248 lines
13 KiB
JSON
248 lines
13 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-2026-31432",
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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": "2026-03-09T15:48:24.089Z",
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"datePublished": "2026-04-22T08:15:10.873Z",
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"dateUpdated": "2026-10-30T12:24:13.087Z"
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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": "2026-10-30T12:24:13.087Z"
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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: fix OOB write in QUERY_INFO for compound requests\n\nWhen a compound request such as READ + QUERY_INFO(Security) is received,\nand the first command (READ) consumes most of the response buffer,\nksmbd could write beyond the allocated buffer while building a security\ndescriptor.\n\nThe root cause was that smb2_get_info_sec() checked buffer space using\nppntsd_size from xattr, while build_sec_desc() often synthesized a\nsignificantly larger descriptor from POSIX ACLs.\n\nThis patch introduces smb_acl_sec_desc_scratch_len() to accurately\ncompute the final descriptor size beforehand, performs proper buffer\nchecking with smb2_calc_max_out_buf_len(), and uses exact-sized\nallocation + iov pinning."
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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:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 the in-kernel SMB server listening on TCP/445, directly reachable over the network by any remote SMB client.\nAC:L - The attacker reliably triggers the OOB write by crafting a compound request (e.g., READ + QUERY_INFO(Security)) where the first command consumes most of the response buffer. No race condition or special conditions are needed.\nPR:L - The QUERY_INFO command requires a valid SMB session (checked by smb2_check_user_session), a tree connect, and an open file handle. Even guest access requires completing session setup, so low privileges are needed.\nUI:N - No user interaction is required; the attacker sends the compound request directly to the ksmbd server.\nS:U - The vulnerability results in kernel heap corruption within the same security authority (the kernel); no security boundary such as a VM or sandbox is crossed.\nC:H - The heap buffer overflow writes past the kvzalloc'd response buffer into adjacent kernel heap objects. This OOB write can be leveraged to corrupt adjacent structures and create information disclosure primitives.\nI:H - The OOB write corrupts kernel heap memory with attacker-influenced data (security descriptor content including SIDs and ACEs derived from file ACLs), enabling potential control flow hijacking or arbitrary write primitives.\nA:H - The heap buffer overflow corrupts adjacent kernel data structures, reliably causing kernel crashes or panics."
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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/smb2pdu.c",
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"fs/smb/server/smbacl.c",
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"fs/smb/server/smbacl.h"
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],
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"versions": [
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{
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"version": "9f297df20d93411c0b4ddad7f88ba04a7cd36e77",
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"lessThan": "533f84264e28c54a79257ea87d2f94a0fcc9a611",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "850452af77f55d185f9445e1f7a1db53c5e4aad4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "075ea208c648cc2bcd616295b711d3637c61de45",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "515c2daab46021221bdf406bef19bc90a44ec617",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
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"lessThan": "fda9522ed6afaec45cabc198d8492270c394c7bc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f2283680a80571ca82d710bc6ecd8f8beac67d63",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.1.71",
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"lessThan": "6.1.191",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.145",
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"lessThan": "5.16",
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"status": "affected",
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"versionType": "semver"
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}
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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/smb2pdu.c",
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"fs/smb/server/smbacl.c",
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"fs/smb/server/smbacl.h"
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],
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"versions": [
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{
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"version": "6.6",
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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": "6.6",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.143",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.81",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.22",
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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": "6.19.12",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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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],
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"cpeApplicability": [
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.71",
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"versionEndExcluding": "6.1.191"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6",
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"versionEndExcluding": "6.6.143"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.12.81"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/533f84264e28c54a79257ea87d2f94a0fcc9a611"
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},
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{
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"url": "https://git.kernel.org/stable/c/850452af77f55d185f9445e1f7a1db53c5e4aad4"
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},
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{
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"url": "https://git.kernel.org/stable/c/d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09"
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},
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{
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"url": "https://git.kernel.org/stable/c/075ea208c648cc2bcd616295b711d3637c61de45"
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},
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{
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"url": "https://git.kernel.org/stable/c/515c2daab46021221bdf406bef19bc90a44ec617"
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},
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{
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"url": "https://git.kernel.org/stable/c/fda9522ed6afaec45cabc198d8492270c394c7bc"
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}
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],
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"title": "ksmbd: fix OOB write in QUERY_INFO for compound requests",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |