CVE-2024-38578 (GCVE-0-2024-38578)

Vulnerability from cvelistv5 – Published: 2024-06-19 13:37 – Updated: 2026-08-05 11:32
VLAI
Title
ecryptfs: Fix buffer size for tag 66 packet
Summary
In the Linux kernel, the following vulnerability has been resolved: ecryptfs: Fix buffer size for tag 66 packet The 'TAG 66 Packet Format' description is missing the cipher code and checksum fields that are packed into the message packet. As a result, the buffer allocated for the packet is 3 bytes too small and write_tag_66_packet() will write up to 3 bytes past the end of the buffer. Fix this by increasing the size of the allocation so the whole packet will always fit in the buffer. This fixes the below kasan slab-out-of-bounds bug: BUG: KASAN: slab-out-of-bounds in ecryptfs_generate_key_packet_set+0x7d6/0xde0 Write of size 1 at addr ffff88800afbb2a5 by task touch/181 CPU: 0 PID: 181 Comm: touch Not tainted 6.6.13-gnu #1 4c9534092be820851bb687b82d1f92a426598dc6 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2/GNU Guix 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x4c/0x70 print_report+0xc5/0x610 ? ecryptfs_generate_key_packet_set+0x7d6/0xde0 ? kasan_complete_mode_report_info+0x44/0x210 ? ecryptfs_generate_key_packet_set+0x7d6/0xde0 kasan_report+0xc2/0x110 ? ecryptfs_generate_key_packet_set+0x7d6/0xde0 __asan_store1+0x62/0x80 ecryptfs_generate_key_packet_set+0x7d6/0xde0 ? __pfx_ecryptfs_generate_key_packet_set+0x10/0x10 ? __alloc_pages+0x2e2/0x540 ? __pfx_ovl_open+0x10/0x10 [overlay 30837f11141636a8e1793533a02e6e2e885dad1d] ? dentry_open+0x8f/0xd0 ecryptfs_write_metadata+0x30a/0x550 ? __pfx_ecryptfs_write_metadata+0x10/0x10 ? ecryptfs_get_lower_file+0x6b/0x190 ecryptfs_initialize_file+0x77/0x150 ecryptfs_create+0x1c2/0x2f0 path_openat+0x17cf/0x1ba0 ? __pfx_path_openat+0x10/0x10 do_filp_open+0x15e/0x290 ? __pfx_do_filp_open+0x10/0x10 ? __kasan_check_write+0x18/0x30 ? _raw_spin_lock+0x86/0xf0 ? __pfx__raw_spin_lock+0x10/0x10 ? __kasan_check_write+0x18/0x30 ? alloc_fd+0xf4/0x330 do_sys_openat2+0x122/0x160 ? __pfx_do_sys_openat2+0x10/0x10 __x64_sys_openat+0xef/0x170 ? __pfx___x64_sys_openat+0x10/0x10 do_syscall_64+0x60/0xd0 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 RIP: 0033:0x7f00a703fd67 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 RSP: 002b:00007ffc088e30b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007ffc088e3368 RCX: 00007f00a703fd67 RDX: 0000000000000941 RSI: 00007ffc088e48d7 RDI: 00000000ffffff9c RBP: 00007ffc088e48d7 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000941 R13: 0000000000000000 R14: 00007ffc088e48d7 R15: 00007f00a7180040 </TASK> Allocated by task 181: kasan_save_stack+0x2f/0x60 kasan_set_track+0x29/0x40 kasan_save_alloc_info+0x25/0x40 __kasan_kmalloc+0xc5/0xd0 __kmalloc+0x66/0x160 ecryptfs_generate_key_packet_set+0x6d2/0xde0 ecryptfs_write_metadata+0x30a/0x550 ecryptfs_initialize_file+0x77/0x150 ecryptfs_create+0x1c2/0x2f0 path_openat+0x17cf/0x1ba0 do_filp_open+0x15e/0x290 do_sys_openat2+0x122/0x160 __x64_sys_openat+0xef/0x170 do_syscall_64+0x60/0xd0 entry_SYSCALL_64_after_hwframe+0x6e/0xd8
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:14 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < 1c125b9287e58f364d82174efb167414b92b11f1 (git)
Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < 235b85981051cd68fc215fd32a81c6f116bfc4df (git)
Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < edbfc42ab080e78c6907d40a42c9d10b69e445c1 (git)
Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < 12db25a54ce6bb22b0af28010fff53ef9cb3fe93 (git)
Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < 0d0f8ba042af16519f1ef7dd10463a33b21b677c (git)
Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < 2ed750b7ae1b5dc72896d7dd114c419afd3d1910 (git)
Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < a20f09452e2f58f761d11ad7b96b5c894c91030e (git)
Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < f6008487f1eeb8693f8d2a36a89c87d9122ddf74 (git)
Affected: dddfa461fc8951f9b5f951c13565b6cac678635a , < 85a6a1aff08ec9f5b929d345d066e2830e8818e5 (git)
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Linux Linux Affected: 2.6.21
Unaffected: 0 , < 2.6.21 (semver)
Unaffected: 4.19.316 , ≤ 4.19.* (semver)
Unaffected: 5.4.278 , ≤ 5.4.* (semver)
Unaffected: 5.10.219 , ≤ 5.10.* (semver)
Unaffected: 5.15.161 , ≤ 5.15.* (semver)
Unaffected: 6.1.93 , ≤ 6.1.* (semver)
Unaffected: 6.6.33 , ≤ 6.6.* (semver)
Unaffected: 6.8.12 , ≤ 6.8.* (semver)
Unaffected: 6.9.3 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
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Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.1 (custom)
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Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Unaffected: 0 , < * (custom)
