314 lines
15 KiB
JSON
314 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2023-52880",
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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": "2024-05-21T15:35:00.781Z",
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"datePublished": "2024-05-24T15:33:17.439Z",
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"dateUpdated": "2026-08-05T09:11:49.513Z"
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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": "2026-08-05T09:11:49.513Z"
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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\ntty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc\n\nAny unprivileged user can attach N_GSM0710 ldisc, but it requires\nCAP_NET_ADMIN to create a GSM network anyway.\n\nRequire initial namespace CAP_NET_ADMIN to do that."
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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:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - Exploitation is entirely local: an attacker opens a pty (/dev/ptmx), issues ioctl(TIOCSETD, N_GSM0710) → tiocsetd → tty_set_ldisc → gsmld_open, then drives GSMIOC_SETCONF and frame I/O on that tty. There is no network-facing or adjacent-link path into this code.\nAC:L - Attaching the ldisc and configuring the mux is fully attacker-controlled and deterministic on a self-owned pty, with no race or other condition outside the attacker’s influence.\nPR:L - Before the fix, gsmld_open had no capability check, so any unprivileged local user with a pty could attach N_GSM0710; CAP_NET_ADMIN was only required later for GSMIOC_ENABLE_NET, not for attach/configure.\nUI:N - The attacker performs openpty, TIOCSETD, GSMIOC_SETCONF, and subsequent I/O entirely in their own process; no victim action is required.\nS:U - Impact remains within the host kernel’s security authority as a local privilege-escalation/DoS boundary; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Unprivileged attach exposes the full n_gsm mux/parser heap paths; throughout this CVE’s lifetime the same entry path enabled serious memory-corruption bugs (e.g. CVE-2024-36016 heap OOB readable via DLCI/tty paths, timer/cleanup UAFs), yielding kernel disclosure primitives.\nI:H - The same exposed attach/configure/cleanup surface enables heap overflow and use-after-free write primitives against adjacent slab objects and gsm_mux control state, supporting arbitrary write and control-flow hijack.\nA:H - Abusing the unprivileged mux attach/teardown and parser paths reliably corrupts kernel state and triggers oops/panic (as seen in related n_gsm KASAN/oops reports), fully denying host availability."
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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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"drivers/tty/n_gsm.c"
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],
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{
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"version": "e1eaea46bb4020b38a141b84f88565d4603f8dd0",
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"status": "affected",
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"versionType": "git"
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"programFiles": [
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{
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"version": "2.6.35",
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"status": "affected"
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},
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{
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"version": "0",
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"status": "unaffected",
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},
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"version": "4.19.312",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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"status": "unaffected",
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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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"title": "tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc",
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"x_generator": {
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"engine": "bippy-1.2.0"
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},
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{
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"title": "CISA ADP Vulnrichment",
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{
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"type": "ssvc",
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"role": "CISA Coordinator",
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"options": [
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{
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},
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}
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"version": "2.0.3",
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"timestamp": "2024-05-24T19:10:27.057428Z"
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