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CVE-2022-50421 (GCVE-0-2022-50421)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:41 – Updated: 2026-08-05 08:58
VLAI
Title
rpmsg: char: Avoid double destroy of default endpoint
Summary
In the Linux kernel, the following vulnerability has been resolved: rpmsg: char: Avoid double destroy of default endpoint The rpmsg_dev_remove() in rpmsg_core is the place for releasing this default endpoint. So need to avoid destroying the default endpoint in rpmsg_chrdev_eptdev_destroy(), this should be the same as rpmsg_eptdev_release(). Otherwise there will be double destroy issue that ept->refcount report warning: refcount_t: underflow; use-after-free. Call trace: refcount_warn_saturate+0xf8/0x150 virtio_rpmsg_destroy_ept+0xd4/0xec rpmsg_dev_remove+0x60/0x70 The issue can be reproduced by stopping remoteproc before closing the /dev/rpmsgX.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/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 2026-01-14 17:39 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bea9b79c2d10fecf7bfa26e212ecefe61d232e39 , < ef828a39d6a7028836eaf37df3ad568c8c2dd6f9 (git)
Affected: bea9b79c2d10fecf7bfa26e212ecefe61d232e39 , < 3f20ef7a845c2c8d7ec82ecffa20d95cab5ecfeb (git)
Affected: bea9b79c2d10fecf7bfa26e212ecefe61d232e39 , < 467233a4ac29b215d492843d067a9f091e6bf0c5 (git)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-50421\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T17:39:44.735824Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T17:39:40.452Z\"}}], \"cna\": {\"title\": \"rpmsg: char: Avoid double destroy of default endpoint\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable path is reached only through local rpmsg char device operations (/dev/rpmsgX open plus channel/device teardown via remoteproc stop, NS_DESTROY, or RPMSG_RELEASE_DEV_IOCTL); it is not reachable from network packets or adjacent-link protocols.\\nAC:L - With /dev/rpmsgX held open on a default_ept (rpmsg-raw) channel, device removal deterministically double-destroys the same endpoint in rpmsg_chrdev_eptdev_destroy then rpmsg_dev_remove; the attacker who opens the device and triggers teardown fully controls both steps with no race or external precondition.\\nPR:L - On the platforms where RPMSG_CHAR is actually deployed (Android/QCOM, automotive, OpenAMP embedded), /dev/rpmsg* is routinely granted to non-root HALs/service users via udev/sepolicy, and those same contexts can drive channel release or remoteproc restart without full init-namespace root.\\nUI:N - The attacker opens /dev/rpmsgX and triggers device removal themselves; no separate victim action such as mounting a filesystem or opening a crafted file is required.\\nS:U - Impact is a host-kernel heap use-after-free of the rpmsg_endpoint within the same OS security authority, with no VM escape, IOMMU bypass, or other cross-boundary compromise.\\nC:H - The first rpmsg_destroy_ept kfree\u0027s the default endpoint while rpdev-\u003eept still points at it, so the second destroy is a classic UAF on a reclaimable slab object that per guidance enables arbitrary kernel memory disclosure.\\nI:H - The same freed rpmsg_endpoint can be sprayed before the second destroy walks ept-\u003eops/rpdev/refcount, yielding a heap corruption and control-flow hijack primitive consistent with UAF integrity High.\\nA:H - The bug manifests as refcount underflow use-after-free (and kernel oops under KASAN); per guidance any UAF scores Availability High even when not fully exploited for code execution.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"bea9b79c2d10fecf7bfa26e212ecefe61d232e39\", \"lessThan\": \"ef828a39d6a7028836eaf37df3ad568c8c2dd6f9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bea9b79c2d10fecf7bfa26e212ecefe61d232e39\", \"lessThan\": \"3f20ef7a845c2c8d7ec82ecffa20d95cab5ecfeb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"bea9b79c2d10fecf7bfa26e212ecefe61d232e39\", \"lessThan\": \"467233a4ac29b215d492843d067a9f091e6bf0c5\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/rpmsg/rpmsg_char.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.19.17\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.19.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/rpmsg/rpmsg_char.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ef828a39d6a7028836eaf37df3ad568c8c2dd6f9\"}, {\"url\": \"https://git.kernel.org/stable/c/3f20ef7a845c2c8d7ec82ecffa20d95cab5ecfeb\"}, {\"url\": \"https://git.kernel.org/stable/c/467233a4ac29b215d492843d067a9f091e6bf0c5\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrpmsg: char: Avoid double destroy of default endpoint\\n\\nThe rpmsg_dev_remove() in rpmsg_core is the place for releasing\\nthis default endpoint.\\n\\nSo need to avoid destroying the default endpoint in\\nrpmsg_chrdev_eptdev_destroy(), this should be the same as\\nrpmsg_eptdev_release(). Otherwise there will be double destroy\\nissue that ept-\u003erefcount report warning:\\n\\nrefcount_t: underflow; use-after-free.\\n\\nCall trace:\\n refcount_warn_saturate+0xf8/0x150\\n virtio_rpmsg_destroy_ept+0xd4/0xec\\n rpmsg_dev_remove+0x60/0x70\\n\\nThe issue can be reproduced by stopping remoteproc before\\nclosing the /dev/rpmsgX.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19.17\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.3\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"5.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:58:44.673Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-50421\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:58:44.673Z\", \"dateReserved\": \"2025-09-17T14:53:07.004Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-10-01T11:41:54.351Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.