{"cve":"CVE-2024-38578","nvd":{"published":"2024-06-19T14:15:17.870","modified":"2026-10-15T01:18:29.647","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: Fix buffer size for tag 66 packet\n\nThe 'TAG 66 Packet Format' description is missing the cipher code and\nchecksum fields that are packed into the message packet. As a result,\nthe buffer allocated for the packet is 3 bytes too small and\nwrite_tag_66_packet() will write up to 3 bytes past the end of the\nbuffer.\n\nFix this by increasing the size of the allocation so the whole packet\nwill always fit in the buffer.\n\nThis fixes the below kasan slab-out-of-bounds bug:\n\n  BUG: KASAN: slab-out-of-bounds in ecryptfs_generate_key_packet_set+0x7d6/0xde0\n  Write of size 1 at addr ffff88800afbb2a5 by task touch/181\n\n  CPU: 0 PID: 181 Comm: touch Not tainted 6.6.13-gnu #1 4c9534092be820851bb687b82d1f92a426598dc6\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2/GNU Guix 04/01/2014\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x4c/0x70\n   print_report+0xc5/0x610\n   ? ecryptfs_generate_key_packet_set+0x7d6/0xde0\n   ? kasan_complete_mode_report_info+0x44/0x210\n   ? ecryptfs_generate_key_packet_set+0x7d6/0xde0\n   kasan_report+0xc2/0x110\n   ? ecryptfs_generate_key_packet_set+0x7d6/0xde0\n   __asan_store1+0x62/0x80\n   ecryptfs_generate_key_packet_set+0x7d6/0xde0\n   ? __pfx_ecryptfs_generate_key_packet_set+0x10/0x10\n   ? __alloc_pages+0x2e2/0x540\n   ? __pfx_ovl_open+0x10/0x10 [overlay 30837f11141636a8e1793533a02e6e2e885dad1d]\n   ? dentry_open+0x8f/0xd0\n   ecryptfs_write_metadata+0x30a/0x550\n   ? __pfx_ecryptfs_write_metadata+0x10/0x10\n   ? ecryptfs_get_lower_file+0x6b/0x190\n   ecryptfs_initialize_file+0x77/0x150\n   ecryptfs_create+0x1c2/0x2f0\n   path_openat+0x17cf/0x1ba0\n   ? __pfx_path_openat+0x10/0x10\n   do_filp_open+0x15e/0x290\n   ? __pfx_do_filp_open+0x10/0x10\n   ? __kasan_check_write+0x18/0x30\n   ? _raw_spin_lock+0x86/0xf0\n   ? __pfx__raw_spin_lock+0x10/0x10\n   ? __kasan_check_write+0x18/0x30\n   ? alloc_fd+0xf4/0x330\n   do_sys_openat2+0x122/0x160\n   ? __pfx_do_sys_openat2+0x10/0x10\n   __x64_sys_openat+0xef/0x170\n   ? __pfx___x64_sys_openat+0x10/0x10\n   do_syscall_64+0x60/0xd0\n   entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n  RIP: 0033:0x7f00a703fd67\n  Code: 25 00 00 41 00 3d 00 00 41 00 74 37 64 8b 04 25 18 00 00 00 85 c0 75 5b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f\n  RSP: 002b:00007ffc088e30b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101\n  RAX: ffffffffffffffda RBX: 00007ffc088e3368 RCX: 00007f00a703fd67\n  RDX: 0000000000000941 RSI: 00007ffc088e48d7 RDI: 00000000ffffff9c\n  RBP: 00007ffc088e48d7 R08: 0000000000000001 R09: 0000000000000000\n  R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000941\n  R13: 0000000000000000 R14: 00007ffc088e48d7 R15: 00007f00a7180040\n   </TASK>\n\n  Allocated by task 181:\n   kasan_save_stack+0x2f/0x60\n   kasan_set_track+0x29/0x40\n   kasan_save_alloc_info+0x25/0x40\n   __kasan_kmalloc+0xc5/0xd0\n   __kmalloc+0x66/0x160\n   ecryptfs_generate_key_packet_set+0x6d2/0xde0\n   ecryptfs_write_metadata+0x30a/0x550\n   ecryptfs_initialize_file+0x77/0x150\n   ecryptfs_create+0x1c2/0x2f0\n   path_openat+0x17cf/0x1ba0\n   do_filp_open+0x15e/0x290\n   do_sys_openat2+0x122/0x160\n   __x64_sys_openat+0xef/0x170\n   do_syscall_64+0x60/0xd0\n   entry_SYSCALL_64_after_hwframe+0x6e/0xd8","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-787"],"references":["https://git.kernel.org/stable/c/0d0f8ba042af16519f1ef7dd10463a33b21b677c","https://git.kernel.org/stable/c/12db25a54ce6bb22b0af28010fff53ef9cb3fe93","https://git.kernel.org/stable/c/1c125b9287e58f364d82174efb167414b92b11f1","https://git.kernel.org/stable/c/235b85981051cd68fc215fd32a81c6f116bfc4df","https://git.kernel.org/stable/c/2ed750b7ae1b5dc72896d7dd114c419afd3d1910"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:00.836172422+00:00"},"epss":{"cve":"CVE-2024-38578","score":0.00263,"percentile":0.18008,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}