243 lines
14 KiB
JSON
243 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64578",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.798Z",
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"datePublished": "2026-08-05T08:09:33.740Z",
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"dateUpdated": "2026-08-19T16:29:02.136Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-19T16:29:02.136Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate compound request size before reading StructureSize2\n\nWhen ksmbd validates a compound (chained) SMB2 request,\nksmbd_smb2_check_message() reads pdu->StructureSize2 without first\nchecking that the compound element is large enough to contain it.\nStructureSize2 is a 2-byte field at offset 64\n(__SMB2_HEADER_STRUCTURE_SIZE) from the start of each element.\n\nThe compound-walking logic only guarantees that a full 64-byte SMB2\nheader is present for the trailing element: when NextCommand is 0, len is\nreduced to the number of bytes remaining after next_smb2_rcv_hdr_off. A\nremote client can craft a compound request whose last element has exactly\n64 bytes, so the 2-byte StructureSize2 read at offset 64 extends one byte\npast the receive buffer, producing a slab-out-of-bounds read.\n\n BUG: KASAN: slab-out-of-bounds in ksmbd_smb2_check_message (fs/smb/server/smb2misc.c:402)\n Read of size 2 at addr ffff888012ae31ac by task kworker/0:1/14\n The buggy address is located 172 bytes inside of allocated 173-byte region\n Workqueue: ksmbd-io handle_ksmbd_work\n Call Trace:\n ...\n kasan_report (mm/kasan/report.c:595)\n ksmbd_smb2_check_message (fs/smb/server/smb2misc.c:402)\n handle_ksmbd_work (fs/smb/server/server.c:119)\n process_one_work (kernel/workqueue.c:3314)\n worker_thread (kernel/workqueue.c:3397)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:158)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n\nReject any compound element that is too small to hold StructureSize2\nbefore dereferencing it."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
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"baseScore": 8.2,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - ksmbd is an in-kernel SMB server reached over TCP/445; a remote client triggers the bug by sending a crafted compound SMB2 request that is processed in handle_ksmbd_work() → ksmbd_verify_smb_message() → ksmbd_smb2_check_message().\nAC:L - The attacker fully controls compound layout and can set the trailing element's remaining length to exactly 64 bytes so StructureSize2 is read one byte past the receive buffer; no race or attacker-uncontrollable condition is required.\nPR:N - On affected kernels before the compound SESSION_VALID check, a compound NtLmNegotiate SESSION_SETUP (pre-auth, no credentials) sets work->sess and the trailing element still reaches ksmbd_smb2_check_message(); guest/anonymous SESSION_SETUP likewise needs no host privileges.\nUI:N - Exploitation requires only attacker-sent SMB2 protocol traffic to a listening ksmbd service; no victim user action is needed.\nS:U - The out-of-bounds read and any resulting kernel impact occur in the host ksmbd/workqueue context and do not cross a VM, IOMMU, or other security-authority boundary.\nC:L - The flaw is a strictly bounded slab out-of-bounds read of one byte past the receive buffer (2-byte StructureSize2 at offset 64 when only 64 bytes remain); it may disclose adjacent slab contents but not an arbitrary read primitive.\nI:N - The bug only reads past the buffer for a StructureSize2 comparison; for a 64-byte trailing element every valid command size is then rejected, and there is no out-of-bounds write or other modification primitive.\nA:H - KASAN reports a slab-out-of-bounds BUG in ksmbd_smb2_check_message(), and the same access can oops/panic hardened or redzone-enabled kernels; a remote peer can retrigger it with further crafted compound requests."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/smb2misc.c"
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],
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"versions": [
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"lessThan": "415d0fff0451ad7ad4caa910f2bb0f562f0fd60f",
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"status": "affected",
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"lessThan": "15b38176fd1530372905c602fde51fe89ec8c877",
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/smb2misc.c"
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],
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"versions": [
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{
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"version": "5.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.183",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.148",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.101",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.18.42",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"url": "https://git.kernel.org/stable/c/f0e337e7db67cc1c832958bbb6c4026bdceacfdb"
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}
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],
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"title": "ksmbd: validate compound request size before reading StructureSize2",
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