{"id":"DEBIAN-CVE-2023-52474","details":"In the Linux kernel, the following vulnerability has been resolved:  IB/hfi1: Fix bugs with non-PAGE_SIZE-end multi-iovec user SDMA requests  hfi1 user SDMA request processing has two bugs that can cause data corruption for user SDMA requests that have multiple payload iovecs where an iovec other than the tail iovec does not run up to the page boundary for the buffer pointed to by that iovec.a  Here are the specific bugs: 1. user_sdma_txadd() does not use struct user_sdma_iovec-\u003eiov.iov_len.    Rather, user_sdma_txadd() will add up to PAGE_SIZE bytes from iovec    to the packet, even if some of those bytes are past    iovec-\u003eiov.iov_len and are thus not intended to be in the packet. 2. user_sdma_txadd() and user_sdma_send_pkts() fail to advance to the    next iovec in user_sdma_request-\u003eiovs when the current iovec    is not PAGE_SIZE and does not contain enough data to complete the    packet. The transmitted packet will contain the wrong data from the    iovec pages.  This has not been an issue with SDMA packets from hfi1 Verbs or PSM2 because they only produce iovecs that end short of PAGE_SIZE as the tail iovec of an SDMA request.  Fixing these bugs exposes other bugs with the SDMA pin cache (struct mmu_rb_handler) that get in way of supporting user SDMA requests with multiple payload iovecs whose buffers do not end at PAGE_SIZE. So this commit fixes those issues as well.  Here are the mmu_rb_handler bugs that non-PAGE_SIZE-end multi-iovec payload user SDMA requests can hit: 1. Overlapping memory ranges in mmu_rb_handler will result in duplicate    pinnings. 2. When extending an existing mmu_rb_handler entry (struct mmu_rb_node),    the mmu_rb code (1) removes the existing entry under a lock, (2)    releases that lock, pins the new pages, (3) then reacquires the lock    to insert the extended mmu_rb_node.     If someone else comes in and inserts an overlapping entry between (2)    and (3), insert in (3) will fail.     The failure path code in this case unpins _all_ pages in either the    original mmu_rb_node or the new mmu_rb_node that was inserted between    (2) and (3). 3. In hfi1_mmu_rb_remove_unless_exact(), mmu_rb_node-\u003erefcount is    incremented outside of mmu_rb_handler-\u003elock. As a result, mmu_rb_node    could be evicted by another thread that gets mmu_rb_handler-\u003elock and    checks mmu_rb_node-\u003erefcount before mmu_rb_node-\u003erefcount is    incremented. 4. Related to #2 above, SDMA request submission failure path does not    check mmu_rb_node-\u003erefcount before freeing mmu_rb_node object.     If there are other SDMA requests in progress whose iovecs have    pointers to the now-freed mmu_rb_node(s), those pointers to the    now-freed mmu_rb nodes will be dereferenced when those SDMA requests    complete.","modified":"2026-09-15T09:02:47.660622722Z","published":"2024-02-26T18:15:07.237Z","upstream":["CVE-2023-52474"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-52474"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.37-1"}]}],"versions":["6.1.27-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52474.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.3.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52474.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.3.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52474.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}