246 lines
12 KiB
JSON
246 lines
12 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-2026-68099",
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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": "2026-07-30T09:28:09.368Z",
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"datePublished": "2026-08-10T11:58:13.940Z",
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"dateUpdated": "2026-08-23T12:45:49.075Z"
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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": "2026-08-23T12:45:49.075Z"
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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: restore DACL size on check_add_overflow() to avoid malformed ACL\n\ncheck_add_overflow() unconditionally writes the truncated sum into *d\neven on overflow, per its contract in include/linux/overflow.h.\nThe four check_add_overflow() guards in set_posix_acl_entries_dacl()\nand set_ntacl_dacl() break out of the ACE-building loops on overflow,\nbut the truncated *size is then consumed downstream at the end of\nset_ntacl_dacl():\n\n pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size);\n\nThis produces an on-wire NT ACL whose pndacl->size under-reports the\nbytes actually written by the preceding fill_ace_for_sid()/memcpy()\ncalls, yielding a malformed ACL that can trigger out-of-bounds reads\nwhen re-parsed by clients or ksmbd itself.\n\nRestore *size to its pre-addition value on each overflow branch (via\n`*size -= ace_sz` / `size -= nt_ace_size`) so that after the break,\n*size once again holds the cumulative size of the successfully-written\nACEs. The committed ACL is then truncated-but-self-consistent rather\nthan malformed.\n\nThe ksmbd DACL builders are the only check_add_overflow() sites found\nwhere an overflow path breaks out of a loop and the destination value\nis consumed afterward. The other nearby break-style cases either\nreturn -EINVAL on overflow (transport_ipc.c) or break without\nconsuming the overflowed destination value afterward (buildid.c)."
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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/smbacl.c"
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],
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"versions": [
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{
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"version": "41e53a773db6342ac9a689ee5ba635c31744c9f0",
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"lessThan": "8f3a7a499a7d9bb1c0f33fe78c4a4594d7e307f4",
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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": "8d5729350b236896f51379588d9a690b7fafb8db",
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"lessThan": "f4fcd0c1a243d449307b887fafee23921e9db5ab",
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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": "e1955a94b6f17f4b058afa955a6f187eb3ed7615",
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"lessThan": "0bf38372821b1526f31538a7d9811844c55c7f38",
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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": "5e7b8f3c539d69b2ed5f2408e2f75e68ce7eef43",
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"lessThan": "847ecd4eb3c117c3d2f13f1e7ab506543aad8183",
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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": "299f962c0b02d048fb45d248b4da493d03f3175d",
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"lessThan": "bc90144ce8bb7fcf05ad9417c7adb4e9509d9e13",
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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": "299f962c0b02d048fb45d248b4da493d03f3175d",
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"lessThan": "bbf0a8e931204ecdab494a88d43b0a24a04285c5",
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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": "ef7902be3f215b6bf7babe4dc9dd9a7d57dad7a7",
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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": "6.1.175",
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"lessThan": "6.1.184",
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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": "6.6.136",
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"lessThan": "6.6.148",
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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": "6.12.84",
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"lessThan": "6.12.101",
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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": "6.18.25",
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"lessThan": "6.18.42",
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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": "7.0.2",
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"lessThan": "7.1",
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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/smbacl.c"
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],
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"versions": [
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{
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"version": "7.1",
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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": "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": "6.1.184",
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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": "6.6.148",
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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": "6.12.101",
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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": "6.18.42",
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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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],
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"cpeApplicability": [
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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": "6.1.175",
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"versionEndExcluding": "6.1.184"
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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": "6.6.136",
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"versionEndExcluding": "6.6.148"
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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": "6.12.84",
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"versionEndExcluding": "6.12.101"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18.25",
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"versionEndExcluding": "6.18.42"
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},
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{
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.1.6"
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"versionStartIncluding": "7.0.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8f3a7a499a7d9bb1c0f33fe78c4a4594d7e307f4"
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},
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{
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"url": "https://git.kernel.org/stable/c/f4fcd0c1a243d449307b887fafee23921e9db5ab"
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},
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{
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"url": "https://git.kernel.org/stable/c/0bf38372821b1526f31538a7d9811844c55c7f38"
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},
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{
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"url": "https://git.kernel.org/stable/c/847ecd4eb3c117c3d2f13f1e7ab506543aad8183"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc90144ce8bb7fcf05ad9417c7adb4e9509d9e13"
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},
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{
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"url": "https://git.kernel.org/stable/c/bbf0a8e931204ecdab494a88d43b0a24a04285c5"
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}
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],
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"title": "ksmbd: restore DACL size on check_add_overflow() to avoid malformed ACL",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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} |