275 lines
14 KiB
JSON
275 lines
14 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-2021-47240",
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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": "2024-04-10T18:59:19.532Z",
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"datePublished": "2024-05-21T14:19:40.363Z",
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"dateUpdated": "2026-08-05T08:46:52.072Z"
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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": "2026-08-05T08:46:52.072Z"
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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\nnet: qrtr: fix OOB Read in qrtr_endpoint_post\n\nSyzbot reported slab-out-of-bounds Read in\nqrtr_endpoint_post. The problem was in wrong\n_size_ type:\n\n\tif (len != ALIGN(size, 4) + hdrlen)\n\t\tgoto err;\n\nIf size from qrtr_hdr is 4294967293 (0xfffffffd), the result of\nALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293\nin header this check won't fail and\n\n\tskb_put_data(skb, data + hdrlen, size);\n\nwill read out of bound from data, which is hdrlen allocated block."
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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:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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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:L - qrtr_endpoint_post is reached from local endpoint drivers (MHI/SMD to an on-board modem or WiFi peer over PCIe, or a write to /dev/qrtr-tun); mainline QRTR has no IP transport, so a remote network packet cannot hit this path.\nAC:L - A crafted QRTR header with size near UINT_MAX (e.g. 0xfffffffd) deterministically makes ALIGN(size,4) wrap to 0 so the length check passes; the attacker fully controls the packet bytes and needs no race or unpredictable layout.\nPR:N - On the MHI/SMD path the vulnerable parser runs on unauthenticated device-to-host IPCR completions with no host capability or credential check, so a compromised or malicious peripheral peer triggers it without any local account (worst case over the also-reachable PR:L qrtr-tun path).\nUI:N - The attacker (or malicious MHI peer) delivers the malformed packet itself; no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - The resulting kernel heap read/write and oops stay inside the host kernel's QRTR authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - skb_put_data memcpy performs a multi-gigabyte out-of-bounds read from the hdrlen-sized source buffer into/past the skb (KASAN: Read of size ~4294967294), which per guidance is an unbounded OOB read treated as High confidentiality impact.\nI:H - The same memcpy writes past the hdrlen-sized skb into adjacent kernel memory because sk_buff_data_t wrap bypasses skb_put's overflow check (confirmed by the later 32-bit follow-up describing a write past the skb), yielding a heap overflow write primitive.\nA:H - The huge OOB access faults/oopses the kernel (and is a hard KASAN failure), producing full availability loss on affected systems."
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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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"net/qrtr/qrtr.c"
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],
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"versions": [
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{
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"version": "194ccc88297ae78d0803adad83c6dcc369787c9e",
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"lessThan": "f8111c0d7ed42ede41a3d0d393b104de0730a8a6",
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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": "194ccc88297ae78d0803adad83c6dcc369787c9e",
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"lessThan": "26b8d10703a9be45d6097946b2b4011f7dd2c56f",
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"status": "affected",
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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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"net/qrtr/qrtr.c"
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],
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"versions": [
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{
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"version": "4.15",
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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": "4.15",
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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": "4.19.196",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.128",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.46",
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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": "5.12.13",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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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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"title": "net: qrtr: fix OOB Read in qrtr_endpoint_post",
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