{"id":"CVE-2024-26640","summary":"tcp: add sanity checks to rx zerocopy","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: add sanity checks to rx zerocopy\n\nTCP rx zerocopy intent is to map pages initially allocated\nfrom NIC drivers, not pages owned by a fs.\n\nThis patch adds to can_map_frag() these additional checks:\n\n- Page must not be a compound one.\n- page-\u003emapping must be NULL.\n\nThis fixes the panic reported by ZhangPeng.\n\nsyzbot was able to loopback packets built with sendfile(),\nmapping pages owned by an ext4 file to TCP rx zerocopy.\n\nr3 = socket$inet_tcp(0x2, 0x1, 0x0)\nmmap(&(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x0, 0x12, r3, 0x0)\nr4 = socket$inet_tcp(0x2, 0x1, 0x0)\nbind$inet(r4, &(0x7f0000000000)={0x2, 0x4e24, @multicast1}, 0x10)\nconnect$inet(r4, &(0x7f00000006c0)={0x2, 0x4e24, @empty}, 0x10)\nr5 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\\x00',\n    0x181e42, 0x0)\nfallocate(r5, 0x0, 0x0, 0x85b8)\nsendfile(r4, r5, 0x0, 0x8ba0)\ngetsockopt$inet_tcp_TCP_ZEROCOPY_RECEIVE(r4, 0x6, 0x23,\n    &(0x7f00000001c0)={&(0x7f0000ffb000/0x3000)=nil, 0x3000, 0x0, 0x0, 0x0,\n    0x0, 0x0, 0x0, 0x0}, &(0x7f0000000440)=0x40)\nr6 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\\x00',\n    0x181e42, 0x0)","modified":"2026-04-02T10:05:12.550341Z","published":"2024-03-18T10:19:07.025Z","related":["ALSA-2024:5102","ALSA-2024:8617","SUSE-SU-2024:3551-1","SUSE-SU-2024:3561-1","SUSE-SU-2024:3564-1","SUSE-SU-2024:3569-1","SUSE-SU-2024:3587-1","SUSE-SU-2024:3592-1","SUSE-SU-2025:20073-1","SUSE-SU-2025:20077-1","USN-6818-2","USN-6819-2"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26640.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1b8adcc0e2c584fec778add7777fe28e20781e60"},{"type":"WEB","url":"https://git.kernel.org/stable/c/577e4432f3ac810049cb7e6b71f4d96ec7c6e894"},{"type":"WEB","url":"https://git.kernel.org/stable/c/718f446e60316bf606946f7f42367d691d21541e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b383d4ea272fe5795877506dcce5aad1f6330e5e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d15cc0f66884ef2bed28c7ccbb11c102aa3a0760"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f48bf9a83b1666d934247cb58a9887d7b3127b6f"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26640.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26640"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"93ab6cc69162775201587cc9da00d5016dc890e2"},{"fixed":"f48bf9a83b1666d934247cb58a9887d7b3127b6f"},{"fixed":"718f446e60316bf606946f7f42367d691d21541e"},{"fixed":"b383d4ea272fe5795877506dcce5aad1f6330e5e"},{"fixed":"d15cc0f66884ef2bed28c7ccbb11c102aa3a0760"},{"fixed":"1b8adcc0e2c584fec778add7777fe28e20781e60"},{"fixed":"577e4432f3ac810049cb7e6b71f4d96ec7c6e894"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26640.json"}}],"schema_version":"1.7.5"}