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CVE-2025-22004 (GCVE-0-2025-22004)

Vulnerability from cvelistv5 – Published: 2025-04-03 07:19 – Updated: 2026-08-05 11:55
VLAI
Title
net: atm: fix use after free in lec_send()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: atm: fix use after free in lec_send() The ->send() operation frees skb so save the length before calling ->send() to avoid a use after free.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-03 15:25 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 50e288097c2c6e5f374ae079394436fc29d1e88e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8cd90c7db08f32829bfa1b5b2b11fbc542afbab7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 82d9084a97892de1ee4881eb5c17911fcd9be6f6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 51e8be9578a2e74f9983d8fd8de8cafed191f30c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9566f6ee13b17a15d0a47667ad1b1893c539f730 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 326223182e4703cde99fdbd36d07d0b3de9980fb (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3271f7548385e0096739965961c7cbf7e6b4762 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3009d0d6ab78053117f8857b921a8237f4d17b3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.292 , ≤ 5.4.* (semver)
Unaffected: 5.10.236 , ≤ 5.10.* (semver)
Unaffected: 5.15.180 , ≤ 5.15.* (semver)
Unaffected: 6.1.132 , ≤ 6.1.* (semver)
Unaffected: 6.6.85 , ≤ 6.6.* (semver)
Unaffected: 6.12.21 , ≤ 6.12.* (semver)
Unaffected: 6.13.9 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "dateUpdated": "2026-08-05T11:55:57.189Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T16:26:59+00:00",
      "cve": "CVE-2025-22004",
      "id": "CVE-2025-22004",
      "initial_release_date": "2025-04-03T00:00:00+00:00",
      "product_status:fixed": "1497",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: atm: fix use after free in lec_send()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-22004.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-12T23:52:25Z",
      "cve": "CVE-2025-22004",
      "id": "CVE-2025-22004",
      "initial_release_date": "2025-04-04T02:58:19Z",
      "product_status:known_affected": "460",
      "product_status:recommended": "194",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-22004",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-22004.json",
      "version": "58"
    },
    "vulnrichment": {
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No adjacency is required since a LANE client is an ordinary routed IP host.\\nAC:L - The read-after-free is unconditional on every successful send, with no race and no memory-layout precondition: `adummy_send()` and `atmtcp_v_send()` free the skb synchronously and return 0, after which `lec_send()` always dereferences `skb-\u003elen`. Even against hardware ATM drivers that free asynchronously via `vcc-\u003epop()`, the attacker simply drives traffic to hit it repeatedly.\\nPR:N - Triggering requires no credentials on the target \\u2014 a remote peer merely causes a frame to be transmitted on the emulated LAN. The `capable(CAP_NET_ADMIN)` checks on `ATMLEC_CTRL`/`ATMLEC_DATA` gate only the administrative LANE setup, not the vulnerable transmit path, which is also open to any unprivileged local process via a plain `sendto()`.\\nUI:N - No victim action is needed; the freed-object read happens automatically in the netdevice transmit path and in the `lec_arp_check_expire()` workqueue drain.\\nS:U - The stale read and the corrupted statistics counter are entirely within the kernel\u0027s own security authority, with no crossing into a hypervisor, IOMMU, or sandbox boundary.\\nC:L - The stale `skb-\u003elen` from the freed skbuff is accumulated into `dev-\u003estats.tx_bytes`, which any user can read via `/sys/class/net/lec0/statistics/tx_bytes` or `/proc/net/dev`, yielding a repeatable kernel-heap disclosure \\u2014 but it is strictly bounded to 4 bytes from one fixed offset of a `SLAB_NO_MERGE` cache, so it is a limited leak rather than an arbitrary read.\\nI:L - Nothing is written into the freed object, so there is no memory corruption or write primitive; the only integrity effect is that attacker-influenced garbage is folded into the interface\u0027s `tx_bytes` counter, falsifying kernel-reported accounting data.\\nA:H - This is a genuine use-after-free, and on KASAN- or KFENCE-instrumented kernels the access raises a slab-use-after-free report that panics the machine outright under `panic_on_warn`, which is common in production and CI fleets.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"50e288097c2c6e5f374ae079394436fc29d1e88e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"8cd90c7db08f32829bfa1b5b2b11fbc542afbab7\", \"versionType\": \"git\"}, {\"status\": 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{\"status\": \"unaffected\", \"version\": \"6.12.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/atm/lec.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/50e288097c2c6e5f374ae079394436fc29d1e88e\"}, {\"url\": \"https://git.kernel.org/stable/c/8cd90c7db08f32829bfa1b5b2b11fbc542afbab7\"}, {\"url\": \"https://git.kernel.org/stable/c/82d9084a97892de1ee4881eb5c17911fcd9be6f6\"}, {\"url\": \"https://git.kernel.org/stable/c/51e8be9578a2e74f9983d8fd8de8cafed191f30c\"}, {\"url\": \"https://git.kernel.org/stable/c/9566f6ee13b17a15d0a47667ad1b1893c539f730\"}, {\"url\": \"https://git.kernel.org/stable/c/326223182e4703cde99fdbd36d07d0b3de9980fb\"}, {\"url\": \"https://git.kernel.org/stable/c/f3271f7548385e0096739965961c7cbf7e6b4762\"}, {\"url\": \"https://git.kernel.org/stable/c/f3009d0d6ab78053117f8857b921a8237f4d17b3\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: atm: fix use after free in lec_send()\\n\\nThe -\u003esend() operation frees skb so save the length before calling\\n-\u003esend() to avoid a use after free.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.292\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.236\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.180\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.132\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.85\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.21\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.9\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:55:57.189Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-22004\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:55:57.189Z\", \"dateReserved\": \"2024-12-29T08:45:45.802Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-03T07:19:06.022Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.