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Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.1 (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: Fix buffer size for tag 66 packet\n\nThe \u0027TAG 66 Packet Format\u0027 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   \u003cTASK\u003e\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 \u003c48\u003e 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   \u003c/TASK\u003e\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"
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          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The overflow is reached through a local `openat(O_CREAT)` syscall against a file in an eCryptfs mount; no network or remote peer data is involved.\nAC:L - The out-of-bounds write occurs deterministically on every file creation once the auth token is of private-key type, and the attacker chooses the allocation size via the `ecryptfs_key_bytes=`/`cipher=` mount options so the stray byte lands exactly on an adjacent kmalloc-32/kmalloc-64 object; no uncontrolled precondition or race is involved.\nPR:L - An unprivileged local user reaches this on standard eCryptfs deployments (ecryptfs-utils\u0027 setuid-root `mount.ecryptfs_private`, encrypted home/Private dirs), since the auth-token payload is a user-owned `key_type_user` key re-read on every file creation and `token_type` can be set to `ECRYPTFS_PRIVATE_KEY` by the user themselves.\nUI:N - The attacker performs the entire sequence (key setup, mount of their own private directory, file creation) with no action by any other user; the mount is already present in the normal per-user encrypted-home scenario.\nS:U - The heap corruption stays within the kernel\u0027s own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The overflow corrupts the first byte of a neighbouring slab object, which can be groomed to be a length/index/pointer field, converting the bug into an out-of-bounds read primitive and disclosure of arbitrary kernel memory.\nI:H - This is a heap out-of-bounds write into an adjacent slab allocation with attacker-controlled allocation size and brute-forceable byte value \u2014 a classic single-byte heap corruption primitive leading to control-flow hijack or privilege escalation.\nA:H - Corrupting adjacent slab metadata or object state readily produces kernel oops/panic, and the write is triggerable on every file creation, so the system can be crashed repeatedly at will."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1c125b9287e58f364d82174efb167414b92b11f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/235b85981051cd68fc215fd32a81c6f116bfc4df"
        },
        {
          "url": "https://git.kernel.org/stable/c/edbfc42ab080e78c6907d40a42c9d10b69e445c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/12db25a54ce6bb22b0af28010fff53ef9cb3fe93"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d0f8ba042af16519f1ef7dd10463a33b21b677c"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ed750b7ae1b5dc72896d7dd114c419afd3d1910"
        },
        {
          "url": "https://git.kernel.org/stable/c/a20f09452e2f58f761d11ad7b96b5c894c91030e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6008487f1eeb8693f8d2a36a89c87d9122ddf74"
        },
        {
          "url": "https://git.kernel.org/stable/c/85a6a1aff08ec9f5b929d345d066e2830e8818e5"
        }
      ],
      "title": "ecryptfs: Fix buffer size for tag 66 packet",
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    "cveId": "CVE-2024-38578",
    "datePublished": "2024-06-19T13:37:36.487Z",
    "dateReserved": "2024-06-18T19:36:34.926Z",
    "dateUpdated": "2026-08-05T11:32:55.740Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: Fix buffer size for tag 66 packet\n\nThe \u0027TAG 66 Packet Format\u0027 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   \u003cTASK\u003e\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 \u003c48\u003e 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   \u003c/TASK\u003e\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"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ecryptfs: corrige el tama\u00f1o del b\u00fafer para el paquete etiqueta 66. A la descripci\u00f3n \u0027Formato de paquete TAG 66\u0027 le faltan el c\u00f3digo de cifrado y los campos de suma de verificaci\u00f3n que est\u00e1n empaquetados en el paquete de mensaje. Como resultado, el b\u00fafer asignado para el paquete es 3 bytes demasiado peque\u00f1o y write_tag_66_packet() escribir\u00e1 hasta 3 bytes m\u00e1s all\u00e1 del final del b\u00fafer. Solucione este problema aumentando el tama\u00f1o de la asignaci\u00f3n para que todo el paquete siempre quepa en el b\u00fafer. Esto corrige el siguiente error de kasan slab-out-of-bounds: ERROR: KASAN: slab-out-of-bounds in ecryptfs_generate_key_packet_set+0x7d6/0xde0 Escritura de tama\u00f1o 1 en la direcci\u00f3n ffff88800afbb2a5 mediante tarea t\u00e1ctil/181 CPU: 0 PID: 181 Comm : touch No contaminado 6.6.13-gnu #1 4c9534092be820851bb687b82d1f92a426598dc6 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.16.2/GNU Guix 01/04/2014 Seguimiento de llamadas:  3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f