{"id":"CVE-2025-21734","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix copy buffer page size\n\nFor non-registered buffer, fastrpc driver copies the buffer and\npass it to the remote subsystem","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix copy buffer page size\n\nFor non-registered buffer, fastrpc driver copies the buffer and\npass it to the remote subsystem. There is a problem with curre…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-787"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.2, < 6.1.129","linux_kernel >= 6.2, < 6.6.78","linux_kernel >= 6.7, < 6.12.14","linux_kernel >= 6.13, < 6.13.3"],"patched":["linux_kernel 6.13.3"],"published":"2025-02-27","updated":"2026-07-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-21734","references":[{"url":"https://git.kernel.org/stable/c/24a79c6bc8de763f7c50f4f84f8b0c183bc25a51","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c0464bad0e85fcd5d47e4297d1e410097c979e55","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c3f7161123fcbdc64e90119ccce292d8b66281c4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c56ba3ea8e3c9a69a992aad18f7a65e43e51d623","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e966eae72762ecfdbdb82627e2cda48845b9dd66","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00206,"epssPercentile":0.10916,"ingestedAt":"2026-07-30T06:53:09.541Z","slug":"CVE-2025-21734","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix copy buffer page size\n\nFor non-registered buffer, fastrpc driver copies the buffer and\npass it to the remote subsystem. There is a problem with current\nimplementation of page size calculation which is not considering\nthe offset in the calculation. This might lead to passing of\nimproper and out-of-bounds page size which could result in\nmemory issue. Calculate page start and page end using the offset\nadjusted address instead of absolute address.\n\n## Affected\n\n- `linux_kernel >= 5.2, < 6.1.129`\n- `linux_kernel >= 6.2, < 6.6.78`\n- `linux_kernel >= 6.7, < 6.12.14`\n- `linux_kernel >= 6.13, < 6.13.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.13.3`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}