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vuln-cve/data/2024/42xxx/CVE-2024-42280.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2024-42280",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-07-30T07:40:12.261Z",
"datePublished": "2024-08-17T09:08:47.699Z",
"dateUpdated": "2026-08-05T11:36:19.140Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T11:36:19.140Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: Fix a use after free in hfcmulti_tx()\n\nDon't dereference *sp after calling dev_kfree_skb(*sp)."
}
],
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{
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
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{
"lang": "en",
"value": "AV:L - `hfcmulti_tx()` is reached from `mISDN_sock_sendmsg()` → `handle_bmsg()`/`handle_dmsg()` on an `AF_ISDN` SOCK_DGRAM socket, i.e. a local syscall path, or from the card's IRQ/timer handler on the same host. There is no IP-network-facing consumer of this code.\nAC:L - The attacker deterministically arms the path by issuing two back-to-back `sendmsg()` calls so `bchannel_senddata()` sets `FLG_TX_NEXT`/`next_skb` (or `dchannel_senddata()` queues to `squeue`), guaranteeing `get_next_bframe()`/`get_next_dframe()` returns 1 and the post-free dereference executes. All call sites hold `hc->lock`, so there is no race to win and no memory-layout precondition.\nPR:L - `data_sock_create()` performs no `capable()` check — only `base_sock_create()` (ISDN_P_BASE/SOCK_RAW) requires `CAP_NET_RAW` — and `data_sock_bind()`/`connect_Bstack()` add no further gate, so any unprivileged local user can bind a B- or D-channel and drive the transmit path.\nUI:N - The attacker performs every step itself — socket, bind, PH_ACTIVATE_REQ, then the two queued sends — with no action required from an administrator or any other user.\nS:U - The freed object is a kernel `sk_buff` and any corruption stays within the kernel's own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - Per the published use-after-free, the stale `(*sp)->len` sizes a `write_fifo()` read from `(*sp)->data`, pushing freed-heap contents out onto the ISDN B-/D-channel to the far end of the line; heap grooming of the reclaimed skb makes this a controllable kernel-memory disclosure.\nI:H - A use-after-free lets the attacker reclaim the freed `sk_buff` with attacker-shaped data, so the `len` and `data` fields consumed afterwards become attacker-controlled, yielding a write/pointer primitive usable for control-flow hijacking.\nA:H - Dereferencing a freed skb and DMAing/PIO-ing from a dangling `data` pointer readily oopses or panics the kernel, and the sequence can be repeated at will from an unprivileged process."
}
]
}
],
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"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/isdn/hardware/mISDN/hfcmulti.c"
],
"versions": [
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"lessThan": "70db2c84631f50e02e6b32b543700699dd395803",
"status": "affected",
"versionType": "git"
},
{
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"status": "affected",
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{
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"lessThan": "7e4a539bca7d8d20f2c5d93c18cce8ef77cd78e0",
"status": "affected",
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{
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"lessThan": "61ab751451f5ebd0b98e02276a44e23a10110402",
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]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/isdn/hardware/mISDN/hfcmulti.c"
],
"versions": [
{
"version": "2.6.27",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.27",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.19.320",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.282",
"lessThanOrEqual": "5.4.*",
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},
{
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"lessThanOrEqual": "5.10.*",
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},
{
"version": "5.15.165",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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},
{
"version": "6.1.103",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.44",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.10.3",
"lessThanOrEqual": "6.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.11",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
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"nodes": [
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"operator": "OR",
"negate": false,
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
{
"url": "https://git.kernel.org/stable/c/70db2c84631f50e02e6b32b543700699dd395803"
},
{
"url": "https://git.kernel.org/stable/c/d3e4d4a98c5629ccdcb762a0ff6c82ba9738a0c3"
},
{
"url": "https://git.kernel.org/stable/c/9460ac3dd1ae033bc2b021a458fb535a0c36ddb2"
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{
"url": "https://git.kernel.org/stable/c/8f4030277dfb9dbe04fd78566b19931097c9d629"
},
{
"url": "https://git.kernel.org/stable/c/4d8b642985ae24f4b3656438eb8489834a17bb80"
},
{
"url": "https://git.kernel.org/stable/c/ddc79556641ee070d36be0de4a1f0a16a71f1fc7"
},
{
"url": "https://git.kernel.org/stable/c/7e4a539bca7d8d20f2c5d93c18cce8ef77cd78e0"
},
{
"url": "https://git.kernel.org/stable/c/61ab751451f5ebd0b98e02276a44e23a10110402"
}
],
"title": "mISDN: Fix a use after free in hfcmulti_tx()",
"x_generator": {
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},
"adp": [
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"metrics": [
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"type": "ssvc",
"content": {
"id": "CVE-2024-42280",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2024-09-10T16:11:39.682152Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
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"shortName": "CISA-ADP",
"dateUpdated": "2024-09-12T17:33:31.049Z"
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},
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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{
"url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
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"shortName": "CVE",
"dateUpdated": "2025-11-03T22:03:20.326Z"
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