CVE-2026-19595

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CVE-2026-19595

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cve id

CVE-2026-19595

published

2026-10-19T23:17:36.717

last modified

2026-10-19T23:17:36.717

status

Received

description

The user-mode syscall verifier z_vrfy_rtio_cqe_get_mempool_buffer() in subsys/rtio/rtio_syscalls.c validated its two output parameters, buff and buff_len, with K_SYSCALL_MEMORY_READ() rather than K_SYSCALL_MEMORY_WRITE(). Both are pure out-parameters: z_impl_rtio_cqe_get_mempool_buffer() stores the mempool buffer address and its length through them. The distinction is enforced by every architecture validator — arch_buffer_validate() on RISC-V PMP explicitly accepts the global __rom_region/__rodata_region for reads only, and the ARM MPU validators accept P_RO_U_RO and P_RW_U_RO regions for reads only — so a read-validated pointer is not necessarily writable by the calling thread. An unprivileged user-mode thread that has been granted access to an RTIO context (rtio_access_grant()) can invoke the rtio_cqe_get_mempool_buffer() syscall with buff/buff_len pointing at memory it may read but not write, and with a completion-queue entry whose flags field it fully controls (only RTIO_CQE_FLAG_MEMPOOL_BUFFER in flags[7:0] is required; flags[19:8] and flags[31:20] supply the block index and count). The kernel then performs a pointer-sized and a 4-byte store through those addresses while runn

cvss score

6.1

cvss severity

MEDIUM

cvss vector

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

cwes

CWE-787|CWE-822

cpe count

0

Verify at NIST National Vulnerability Database ↗

Cite this record

CVE-2026-19595 — MEDIUM. NIST, via Voidly Atlas — Surveillance & Digital-Rights Watch. Retrieved 2026-10-20, https://voidly.ai/atlas/federal/nvd-cves/CVE-2026-19595

@misc{voidly_nvd_cves_CVE202619595,
  title        = {CVE-2026-19595 — MEDIUM},
  author       = {{Voidly}},
  howpublished = {\url{https://voidly.ai/atlas/federal/nvd-cves/CVE-2026-19595}},
  note         = {Source: NIST National Vulnerability Database, https://nvd.nist.gov/vuln/detail/CVE-2026-19595. Public domain (17 U.S.C. §105); re-surfaced under CC BY 4.0},
  urldate      = {2026-10-20},
  year         = {2026}
}

Also available as JSON/BibTeX/APA: API record. Source data is U.S. federal public domain (17 U.S.C. §105). Re-surfaced by Voidly under CC BY 4.0.