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 (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
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)
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)
Create a notification for this product.
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22004",
    "datePublished": "2025-04-03T07:19:06.022Z",
    "dateReserved": "2024-12-29T08:45:45.802Z",
    "dateUpdated": "2026-08-05T11:55:57.189Z",
    "state": "PUBLISHED"
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      "date": "2026-08-05",
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      "cve": "CVE-2025-22004",
      "id": "msrc_CVE-2025-22004",
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      "status": "final",
      "title": "net: atm: fix use after free in lec_send()",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-22004.json",
      "version": "2"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22004\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-03T08:15:15.960\",\"lastModified\":\"2026-07-30T06:22:02.653\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: atm: se corrige el use after free en lec_send() La operaci\u00f3n -\u0026gt;send() libera skb, as\u00ed que guarde la longitud antes de llamar a -\u0026gt;send() para evitar un use after 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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"
    },
    "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\": 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      "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.