct ip_vs_seq\\\" comment\\nand keeps the sequence-adjustment gates inactive unless valid sequence\\ndata is installed later.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:39:30.496Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72020\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:19:23.243Z\", \"dateReserved\": \"2026-08-09T03:40:39.900Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:51:46.675Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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