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inetpeer: randomize RB-tree node comparison using SipHash

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: inetpeer: randomize RB-tree node comparison using SipHash The inetpeer rate limiting system stores peer entries in a Red-Black tree keyed deterministically on the remote IP address. Because tree lookups walk the RB-tree using standard lexicographical comparisons (inetpeer_addr_cmp), an off-path adversary can predict the exact topology of the tree and the sequence of nodes traversed during lookups (the gc_stack candidate list). By combining deterministic tree traversal with aggressive garbage collection (triggered when tree size exceeds inet_peer_threshold), an attacker can selectively force the eviction of targeted inet_peer nodes. When an evicted node is subsequently re-created upon receiving a new packet, its rate-limiting token bucket (rate_tokens, rate_last) is reset to full capacity. This creates a side-channel primitive allowing off-path attackers to bypass IP-keyed ICMP rate limits and infer open UDP ports (similar to SAD DNS style attacks). Mitigate this by randomizing the RB-tree node comparison logic using SipHash with a secret key (inetpeer_hash_key) initialized via net_get_random_once(). Nodes are ordered in the tree by SipHash(addr, key) rather than raw IP addresses. Because the secret key is unknown to external entities, the tree layout and lookup traversal paths are unpredictable to off-path adversaries, breaking the deterministic eviction gadget. Cache the computed 64-bit SipHash (hash) in str

Announced Group revision 1
Original source ↗

CVE-2026-90110

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90110

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b145425f269a17ed344d737f746b844dfac60c82",
        "lessThan": "b20e98f0bb668a59abaf7bcf85d75c073e90d352",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b145425f269a17ed344d737f746b844dfac60c82",
        "lessThan": "5f127e3cc9647a8a70db12c65dbd0de473545380",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b145425f269a17ed344d737f746b844dfac60c82",
        "lessThan": "199fcf285e498111e029137d088949bc6c26d578",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b145425f269a17ed344d737f746b844dfac60c82",
        "lessThan": "857681f6835d5b0a7bc4a34a026baeaaf5215623",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b145425f269a17ed344d737f746b844dfac60c82",
        "lessThan": "7109bb63667a53e4542ad845476f97d0c8b28a61",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b145425f269a17ed344d737f746b844dfac60c82",
        "lessThan": "2ee66e9487172fcd189bc52a767c30dad7141c09",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/net/inetpeer.h",
      "net/ipv4/inetpeer.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/inetpeer.h",
      "net/ipv4/inetpeer.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90110

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#36515 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-90110 · Revision 1Source updated