{"id":"CVE-2023-53726","revision":null,"records":[{"revision":"923a58e1a1a04c7185cb14b30c4bfa92","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-53726","aliases":[],"title":"arm64: csum: Fix OoB access in IP checksum code for negative lengths","description":"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 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","state":0,"publishedAt":"2025-10-22T13:23:55.896+00:00","modifiedAt":"2026-10-15T21:41:34.644+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"arch/arm64/lib/csum.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\n \"lessThan\": \"5a85727239a23de1cc8d93985f1056308128f3e2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\n \"lessThan\": \"9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\n \"lessThan\": \"ba0b46166b8e547024d02345a68b747841931ad2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\n \"lessThan\": \"a5ad2f87d8e74e351d3f500ad9d5b3a5653e1c6f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\n \"lessThan\": \"fcdf904e866de0e3715835e50409fda3b2590527\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5777eaed566a1d63e344d3dd8f2b5e33be20643e\",\n \"lessThan\": \"8bd795fedb8450ecbef18eeadbd23ed8fc7630f5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"arch/arm64/lib/csum.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.6\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.6\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.195\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.132\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.53\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.4.16\",\n \"lessThanOrEqual\": \"6.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.5.3\",\n \"lessThanOrEqual\": \"6.5.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/5a85727239a23de1cc8d93985f1056308128f3e2","https://git.kernel.org/stable/c/9a43563cfd6b9200ff2f76b3f9fcdcb217ceb523","https://git.kernel.org/stable/c/ba0b46166b8e547024d02345a68b747841931ad2","https://git.kernel.org/stable/c/a5ad2f87d8e74e351d3f500ad9d5b3a5653e1c6f","https://git.kernel.org/stable/c/fcdf904e866de0e3715835e50409fda3b2590527","https://git.kernel.org/stable/c/8bd795fedb8450ecbef18eeadbd23ed8fc7630f5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53726","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-53726","identifiers":["CVE-2023-53726"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EPSS backfill.","generation":"2026-11-09T13:04:36.1502744+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T13:04:36.1502744+00:00","lastSuccessAt":"2026-11-09T13:04:36.3096956+00:00","error":null,"lastVerifiedAt":"2026-11-09T13:04:36.3096959+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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