{"id":"CVE-2023-53726","title":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: csum: Fix OoB access in IP checksum code for negative lengths\n\nAlthough commit c2c24edb1d9c (\"arm64: csum: Fix pathological zero-length\ncalls\") added an early re…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: csum: Fix OoB access in IP checksum code for negative lengths\n\nAlthough commit c2c24edb1d9c (\"arm64: csum: Fix pathological zero-length\ncalls\") added an early re…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 5777eaed566a1d63e344d3dd8f2b5e33be20643e < 5a85727239a23de1cc8d93985f1056308128f3e2","Linux >= 5777eaed566a1d63e344d3dd8f2b5e33be20643e < 9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523","Linux >= 5777eaed566a1d63e344d3dd8f2b5e33be20643e < ba0b46166b8e547024d02345a68b747841931ad2","Linux >= 5777eaed566a1d63e344d3dd8f2b5e33be20643e < a5ad2f87d8e74e351d3f500ad9d5b3a5653e1c6f","Linux >= 5777eaed566a1d63e344d3dd8f2b5e33be20643e < fcdf904e866de0e3715835e50409fda3b2590527","Linux >= 5777eaed566a1d63e344d3dd8f2b5e33be20643e < 8bd795fedb8450ecbef18eeadbd23ed8fc7630f5","Linux 5.6"],"published":"2025-10-22","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:47.430","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53726","references":[{"url":"https://git.kernel.org/stable/c/5a85727239a23de1cc8d93985f1056308128f3e2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8bd795fedb8450ecbef18eeadbd23ed8fc7630f5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a5ad2f87d8e74e351d3f500ad9d5b3a5653e1c6f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ba0b46166b8e547024d02345a68b747841931ad2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fcdf904e866de0e3715835e50409fda3b2590527","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.0015,"epssPercentile":0.04141,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T21:36:49.302091Z"},"ingestedAt":"2026-10-15T22:48:25.418Z","slug":"CVE-2023-53726","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\narm64: csum: Fix OoB access in IP checksum code for negative lengths\n\nAlthough commit c2c24edb1d9c (\"arm64: csum: Fix pathological zero-length\ncalls\") added an early return for zero-length input, syzkaller has\npopped up with an example of a _negative_ length which causes an\nundefined shift and an out-of-bounds read:\n\n | BUG: KASAN: slab-out-of-bounds in do_csum+0x44/0x254 arch/arm64/lib/csum.c:39\n | Read of size 4294966928 at addr ffff0000d7ac0170 by task syz-executor412/5975\n |\n | CPU: 0 PID: 5975 Comm: syz-executor412 Not tainted 6.4.0-rc4-syzkaller-g908f31f2a05b #0\n | Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023\n | Call trace:\n |  dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233\n |  show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240\n |  __dump_stack lib/dump_stack.c:88 [inline]\n |  dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106\n |  print_address_description mm/kasan/report.c:351 [inline]\n |  print_report+0x174/0x514 mm/kasan/report.c:462\n |  kasan_report+0xd4/0x130 mm/kasan/report.c:572\n |  kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187\n |  __kasan_check_read+0x20/0x30 mm/kasan/shadow.c:31\n |  do_csum+0x44/0x254 arch/arm64/lib/csum.c:39\n |  csum_partial+0x30/0x58 lib/checksum.c:128\n |  gso_make_checksum include/linux/skbuff.h:4928 [inline]\n |  __udp_gso_segment+0xaf4/0x1bc4 net/ipv4/udp_offload.c:332\n |  udp6_ufo_fragment+0x540/0xca0 net/ipv6/udp_offload.c:47\n |  ipv6_gso_segment+0x5cc/0x1760 net/ipv6/ip6_offload.c:119\n |  skb_mac_gso_segment+0x2b4/0x5b0 net/core/gro.c:141\n |  __skb_gso_segment+0x250/0x3d0 net/core/dev.c:3401\n |  skb_gso_segment include/linux/netdevice.h:4859 [inline]\n |  validate_xmit_skb+0x364/0xdbc net/core/dev.c:3659\n |  validate_xmit_skb_list+0x94/0x130 net/core/dev.c:3709\n |  sch_direct_xmit+0xe8/0x548 net/sched/sch_generic.c:327\n |  __dev_xmit_skb net/core/dev.c:3805 [inline]\n |  __dev_queue_xmit+0x147c/0x3318 net/core/dev.c:4210\n |  dev_queue_xmit include/linux/netdevice.h:3085 [inline]\n |  packet_xmit+0x6c/0x318 net/packet/af_packet.c:276\n |  packet_snd net/packet/af_packet.c:3081 [inline]\n |  packet_sendmsg+0x376c/0x4c98 net/packet/af_packet.c:3113\n |  sock_sendmsg_nosec net/socket.c:724 [inline]\n |  sock_sendmsg net/socket.c:747 [inline]\n |  __sys_sendto+0x3b4/0x538 net/socket.c:2144\n\nExtend the early return to reject negative lengths as well, aligning our\nimplementation with the generic code in lib/checksum.c\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}