CVE-2026-31532 (GCVE-0-2026-31532)

Vulnerability from cvelistv5 – Published: 2026-04-23 11:12 – Updated: 2026-05-11 22:10
VLAI
Title
can: raw: fix ro->uniq use-after-free in raw_rcv()
Summary
In the Linux kernel, the following vulnerability has been resolved: can: raw: fix ro->uniq use-after-free in raw_rcv() raw_release() unregisters raw CAN receive filters via can_rx_unregister(), but receiver deletion is deferred with call_rcu(). This leaves a window where raw_rcv() may still be running in an RCU read-side critical section after raw_release() frees ro->uniq, leading to a use-after-free of the percpu uniq storage. Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific socket destructor. can_rx_unregister() takes an extra reference to the socket and only drops it from the RCU callback, so freeing uniq from sk_destruct ensures the percpu area is not released until the relevant callbacks have drained. [mkl: applied manually]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 5e9cfffad898bbeaafd0ea608a6d267362f050fc (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 572f0bf536ebc14f6e7da3d21a85cf076de8358e (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0 (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 7201a531b9a5ed892bfda5ded9194ef622de8ffa (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 34c1741254ff972e8375faf176678a248826fe3a (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < a535a9217ca3f2fccedaafb2fddb4c48f27d36dc (git)
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Linux Linux Affected: 4.1
Unaffected: 0 , < 4.1 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)
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}


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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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