CVE-2026-43502 (GCVE-0-2026-43502)

Vulnerability from cvelistv5 – Published: 2026-05-21 12:17 – Updated: 2026-08-05 12:28
VLAI
Title
net/rds: handle zerocopy send cleanup before the message is queued
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rds: handle zerocopy send cleanup before the message is queued A zerocopy send can fail after user pages have been pinned but before the message is attached to the sending socket. The purge path currently infers zerocopy state from rm->m_rs, so an unqueued message can be cleaned up as if it owned normal payload pages. However, zerocopy ownership is really determined by the presence of op_mmp_znotifier, regardless of whether the message has reached the socket queue. Capture op_mmp_znotifier up front in rds_message_purge() and use it as the cleanup discriminator. If the message is already associated with a socket, keep the existing completion path. Otherwise, drop the pinned page accounting directly and release the notifier before putting the payload pages. This keeps early send failure cleanup consistent with the zerocopy lifetime rules without changing the normal queued completion path.
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: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < e9aefdc5c53fe9aed108c14e3d155710a1bb14c9 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 46662f7dc59475995609bf3e9d27eb36f4acf26f (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 1e262db7675e27f42c3f3f47d6011855f4454f24 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 21d70744e6d3bbf9293aa1ee6fba7c53ad75275e (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 3abc8983b2bae3f487f77d9da5527d7d6b210d46 (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 14ef6fd18db2494098b21e0471bf27a1d8e9993e (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b (git)
Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 44b550d88b267320459d518c0743a241ab2108fa (git)
Create a notification for this product.
Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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If the message is already associated with a\\nsocket, keep the existing completion path. Otherwise, drop the pinned\\npage accounting directly and release the notifier before putting the\\npayload pages.\\n\\nThis keeps early send failure cleanup consistent with the zerocopy\\nlifetime rules without changing the normal queued completion path.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnet/rds: manejar la limpieza de env\u00edo de zerocopy antes de que el mensaje sea encolado\\n\\nUn env\u00edo zerocopy puede fallar despu\u00e9s de que las p\u00e1ginas de usuario hayan sido fijadas pero antes de que el mensaje sea adjuntado al socket de env\u00edo.\\n\\nLa ruta de purga actualmente infiere el estado zerocopy de rm-\u003em_rs, por lo que un mensaje no encolado puede ser limpiado como si poseyera p\u00e1ginas de carga \u00fatil normales. Sin embargo, la propiedad zerocopy es realmente determinada por la presencia de op_mmp_znotifier, independientemente de si el mensaje ha llegado a la cola del socket.\\n\\nCapturar op_mmp_znotifier de antemano en rds_message_purge() y usarlo como discriminador de limpieza. Si el mensaje ya est\u00e1 asociado con un socket, mantener la ruta de finalizaci\u00f3n existente. De lo contrario, descartar la contabilidad de p\u00e1ginas fijadas directamente y liberar el notificador antes de colocar las p\u00e1ginas de carga \u00fatil.\\n\\nEsto mantiene la limpieza temprana de fallos de env\u00edo consistente con las reglas de vida \u00fatil de zerocopy sin cambiar la ruta de finalizaci\u00f3n encolada normal.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/rds/message.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\",\"lessThan\":\"e9aefdc5c53fe9aed108c14e3d155710a1bb14c9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\",\"lessThan\":\"46662f7dc59475995609bf3e9d27eb36f4acf26f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\",\"lessThan\":\"1e262db7675e27f42c3f3f47d6011855f4454f24\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\",\"lessThan\":\"21d70744e6d3bbf9293aa1ee6fba7c53ad75275e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\",\"lessThan\":\"3abc8983b2bae3f487f77d9da5527d7d6b210d46\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\",\"lessThan\":\"14ef6fd18db2494098b21e0471bf27a1d8e9993e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\",\"lessThan\":\"0f5c185fc79a59ee9991234dd6d2a3e5afa6e75b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3\",\"lessThan\":\"44b550d88b267320459d518c0743a241ab2108fa\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/rds/message.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.17\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"CF9EFBB4-E004-479B-A237-DECC87FD4D0E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:51:24+00:00",
      "cve": "CVE-2026-43502",
      "id": "CVE-2026-43502",
      "initial_release_date": "2026-05-21T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/rds: handle zerocopy send cleanup before the message is queued",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43502.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:19:38Z",
      "cve": "CVE-2026-43502",
      "id": "CVE-2026-43502",
      "initial_release_date": "2026-05-22T02:20:01Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "538",
      "product_status:known_not_affected": "67",
      "product_status:recommended": "269",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43502",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43502.json",
      "version": "13"
    }
  }
}



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Taxonomy of the tags.





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.