CVE-2025-22004 (GCVE-0-2025-22004)
Vulnerability from cvelistv5 – Published: 2025-04-03 07:19 – Updated: 2026-08-05 11:55
VLAI
EPSS
VEX
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)
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-03 15:25 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
10 references
Impacted products
2 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 | |
| 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 |
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{
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
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"id": "CVE-2025-22004",
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"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": {
"containers": {
"adp": [
{
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"references": [
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},
{
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}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
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"privilegesRequired": "LOW",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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}
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"options": [
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{
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{
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"type": "ssvc"
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"problemTypes": [
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"description": "CWE-416 Use After Free",
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"dateUpdated": "2025-04-03T15:25:38.346Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
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"cna": {
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"product": "Linux",
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},
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{
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"value": "AV:N - The vulnerable code is the TX path of the `lec%d` netdevice, and an unauthenticated remote host reaches it with no local access \u2014 a packet sent to the LANE-attached host elicits a reply transmitted through `lec_start_xmit()` \u2192 `lec_send()`, and in the proxy/bridge mode LANE explicitly supports, a frame received on an Ethernet segment is forwarded straight out the ELAN into the same path. 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."
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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.
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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.
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