{"id":"CVE-2026-64550","summary":"net: qualcomm: rmnet: validate MAP frame length before ingress parsing","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: validate MAP frame length before ingress parsing\n\nWhen ingress deaggregation is disabled, rmnet_map_ingress_handler() passes\nthe skb straight to __rmnet_map_ingress_handler(), skipping the length\nvalidation that rmnet_map_deaggregate() performs on the aggregated path.\nThe parser then dereferences the MAP header and csum header/trailer based on\nthe on-wire pkt_len without checking skb-\u003elen, so a short frame is read out\nof bounds:\n\n  BUG: KASAN: slab-out-of-bounds in rmnet_map_checksum_downlink_packet\n  Read of size 1 at addr ffff88801118ed00 by task exploit/147\n  Call Trace:\n   ...\n   rmnet_map_checksum_downlink_packet (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:413)\n   __rmnet_map_ingress_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:96)\n   rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:129)\n   __netif_receive_skb_core.constprop.0 (net/core/dev.c:6089)\n   netif_receive_skb (net/core/dev.c:6460)\n   tun_get_user (drivers/net/tun.c:1955)\n   tun_chr_write_iter (drivers/net/tun.c:2001)\n   vfs_write (fs/read_write.c:688)\n   ksys_write (fs/read_write.c:740)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   ...\n\nFactor that validation out of rmnet_map_deaggregate() into\nrmnet_map_validate_packet_len() and run it on the no-aggregation path too.\nThe MAP header is bounds-checked first, since this path can receive a frame\nshorter than the header.","modified":"2026-07-29T03:31:43.052593313Z","published":"2026-07-27T20:10:39.459Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64550.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/00f4c366dbca16a40772c3b7ec2d8cba839e9724"},{"type":"WEB","url":"https://git.kernel.org/stable/c/14eb0c9491385d5361a292ea4974aec0e6887299"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1b12612c367e4be9b0814c0468e7e687835315b4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/231a8a4b76cb1b1827b3b19d7b3603642f5aaaef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3868c3244369ab709a90c9aad7534d406009b824"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a54d76d176e50d2fdbd39b7231efe256170339e4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed25befc8c36f896b5878f9078faddb67fd7e2d0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f0f1887a9e30712a1df03e152dce6fb91344b1f3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64550.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64550"},{"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":"ceed73a2cf4aff2921802aa3d21d45280677547d"},{"fixed":"ed25befc8c36f896b5878f9078faddb67fd7e2d0"},{"fixed":"a54d76d176e50d2fdbd39b7231efe256170339e4"},{"fixed":"00f4c366dbca16a40772c3b7ec2d8cba839e9724"},{"fixed":"3868c3244369ab709a90c9aad7534d406009b824"},{"fixed":"14eb0c9491385d5361a292ea4974aec0e6887299"},{"fixed":"1b12612c367e4be9b0814c0468e7e687835315b4"},{"fixed":"231a8a4b76cb1b1827b3b19d7b3603642f5aaaef"},{"fixed":"f0f1887a9e30712a1df03e152dce6fb91344b1f3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64550.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.14.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64550.json"}}],"schema_version":"1.7.5"}