{ "cveId": "CVE-2025-39758", "url": "https://patchblox.com/security/cve/CVE-2025-39758", "summary": "CVE-2025-39758 is fixed in 24 products on 1 platform, first by DEBIAN-CVE-2025-39758, released September 11, 2025. It is not reported as exploited. Patch Radar priority: Routine.", "title": "RDMA/siw: Fix the sendmsg byte count in siw_tcp_sendpages", "description": "In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix the sendmsg byte count in siw_tcp_sendpages Ever since commit c2ff29e99a76 (\u0022siw: Inline do_tcp_sendpages()\u0022), we have been doing this: static int siw_tcp_sendpages(struct socket *s, struct page **page, int offset, size_t size) [...] /* Calculate the number of bytes we need to push, for this page * specifically */ size_t bytes = min_t(size_t, PAGE_SIZE - offset, size); /* If we can\u0027t splice it, then copy it in, as normal */ if (!sendpage_ok(page[i])) msg.msg_flags \u0026= ~MSG_SPLICE_PAGES; /* Set the bvec pointing to the page, with len $bytes */ bvec_set_page(\u0026bvec, page[i], bytes, offset); /* Set the iter to $size, aka the size of the whole sendpages (!!!) */ iov_iter_bvec(\u0026msg.msg_iter, ITER_SOURCE, \u0026bvec, 1, size); try_page_again: lock_sock(sk); /* Sendmsg with $size size (!!!) */ rv = tcp_sendmsg_locked(sk, \u0026msg, size); This means we\u0027ve been sending oversized iov_iters and tcp_sendmsg calls for a while. This has a been a benign bug because sendpage_ok() always returned true. With the recent slab allocator changes being slowly introduced into next (that disallow sendpage on large kmalloc allocations), we have recently hit out-of-bounds crashes, due to slight differences in iov_iter behavior between the MSG_SPLICE_PAGES and \u0022regular\u0022 copy paths: (MSG_SPLICE_PAGES) skb_splice_from_iter iov_iter_extract_pages iov_iter_extract_bvec_pages uses i-\u003Enr_segs to correctly stop in its tracks before OoB\u0027ing everywhere skb_splice_from_iter gets a \u0022short\u0022 read (!MSG_SPLICE_PAGES) skb_copy_to_page_nocache copy=iov_iter_count [...] copy_from_iter /* this doesn\u0027t help */ if (unlikely(iter-\u003Ecount \u003C len)) len = iter-\u003Ecount; iterate_bvec ... and we run off the bvecs Fix this by properly setting the iov_iter\u0027s byte count, plus sending the correct byte count to tcp_sendmsg_locked.", "published": "2025-09-11T17:15:39Z", "severity": "Moderate", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00417, "epssPercentile": 0.36239, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39758", "fixes": [ { "platform": "linux", "product": "dtb-aarch64", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.23.73.1", "fix": "SUSE-SU-2025:03600-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-03600-1", "released": "2025-10-15T12:54:53Z" }, { "platform": "linux", "product": "dtb-aarch64", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.6.1", "fix": "OPENSUSE-SU-2025:20081-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20081-1", "released": "2025-11-25T07:35:00Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "opensuse-leap 15.6", "fixedVersion": "6.4.0-150600.23.73.1", "fix": "SUSE-SU-2025:03600-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2025-03600-1", 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