159 lines
8.2 KiB
JSON
159 lines
8.2 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-2026-31536",
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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": "2026-03-09T15:48:24.113Z",
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"datePublished": "2026-04-24T14:30:24.224Z",
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"dateUpdated": "2026-08-05T12:23:21.869Z"
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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": "2026-08-05T12:23:21.869Z"
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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\nsmb: server: let send_done handle a completion without IB_SEND_SIGNALED\n\nWith smbdirect_send_batch processing we likely have requests without\nIB_SEND_SIGNALED, which will be destroyed in the final request\nthat has IB_SEND_SIGNALED set.\n\nIf the connection is broken all requests are signaled\neven without explicit IB_SEND_SIGNALED."
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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 code is in ksmbd SMB Direct, which accepts remote RDMA/SMB Direct connections on network ports 445 and 5445 and processes peer-controlled SMB Direct traffic.\nAC:L - An attacker can negotiate a small SMB Direct max receive size to force batched multi-WR sends, then break the connection to make unsignaled sends complete with error. The disconnect/error condition is attacker-controlled rather than an external race.\nPR:N - The path is reachable before SMB authentication: SMB Direct negotiation completes first, and SMB2 NEGOTIATE/SESSION_SETUP do not require a valid session. A pre-auth remote client can trigger outbound responses through the vulnerable RDMA send batching path.\nUI:N - No victim user action is required once ksmbd with SMB Direct is listening; the attacker only needs to connect and send protocol messages.\nS:U - The impact is within the kernel/ksmbd host security authority and does not cross a hypervisor, IOMMU, or separate sandbox boundary.\nC:H - The bug is a use-after-free/double-free style memory corruption in RDMA send objects, and kernel UAFs can be shaped into disclosure primitives through heap reuse.\nI:H - The freed `smbdirect_send_io` objects contain list pointers, CQ callbacks, and work request state; corrupting or reusing them can plausibly support arbitrary write or control-flow hijack.\nA:H - Even without full exploitation, the UAF/list corruption is expected to cause kernel warnings, crashes, or hangs during RDMA QP drain and completion handling."
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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/transport_rdma.c"
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],
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"versions": [
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{
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"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "24082642654f3e5149913946e89c00a297a8868f",
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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": "e38b415c024bc3b6321bf8650dbf3f4aab8e74b3",
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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": "9da82dc73cb03e85d716a2609364572367a5ff47",
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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/transport_rdma.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": "6.18.11",
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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": "6.19.1",
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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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{
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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": "5.15",
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"versionEndExcluding": "6.18.11"
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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": "5.15",
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"versionEndExcluding": "6.19.1"
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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": "5.15",
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"versionEndExcluding": "7.0"
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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/24082642654f3e5149913946e89c00a297a8868f"
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},
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{
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"url": "https://git.kernel.org/stable/c/e38b415c024bc3b6321bf8650dbf3f4aab8e74b3"
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},
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{
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"url": "https://git.kernel.org/stable/c/9da82dc73cb03e85d716a2609364572367a5ff47"
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}
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],
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"title": "smb: server: let send_done handle a completion without IB_SEND_SIGNALED",
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"x_generator": {
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} |