CVE-2026-72020 (GCVE-0-2026-72020)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
EPSS
VEX
Title
ipvs: reset full ip_vs_seq structs in ip_vs_conn_new
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.
Severity
9.8 (Critical)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
9a05475cebdd6341884b5901e53870be26e65158 , < 3bf9a260188b2a5449cbddc032a749ab433fe328
(git)
Affected: 9a05475cebdd6341884b5901e53870be26e65158 , < 6378c5cb360eb1750f88839d7c3613ea92ac1816 (git) Affected: 9a05475cebdd6341884b5901e53870be26e65158 , < 32c299e28b8eea6cbbd23b97dc61401e9ef9c445 (git) Affected: 9a05475cebdd6341884b5901e53870be26e65158 , < 9e36602cbec552286f7e691cfd366525c565ee74 (git) Affected: 9a05475cebdd6341884b5901e53870be26e65158 , < d0eed7177e822cab83141e5c44b2aa345c7fd379 (git) Affected: 9a05475cebdd6341884b5901e53870be26e65158 , < 83fb4c2c5344f02eac929f66de3c9d1adfcde04c (git) Affected: 9a05475cebdd6341884b5901e53870be26e65158 , < 6335ab62d5fc9ed875279238233fba3462c168f5 (git) Affected: 9a05475cebdd6341884b5901e53870be26e65158 , < 2975324d164c552b028632f107b567302863b7f6 (git) |
guessed | |
| Linux | Linux |
Affected:
3.10
Unaffected: 0 , < 3.10 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: reset full ip_vs_seq structs in 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."
}
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"value": "AV:N - The bug is reached when a host running the IPVS backup sync receiver processes forged UDP sync datagrams (default multicast 224.0.0.81:8848) in ip_vs_process_message(), which is a network packet receive path rather than a local-only ioctl/netlink interface.\nAC:L - Once IPVS backup sync is enabled, an attacker can reliably send IPVS v1 messages that set IP_VS_CONN_F_IN_SEQ/OUT_SEQ while omitting IPVS_OPT_SEQ_DATA; no race, heap grooming, or victim-specific state beyond matching syncid (often 0) is required.\nPR:N - The backup sync socket accepts unauthenticated UDP input with no capability checks; only an optional syncid filter (frequently left at 0) may drop messages, so the attacker needs no Linux privileges to inject the malformed sync records.\nUI:N - No end-user or administrator interaction is required at exploit time; the attacker directly delivers crafted sync messages to the listening backup daemon without victims opening files, clicking links, or changing settings.\nS:U - Exploitation stays within the IPVS load balancer kernel/network authority and affects connections it forwards; it does not constitute a VM escape, sandbox breakout, or cross-security-authority boundary such as guest-to-host.\nC:H - Uninitialized ip_vs_seq init_seq and previous_delta fields retain stale slab data that vs_fix_seq()/vs_fix_ack_seq() apply when rewriting forwarded TCP seq/ack numbers, leaking kernel heap bytes onto the network to clients or backend servers.\nI:H - Those same uninitialized sequence-adjustment fields cause incorrect TCP sequence/ack rewriting in NAT/application-helper paths (ip_vs_app_pkt_in/out), corrupting load-balanced TCP flows and enabling attacker-driven manipulation of forwarded traffic integrity.\nA:H - Corrupted TCP sequence handling breaks or resets connections on the virtual service and can be triggered repeatedly via additional forged sync messages, causing sustained denial of service to load-balanced traffic on the affected backup node."
}
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}
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: reset full ip_vs_seq structs in 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."
}
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"id": "CVE-2026-72020",
"lastModified": "2026-08-17T06:17:59.560",
"metrics": {
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"attackVector": "NETWORK",
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"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
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"redhat_vex": {
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"current_release_date": "2026-08-17T17:00:03+00:00",
"cve": "CVE-2026-72020",
"id": "CVE-2026-72020",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipvs: reset full ip_vs_seq structs in ip_vs_conn_new",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72020.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-24T16:30:09Z",
"cve": "CVE-2026-72020",
"id": "CVE-2026-72020",
"initial_release_date": "2026-08-18T16:55:11Z",
"product_status:first_fixed": "164",
"product_status:known_affected": "607",
"product_status:known_not_affected": "4",
"product_status:recommended": "282",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-72020",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72020.json",
"version": "13"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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