misc: fastrpc: fix use-after-free race in fastrpc_map_create

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Summary

CVECVE-2026-53160
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:33 UTC
Updated2026-06-28 08:16:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: fix use-after-free race in fastrpc_map_create fastrpc_map_lookup returns a raw pointer after releasing fl->lock. The caller fastrpc_map_create then calls fastrpc_map_get (kref_get_unless_zero) on this unprotected pointer. A concurrent MEM_UNMAP can free the map between the lock release and the kref operation, resulting in a use-after-free on the freed slab object. Restore the take_ref parameter to fastrpc_map_lookup so the reference is acquired atomically under fl->lock before the pointer is exposed to the caller.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001720000 probability, percentile 0.069030000 (date 2026-06-27)

VersionSourceTypeScoreSeverityVector
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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0b70ec82b309a4093106ff399da1911ad23b52d3 0a3b87293fbd34fda651e6aead9964f84b893962 git Not specified
CNA Linux Linux affected d7513b47082c08105e837b06cebeb3f07a5fa56f 8b080c89183196fd3e49212f2a1a1c4a29335b9c git Not specified
CNA Linux Linux affected 802359a52676176b18713e33caa17572ad009057 5b0166112019d1dce30b976ab28fd67f7f0be532 git Not specified
CNA Linux Linux affected 10df039834f84a297c72ec962c0f9b7c8c5ca31a 992f121796b7ca83a5a8b93da24e971363206218 git Not specified
CNA Linux Linux affected 10df039834f84a297c72ec962c0f9b7c8c5ca31a f20f6512ecb75c816e0debf4551a138f098615c4 git Not specified
CNA Linux Linux affected 10df039834f84a297c72ec962c0f9b7c8c5ca31a 07ebe87915d8accdaba20c4f88c5ae430fe62fbb git Not specified
CNA Linux Linux affected f3f59bab68e9bc714f757ab22f3fb36153014043 git Not specified
CNA Linux Linux affected 6.1.156 6.1.176 semver Not specified
CNA Linux Linux affected 6.6.112 6.6.143 semver Not specified
CNA Linux Linux affected 6.12.53 6.12.94 semver Not specified
CNA Linux Linux affected 6.17.3 6.18 semver Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8b080c89183196fd3e49212f2a1a1c4a29335b9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5b0166112019d1dce30b976ab28fd67f7f0be532 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a3b87293fbd34fda651e6aead9964f84b893962 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/992f121796b7ca83a5a8b93da24e971363206218 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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