CVE-2024-57947 (GCVE-0-2024-57947)

Vulnerability from cvelistv5 – Published: 2025-01-23 13:54 – Updated: 2026-08-05 11:47
VLAI
Title
netfilter: nf_set_pipapo: fix initial map fill
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_set_pipapo: fix initial map fill The initial buffer has to be inited to all-ones, but it must restrict it to the size of the first field, not the total field size. After each round in the map search step, the result and the fill map are swapped, so if we have a set where f->bsize of the first element is smaller than m->bsize_max, those one-bits are leaked into future rounds result map. This makes pipapo find an incorrect matching results for sets where first field size is not the largest. Followup patch adds a test case to nft_concat_range.sh selftest script. Thanks to Stefano Brivio for pointing out that we need to zero out the remainder explicitly, only correcting memset() argument isn't enough.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 77bf0c4ab928ca4c9a99311f4f70ba0c17fecba9 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 957a4d1c4c5849e4515c9fb4db21bf85318103dc (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 9625c46ce6fd4f922595a4b32b1de5066d70464f (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 69b6a67f7052905e928d75a0c5871de50e686986 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 8058c88ac0df21239daee54b5934d5c80ca9685f (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 791a615b7ad2258c560f91852be54b0480837c93 (git)
Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.103 , ≤ 6.1.* (semver)
Unaffected: 6.6.44 , ≤ 6.6.* (semver)
Unaffected: 6.10.3 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:N - The buggy `nft_pipapo_lookup()` is the per-packet set-matching op invoked from `nft_lookup_eval` on header fields (`ip saddr . tcp dport . meta l4proto`) taken directly from received packets, so a remote off-host attacker\u0027s traffic drives the defective classification. The generic C path is what runs on all non-x86_64 firewall/router deployments and on x86_64 via the `!irq_fpu_usable()` fallback.\nAC:L - Once a ruleset uses the common concat-range set layout where the first field expands to fewer rules than a later field, the wrong-match behavior is fully deterministic and repeatable \u2014 the attacker simply sends packets and can probe which header values are falsely accepted. No race, no memory-layout dependency, no unknown runtime state.\nPR:N - An unauthenticated, unprivileged remote host needs only to emit packets at the filtering system to reach the miscomputed lookup; no account, credential, or capability on the target is involved. (The control-plane variant via `pipapo_get()` needs only CAP_NET_ADMIN, itself obtainable unprivileged through `unshare -Urn`.)\nUI:N - Classification happens automatically in the packet path for every frame traversing the affected rule; no administrator or victim action is needed for the attacker\u0027s traffic to be misclassified.\nS:U - The defect and its consequences are contained in the kernel\u0027s netfilter/nf_tables engine within a single security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The flaw defeats the packet filter itself: a source address/port/protocol tuple that policy denies falsely matches an allow-set entry, granting an unauthenticated remote attacker reach to services (management ports, databases, internal listeners) whose data the ruleset was configured to keep unreachable, and `map` sets can steer traffic to an unintended internal destination.\nI:H - The kernel silently enforces a falsified classification result, accepting traffic that must be dropped, and on the control plane `pipapo_get()` makes `nft get/add/delete element` operate on the wrong element, so a delete removes an unrelated entry and the enforced security policy is corrupted without any error being reported.\nA:H - The same systematic false-positive makes permitted traffic match drop/reject entries, persistently blackholing legitimate flows, while insert returning spurious `-EEXIST`/`-ENOTEMPTY` and deletes hitting the wrong element leave the administrator unable to repair the ruleset \u2014 a sustained loss of filtering and connectivity for the affected services."
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        "dateUpdated": "2026-08-05T11:47:01.966Z",
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    "cveId": "CVE-2024-57947",
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    "dateReserved": "2025-01-19T11:50:08.380Z",
    "dateUpdated": "2026-08-05T11:47:01.966Z",
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Despu\u00e9s de cada ronda en el paso de b\u00fasqueda del mapa, el resultado y el mapa de relleno se intercambian, as\u00ed que si tenemos un conjunto donde f-\u0026gt;bsize del primer elemento es menor que m-\u0026gt;bsize_max, esos unos bits se filtran en el mapa de resultados de rondas futuras. Esto hace que pipapo encuentre resultados coincidentes incorrectos para conjuntos donde el tama\u00f1o del primer campo no es el m\u00e1s grande. El parche de seguimiento agrega un caso de prueba al script de autoprueba nft_concat_range.sh. Gracias a Stefano Brivio por se\u00f1alar que necesitamos poner a cero el resto expl\u00edcitamente, solo corregir el argumento memset() no es 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T14:03:25+00:00",
      "cve": "CVE-2024-57947",
      "id": "CVE-2024-57947",
      "initial_release_date": "2024-01-01T00:00:00+00:00",
      "product_status:fixed": "280",
      "product_status:known_affected": "70",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nf_set_pipapo: fix initial map fill",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-57947.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-25T01:13:24Z",
      "cve": "CVE-2024-57947",
      "id": "CVE-2024-57947",
      "initial_release_date": "2025-01-24T03:47:20Z",
      "product_status:known_affected": "380",
      "product_status:known_not_affected": "130",
      "product_status:recommended": "685",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-57947",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-57947.json",
      "version": "77"
    }
  }
}



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  • 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.


Detection rules are retrieved from Rulezet.