RSP: 002b:00007ffc088e30b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX : ffffffffffffffda RBX: 00007ffc088e3368 RCX: 00007f00a703fd67 RDX: 0000000000000941 RSI: 00007ffc088e48d7 RDI: 00000000ffffff9c RBP: 00007ffc088e4 8d7 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000941 R13: 00000 R14: 00007ffc088e48d7 R15: 00007f00a7180040  Asignado por tarea 181: kasan_save_stack+0x2f/0x60 kasan_set_track+0x29/0x40 kasan_save_alloc_info+0x25/0x40 __kasan_kmalloc+0xc5/0xd0 __kmalloc+0x66/0x160 ecryptfs_generate_key_packet_set+0x6d2/0xde0 _write_metadata+0x30a/0x550 ecryptfs_initialize_file+0x77/0x150 ecryptfs_create+0x1c2/0x2f0 ruta_openat+ 0x17cf/0x1ba0 do_filp_open+0x15e/0x290 do_sys_openat2+0x122/0x160 __x64_sys_openat+0xef/0x170 do_syscall_64+0x60/0xd0 Entry_SYSCALL_64_after_hwframe+0x6e/0xd8"
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                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.9.3",
                      "versionStartIncluding": "2.6.21",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.10",
                      "versionStartIncluding": "2.6.21",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: Fix buffer size for tag 66 packet\n\nThe \u0027TAG 66 Packet Format\u0027 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   \u003cTASK\u003e\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 \u003c48\u003e 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   \u003c/TASK\u003e\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"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The overflow is reached through a local `openat(O_CREAT)` syscall against a file in an eCryptfs mount; no network or remote peer data is involved.\nAC:L - The out-of-bounds write occurs deterministically on every file creation once the auth token is of private-key type, and the attacker chooses the allocation size via the `ecryptfs_key_bytes=`/`cipher=` mount options so the stray byte lands exactly on an adjacent kmalloc-32/kmalloc-64 object; no uncontrolled precondition or race is involved.\nPR:L - An unprivileged local user reaches this on standard eCryptfs deployments (ecryptfs-utils\u0027 setuid-root `mount.ecryptfs_private`, encrypted home/Private dirs), since the auth-token payload is a user-owned `key_type_user` key re-read on every file creation and `token_type` can be set to `ECRYPTFS_PRIVATE_KEY` by the user themselves.\nUI:N - The attacker performs the entire sequence (key setup, mount of their own private directory, file creation) with no action by any other user; the mount is already present in the normal per-user encrypted-home scenario.\nS:U - The heap corruption stays within the kernel\u0027s own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The overflow corrupts the first byte of a neighbouring slab object, which can be groomed to be a length/index/pointer field, converting the bug into an out-of-bounds read primitive and disclosure of arbitrary kernel memory.\nI:H - This is a heap out-of-bounds write into an adjacent slab allocation with attacker-controlled allocation size and brute-forceable byte value \u2014 a classic single-byte heap corruption primitive leading to control-flow hijack or privilege escalation.\nA:H - Corrupting adjacent slab metadata or object state readily produces kernel oops/panic, and the write is triggerable on every file creation, so the system can be crashed repeatedly at will."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:32:55.740Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/1c125b9287e58f364d82174efb167414b92b11f1"
            },
            {
              "url": "https://git.kernel.org/stable/c/235b85981051cd68fc215fd32a81c6f116bfc4df"
            },
            {
              "url": "https://git.kernel.org/stable/c/edbfc42ab080e78c6907d40a42c9d10b69e445c1"
            },
            {
              "url": "https://git.kernel.org/stable/c/12db25a54ce6bb22b0af28010fff53ef9cb3fe93"
            },
            {
              "url": "https://git.kernel.org/stable/c/0d0f8ba042af16519f1ef7dd10463a33b21b677c"
            },
            {
              "url": "https://git.kernel.org/stable/c/2ed750b7ae1b5dc72896d7dd114c419afd3d1910"
            },
            {
              "url": "https://git.kernel.org/stable/c/a20f09452e2f58f761d11ad7b96b5c894c91030e"
            },
            {
              "url": "https://git.kernel.org/stable/c/f6008487f1eeb8693f8d2a36a89c87d9122ddf74"
            },
            {
              "url": "https://git.kernel.org/stable/c/85a6a1aff08ec9f5b929d345d066e2830e8818e5"
            }
          ],
          "title": "ecryptfs: Fix buffer size for tag 66 packet",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-38578",
        "datePublished": "2024-06-19T13:37:36.487Z",
        "dateReserved": "2024-06-18T19:36:34.926Z",
        "dateUpdated": "2026-08-05T11:32:55.740Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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