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CVE-2026-31532

can: raw: fix ro->uniq use-after-free in raw_rcv()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.136, 6.12.83, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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]

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in 1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3; From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in 64c8553decf5a5f2417bd54761ea0a832c56c4ca; From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in 3f43f12fde34737fba091b7e3ab391e14ddbb0be; From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in 5e9cfffad898bbeaafd0ea608a6d267362f050fc; From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in 572f0bf536ebc14f6e7da3d21a85cf076de8358e; From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in 1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0; From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in 7201a531b9a5ed892bfda5ded9194ef622de8ffa; From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in 34c1741254ff972e8375faf176678a248826fe3a; From 514ac99c64b22d83b52dfee3b8becaa69a92bc4a · fixed in a535a9217ca3f2fccedaafb2fddb4c48f27d36dc

  • Linux Linux

    4.1

  • KernelLinux

    From 4.1.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.136; From 6.7.0 · fixed in 6.12.83; From 6.13.0 · fixed in 6.18.24; From 6.19.0 · fixed in 6.19.14; From 6.20.0 · fixed in 7.0.1

References 9

git.kernel.org