{"affected":[],"cveId":"CVE-2026-64550","cwes":[],"description":"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->len, 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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.3,"severity":"high","source":"NVD: 416baaa9-dc9f-4396-8d5f-8c081fb06d67","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H","version":"3.1"}],"modifiedAt":1793729739353,"publishedAt":1785187027867,"references":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/00f4c366dbca16a40772c3b7ec2d8cba839e9724"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/14eb0c9491385d5361a292ea4974aec0e6887299"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/1b12612c367e4be9b0814c0468e7e687835315b4"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/231a8a4b76cb1b1827b3b19d7b3603642f5aaaef"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/3868c3244369ab709a90c9aad7534d406009b824"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/a54d76d176e50d2fdbd39b7231efe256170339e4"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/ed25befc8c36f896b5878f9078faddb67fd7e2d0"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/f0f1887a9e30712a1df03e152dce6fb91344b1f3"}],"remediation":[],"revision":"652b7140d8c67b10a5827b369b237c190459d121e795d8b38c64bed85e932bdd","sources":[{"modifiedAt":1793729739353,"name":"NVD","retrievedAt":1793729783965,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64550"}],"ssvc":null,"status":"published","title":"CVE-2026-64550","updatedAt":1793729783965}