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

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Summary

CVECVE-2026-31532
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-23 12:17:01 UTC
Updated2026-06-01 17:16:48 UTC
DescriptionIn 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]

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000240000 probability, percentile 0.067600000 (date 2026-04-27)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a 1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3 git Not specified
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a 64c8553decf5a5f2417bd54761ea0a832c56c4ca git Not specified
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a 3f43f12fde34737fba091b7e3ab391e14ddbb0be git Not specified
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a 5e9cfffad898bbeaafd0ea608a6d267362f050fc git Not specified
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a 572f0bf536ebc14f6e7da3d21a85cf076de8358e git Not specified
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a 1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0 git Not specified
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a 7201a531b9a5ed892bfda5ded9194ef622de8ffa git Not specified
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a 34c1741254ff972e8375faf176678a248826fe3a git Not specified
CNA Linux Linux affected 514ac99c64b22d83b52dfee3b8becaa69a92bc4a a535a9217ca3f2fccedaafb2fddb4c48f27d36dc git Not specified
CNA Linux Linux affected 4.1 Not specified
CNA Linux Linux unaffected 4.1 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/572f0bf536ebc14f6e7da3d21a85cf076de8358e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7201a531b9a5ed892bfda5ded9194ef622de8ffa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/64c8553decf5a5f2417bd54761ea0a832c56c4ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e9cfffad898bbeaafd0ea608a6d267362f050fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a535a9217ca3f2fccedaafb2fddb4c48f27d36dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3f43f12fde34737fba091b7e3ab391e14ddbb0be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/34c1741254ff972e8375faf176678a248826fe3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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