216 lines
11 KiB
JSON
216 lines
11 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-2022-49743",
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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": "2025-03-27T16:39:17.987Z",
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"datePublished": "2025-03-27T16:42:54.289Z",
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"dateUpdated": "2026-10-15T21:21:07.990Z"
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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": "2026-08-05T08:56:12.285Z"
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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\novl: Use \"buf\" flexible array for memcpy() destination\n\nThe \"buf\" flexible array needs to be the memcpy() destination to avoid\nfalse positive run-time warning from the recent FORTIFY_SOURCE\nhardening:\n\n memcpy: detected field-spanning write (size 93) of single field \"&fh->fb\"\n at fs/overlayfs/export.c:799 (size 21)"
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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:N/I:N/A:H",
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"baseScore": 7.5,
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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 - ovl_fid_to_fh() is reached via ovl_fh_to_dentry export_operations when an overlay is mounted with nfs_export=on and exported through nfsd; a remote NFS client triggers decode by sending a crafted OVL_FILEID_V0 (0xfb) filehandle.\nAC:L - The attacker fully controls the filehandle type and payload and can reliably force the V0 realignment memcpy path; no race or unpredictable victim state is required.\nPR:N - nfsd invokes exportfs_decode_fh during fh_verify before file permission checks; on common AUTH_SYS exports, any host permitted by the export list can send the crafted handle with no credentials.\nUI:N - Exploitation requires only sending an NFS request with a crafted filehandle; no victim user action is needed once the overlay is NFS-exported.\nS:U - Impact remains within the host kernel authority; this is not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:N - The commit documents a FORTIFY_SOURCE false positive: kzalloc(buflen) correctly covers the memcpy of buflen-OVL_FH_WIRE_OFFSET, so there is no out-of-bounds read or information disclosure.\nI:N - There is no real buffer overflow or memory corruption—only a mis-typed memcpy destination (&fh->fb vs fh->buf)—so no write primitive or integrity impact exists.\nA:H - CONFIG_FORTIFY_SOURCE emits a kernel WARN_ONCE on the field-spanning write; with panic_on_warn (common on Android/hardened hosts) this becomes a kernel panic, matching DoS/crash severity."
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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/overlayfs/export.c",
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"fs/overlayfs/overlayfs.h"
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],
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"versions": [
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{
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"version": "cbe7fba8edfc8cb8e621599e376f8ac5c224fa72",
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"lessThan": "012cdef22000f3104e4fa8224ad29fde509b8caf",
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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": "cbe7fba8edfc8cb8e621599e376f8ac5c224fa72",
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"lessThan": "a77141a06367825d639ac51b04703d551163e36c",
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"status": "affected",
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{
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"lessThan": "07a96977b2f462337a9121302de64277b8747ab1",
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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": "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/overlayfs/export.c",
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"fs/overlayfs/overlayfs.h"
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],
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"versions": [
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{
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"version": "5.5",
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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": "5.5",
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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": "5.10.248",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.93",
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"lessThanOrEqual": "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": "6.1.11",
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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": "6.2",
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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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"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": "5.5",
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"versionEndExcluding": "5.10.248"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.5",
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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/012cdef22000f3104e4fa8224ad29fde509b8caf"
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},
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{
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"url": "https://git.kernel.org/stable/c/a77141a06367825d639ac51b04703d551163e36c"
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},
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{
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"url": "https://git.kernel.org/stable/c/07a96977b2f462337a9121302de64277b8747ab1"
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},
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{
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"url": "https://git.kernel.org/stable/c/cf8aa9bf97cadf85745506c6a3e244b22c268d63"
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}
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],
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"title": "ovl: Use \"buf\" flexible array for memcpy() destination",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2022-49743",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:18:12.828083Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T21:21:07.990Z"
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}
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}
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}
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} |