CVE-2025-38460 (GCVE-0-2025-38460)

Vulnerability from cvelistv5 – Published: 2025-07-25 15:27 – Updated: 2026-10-15 21:52
VLAI
Title
atm: clip: Fix potential null-ptr-deref in to_atmarpd().
Summary
In the Linux kernel, the following vulnerability has been resolved: atm: clip: Fix potential null-ptr-deref in to_atmarpd(). atmarpd is protected by RTNL since commit f3a0592b37b8 ("[ATM]: clip causes unregister hang"). However, it is not enough because to_atmarpd() is called without RTNL, especially clip_neigh_solicit() / neigh_ops->solicit() is unsleepable. Also, there is no RTNL dependency around atmarpd. Let's use a private mutex and RCU to protect access to atmarpd in to_atmarpd().
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/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 2026-10-15 21:50 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a4c5785feb979cd996a99cfaad8bf353b2e79301 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 70eac9ba7ce25d99c1d99bbf4ddb058940f631f9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3251ce3979f41bd228f77a7615f9dd616d06a110 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ee4d9e4ddf3f9c4ee2ec0a3aad6196ee36d30e57 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 06935c50cfa3ac57cce80bba67b6d38ec1406e92 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 36caab990b69ef4eec1d81c52a19f080b7daa059 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f58e4270c73e7f086322978d585ea67c8076ce49 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 706cc36477139c1616a9b2b96610a8bb520b7119 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.296 , ≤ 5.4.* (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.99 , ≤ 6.6.* (semver)
Unaffected: 6.12.39 , ≤ 6.12.* (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                  "value": "AV:L - The race is driven from local context \u2014 an ATM socket\u0027s ATMARPD_CTRL open/close on one side and local packet transmission over the atm%d CLIP device (clip_start_xmit/clip_neigh_solicit) on the other. Received network packets can only supply one half of the race and give a remote party no influence over the teardown side, so Local is the accurate vector.\nAC:H - Scoring the security-meaningful attacker (unprivileged local user), the exploit requires being inside to_atmarpd() exactly while atmarpd_close() NULLs and frees the daemon\u0027s vcc \u2014 the daemon teardown is a system condition that an unprivileged attacker cannot induce, even though they can hammer the trigger path continuously.\nPR:L - No privileges are needed to reach the vulnerable function: any local user sending IP traffic to unresolved addresses on a configured CLIP interface drives clip_start_xmit()/clip_neigh_solicit() \u2192 to_atmarpd(). Only the administrative setup (SIOCMKCLIP/ATMARPD_CTRL, capable(CAP_NET_ADMIN)) is privileged, and that is the pre-existing deployment, not the attack.\nUI:N - No victim action is required \u2014 the attacker\u0027s own traffic triggers the vulnerable path, and the daemon-teardown condition is accounted for in Attack Complexity rather than user interaction.\nS:U - Both the flaw and its impact are confined to the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Winning the race leaves the racing thread operating on a freed struct atm_vcc/sock allocated from the generic kmalloc caches, and a use-after-free of a sprayable sock object can be leveraged to read kernel memory.\nI:H - The stale pointer is used for an atomic_add() write, an skb_queue_tail() list insertion into freed memory, and an indirect call through the freed sock\u0027s sk_data_ready() \u2014 a write primitive plus control-flow hijack after heap grooming.\nA:H - The minimum outcome is a kernel oops \u2014 a NULL (or freed) sock dereference in atm_force_charge()/skb_queue_tail() and a call through a NULL/garbage sk_data_ready pointer \u2014 panicking the system."
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}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

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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.