179 lines
10 KiB
JSON
179 lines
10 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-2026-31444",
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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": "2026-03-09T15:48:24.090Z",
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"datePublished": "2026-04-22T13:53:41.351Z",
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"dateUpdated": "2026-08-05T12:22:35.585Z"
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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": "2026-08-05T12:22:35.585Z"
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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 use-after-free and NULL deref in smb_grant_oplock()\n\nsmb_grant_oplock() has two issues in the oplock publication sequence:\n\n1) opinfo is linked into ci->m_op_list (via opinfo_add) before\n add_lease_global_list() is called. If add_lease_global_list()\n fails (kmalloc returns NULL), the error path frees the opinfo\n via __free_opinfo() while it is still linked in ci->m_op_list.\n Concurrent m_op_list readers (opinfo_get_list, or direct iteration\n in smb_break_all_levII_oplock) dereference the freed node.\n\n2) opinfo->o_fp is assigned after add_lease_global_list() publishes\n the opinfo on the global lease list. A concurrent\n find_same_lease_key() can walk the lease list and dereference\n opinfo->o_fp->f_ci while o_fp is still NULL.\n\nFix by restructuring the publication sequence to eliminate post-publish\nfailure:\n\n- Set opinfo->o_fp before any list publication (fixes NULL deref).\n- Preallocate lease_table via alloc_lease_table() before opinfo_add()\n so add_lease_global_list() becomes infallible after publication.\n- Keep the original m_op_list publication order (opinfo_add before\n lease list) so concurrent opens via same_client_has_lease() and\n opinfo_get_list() still see the in-flight grant.\n- Use opinfo_put() instead of __free_opinfo() on err_out so that\n the RCU-deferred free path is used.\n\nThis also requires splitting add_lease_global_list() to take a\npreallocated lease_table and changing its return type from int to void,\nsince it can no longer fail."
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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:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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 - The vulnerable path is reachable through ksmbd over SMB on TCP/445 via SMB2 CREATE/open requests carrying lease contexts.\nAC:L - An attacker can drive the relevant lease/oplock publication races with concurrent SMB opens and attacker-chosen lease keys/client GUIDs; no condition outside attacker influence is required for the NULL dereference path.\nPR:N - Although SMB2 CREATE requires a valid session and tree connection, ksmbd supports guest/anonymous sessions and guest shares, making unauthenticated remote triggering reasonable in exposed deployments.\nUI:N - No victim user action is needed once the ksmbd service and share are reachable; the attacker sends SMB protocol requests directly.\nS:U - The vulnerability affects the kernel SMB server within the same host security authority and does not cross a separate security boundary such as a VM escape.\nC:H - The bug includes a use-after-free of struct oplock_info left reachable from shared lists, which can plausibly be leveraged for kernel memory disclosure through heap reuse.\nI:H - The use-after-free is kernel memory corruption in a network-reachable path and can plausibly be exploited for control-flow or data-structure corruption.\nA:H - Both the NULL dereference and use-after-free can crash or oops the kernel, causing high availability impact."
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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/oplock.c"
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],
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"versions": [
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{
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"version": "302fef75512b2c8329a3f5efab1ae7ba2562387a",
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"lessThan": "9e785f004cbc56390479b77375726ea9b0d1a8a6",
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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": "08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c",
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"lessThan": "7de55bba69cbf0f9280daaea385daf08bc076121",
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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": "1d6abf145615dbfe267ce3b0a271f95e3780e18e",
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"lessThan": "a5c6f6d6ceefed2d5210ee420fb75f8362461f46",
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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": "ce8507ee82c888126d8e7565e27c016308d24cde",
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"lessThan": "6d7e5a918c1d0aad06db0e17677b66fc9a471021",
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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": "1dfd062caa165ec9d7ee0823087930f3ab8a6294",
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"lessThan": "48623ec358c1c600fa1e38368746f933e0f1a617",
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"status": "affected",
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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": "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/oplock.c"
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],
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"versions": [
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{
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"version": "6.6.130",
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"lessThan": "6.6.131",
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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": "6.12.78",
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"lessThan": "6.12.80",
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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": "6.18.19",
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"lessThan": "6.18.21",
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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": "6.19.9",
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"lessThan": "6.19.11",
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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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"cpeApplicability": [
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{
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.130",
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"versionEndExcluding": "6.6.131"
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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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]
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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/9e785f004cbc56390479b77375726ea9b0d1a8a6"
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},
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{
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"url": "https://git.kernel.org/stable/c/7de55bba69cbf0f9280daaea385daf08bc076121"
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},
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{
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"url": "https://git.kernel.org/stable/c/a5c6f6d6ceefed2d5210ee420fb75f8362461f46"
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},
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{
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"url": "https://git.kernel.org/stable/c/6d7e5a918c1d0aad06db0e17677b66fc9a471021"
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},
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{
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"url": "https://git.kernel.org/stable/c/48623ec358c1c600fa1e38368746f933e0f1a617"
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}
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],
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"title": "ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()",
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"x_generator": {
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} |