CVE-2026-72450 (GCVE-0-2026-72450)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-10-16 18:55
VLAI
EPSS
VEX
Title
xfrm: validate selector family and prefixlen during match
Summary
In the Linux kernel, the following vulnerability has been resolved:
xfrm: validate selector family and prefixlen during match
syzbot reported a shift-out-of-bounds in xfrm_selector_match()
due to AF_UNSPEC selector with large prefixlen (e.g. 128) matched
against IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).
Fix this by:
- Rejecting mismatched families in xfrm_selector_match.
- Returning false in addr4_match if prefixlen > 32.
- Returning false in addr_match if prefixlen > 128 (prevents overflow).
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:50 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8df5cd51fd70c33aa1776e5cbcd82b0a86649d73 , < 87a5bbccc7ff4edb3f42fea387124237d2ba91ee
(git)
Affected: 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71 , < bd7f202cf77556cff59f68dc30e4cdf40cb6e33b (git) Affected: bce1afaa212ec380bf971614f70909a27882b862 , < a3968ad4195d72c8fddcc6c0ef39da95ac98711a (git) Affected: 7d9868180bd1e4cf37e7c5067362658971162366 , < efa9e3b9f3dea2e1ea4c7edf4edc863faef85986 (git) Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 78783fefdc8f36879b1a17efa0d3195ea5f2dc5f (git) Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe (git) Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 5a03a2ee17e8259dde631ed84fd8322db06cb2ae (git) Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 40f0b1047918539f0b0f795ac65e35336b4c2c78 (git) Affected: f31398570acf0f0804c644006f7bfa9067106b0a (git) Affected: 401ad99a5ae7180dd9449eac104cb755f442e7f3 (git) Affected: e68dd80ba498265d2266b12dc3459164f4ff0c4a (git) Affected: 5.10.229 , < 5.10.261 (semver) Affected: 5.15.170 , < 5.15.212 (semver) Affected: 6.1.115 , < 6.1.178 (semver) Affected: 6.6.59 , < 6.6.145 (semver) Affected: 4.19.323 , < 4.20 (semver) Affected: 5.4.285 , < 5.5 (semver) Affected: 6.11.6 , < 6.12 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.12
Unaffected: 0 , < 6.12 (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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"id": "CVE-2026-72450",
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"product_status:known_affected": "246",
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"status": "final",
"title": "kernel: xfrm: validate selector family and prefixlen during match",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72450.json",
"version": "3"
},
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"title": "CISA ADP Vulnrichment"
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{
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"value": "AV:L - The bug is armed via NETLINK_XFRM (XFRM_MSG_NEWSA with XFRM_STATE_AF_UNSPEC) in xfrm_user_rcv_msg(), and per kernel CNA guidance xfrm/netlink configuration is Local even though xfrm_selector_match() is later hit from IPv4/IPv6 packet processing in __xfrm_policy_check() and xfrm_state_look_at().\nAC:L - The attacker fully controls the malformed SA selector (AF_UNSPEC with prefixlen up to 255) and can deterministically trigger matching by sending or receiving IPv4/IPv6 traffic through xfrm; no race, victim state, or memory layout outside attacker control is required.\nPR:L - xfrm_user_rcv_msg() requires netlink_net_capable(CAP_NET_ADMIN), evaluated against the socket net namespace user_ns via ns_capable(); an unprivileged local user obtains CAP_NET_ADMIN with unshare -Urn and can install the poisoned SA and matching policy in that namespace.\nUI:N - The attacker performs the entire sequence\u2014installing the XFRM SA/policy over netlink and generating matching traffic\u2014with no action required from any other user, administrator, or victim.\nS:U - The shift-out-of-bounds and out-of-bounds memcmp reads occur entirely within kernel xfrm selector matching on the same host; no VM escape, IOMMU bypass, or cross-security-authority boundary is crossed.\nC:H - addr4_match() performs an undefined left-shift when prefixlen\u003e32 on IPv4 flows, and addr_match() can memcmp() up to (prefixlen\u003e\u003e5)\u003c\u003c2 bytes past 16-byte selector/flow addresses when prefixlen\u003e128 on IPv6, leaking adjacent kernel memory per CNA OOB-read guidance.\nI:H - C11 undefined-behavior shifts in hot-path packet classification and unchecked prefix comparisons can corrupt mask/offset arithmetic and selector-match control flow, giving attacker-influenced kernel behavior exploitable for integrity compromise per CNA memory-unsafe-operation guidance.\nA:H - syzbot reproduced UBSAN shift-out-of-bounds in xfrm_selector_match(), and undefined shifts plus out-of-bounds reads in the xfrm input/policy-check path can provoke kernel oops/panic (especially with panic_on_warn/KASAN), satisfying CNA guidance that kernel crashes are High availability impact."
}
]
}
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}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.