182 lines
9.8 KiB
JSON
182 lines
9.8 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-2025-37776",
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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": "2025-04-16T04:51:23.939Z",
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"datePublished": "2025-05-01T13:07:14.998Z",
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"dateUpdated": "2026-08-05T11:57:27.462Z"
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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": "2026-08-05T11:57:27.462Z"
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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 in smb_break_all_levII_oplock()\n\nThere is a room in smb_break_all_levII_oplock that can cause racy issues\nwhen unlocking in the middle of the loop. This patch use read lock\nto protect whole loop."
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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 on TCP/445, and every trigger path (SMB2 WRITE, CREATE with O_TRUNC, SET_INFO alloc-size/rename, IOCTL copychunk/zero-data, LOCK) is driven entirely by remote SMB2 traffic. No local access is required.\nAC:L - The attacker controls both sides of the race: one connection holds the level-II oplock and simply withholds the SMB2_OPLOCK_BREAK ack, pinning the RCU-unlocked window open for up to OPLOCK_WAIT_TIME (35 s), while other connections close handles on the same inode to drive opinfo_del()/opinfo_put(). An attacker-created race with a multi-second window is reliably winnable and repeatable.\nPR:L - All call sites dereference work->tcon->share_conf, so a completed SESSION_SETUP and TREE_CONNECT are needed — any unprivileged share account (including guest where \"map to guest\" is configured) suffices, with no administrative rights. This matches the sibling post-authentication ksmbd UAFs.\nUI:N - The attacker drives every step from its own SMB connections — taking the oplock, stalling the break ack, and closing handles concurrently. No action by an administrator or any other client is needed.\nS:U - The freed object and the resulting corruption are both inside the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The ~176-byte oplock_info lives in the general kmalloc-192 cache and is remotely sprayable, so the freed object can be reclaimed with attacker-controlled bytes at the op_entry.next offset, yielding a chosen brk_op whose ->conn and ->o_lease->state dereferences give arbitrary kernel memory disclosure.\nI:H - With a controlled brk_op pointer, atomic_inc_not_zero(&brk_op->refcount) is an arbitrary-address increment write, and oplock_break() then manipulates wait-queue lists and queues work off the fake object — a use-after-free that is exploitable for control-flow hijack and arbitrary kernel code execution.\nA:H - Even unweaponized, following op_entry.next out of a freed oplock_info dereferences freed/poisoned memory and reliably oopses or panics the kernel, and the attacker can repeat the sequence to keep the SMB server down."
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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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"fs/smb/server/oplock.h"
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],
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"versions": [
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{
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"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "296cb5457cc6f4a754c4ae29855f8a253d52bcc6",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "d54ab1520d43e95f9b2e22d7a05fc9614192e5a5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"lessThan": "d73686367ad68534257cd88a36ca3c52cb8b81d8",
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"lessThan": "18b4fac5ef17f77fed9417d22210ceafd6525fc7",
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"status": "affected",
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"versionType": "git"
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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/oplock.c",
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"fs/smb/server/oplock.h"
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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": "6.6.88",
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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": "6.12.25",
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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": "6.14.4",
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"lessThanOrEqual": "6.14.*",
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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": "6.15",
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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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"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": "5.15",
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"versionEndExcluding": "6.6.88"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.14.4"
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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/296cb5457cc6f4a754c4ae29855f8a253d52bcc6"
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},
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{
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"url": "https://git.kernel.org/stable/c/d54ab1520d43e95f9b2e22d7a05fc9614192e5a5"
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},
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{
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"url": "https://git.kernel.org/stable/c/d73686367ad68534257cd88a36ca3c52cb8b81d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/18b4fac5ef17f77fed9417d22210ceafd6525fc7"
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}
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],
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"title": "ksmbd: fix use-after-free in smb_break_all_levII_oplock()",
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"x_generator": {
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} |