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vuln-cve/data/2025/38xxx/CVE-2025-38574.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38574",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:24.025Z",
"datePublished": "2025-08-19T17:02:53.866Z",
"dateUpdated": "2026-10-15T22:02:25.939Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:03:02.855Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npptp: ensure minimal skb length in pptp_xmit()\n\nCommit aabc6596ffb3 (\"net: ppp: Add bound checking for skb data\non ppp_sync_txmung\") fixed ppp_sync_txmunge()\n\nWe need a similar fix in pptp_xmit(), otherwise we might\nread uninit data as reported by syzbot.\n\nBUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193\n pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193\n ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline]\n ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314\n pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379\n sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148\n __release_sock+0x1d3/0x330 net/core/sock.c:3213\n release_sock+0x6b/0x270 net/core/sock.c:3767\n pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904\n sock_sendmsg_nosec net/socket.c:712 [inline]\n __sock_sendmsg+0x330/0x3d0 net/socket.c:727\n ____sys_sendmsg+0x893/0xd80 net/socket.c:2566\n ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620\n __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709"
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"baseScore": 8.6,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The defect is reached from received packets — `ppp_channel_bridge_input()` passes an unvalidated skb directly to `pptp_xmit()`, and the peer channel can be an internet-routable pppol2tp (UDP/1701) or PPTP-GRE session, whose data-plane frames carry attacker-chosen lengths; the syzbot trace itself shows the receive handler `pppoe_rcv_core()` driving this path.\nAC:L - The attacker simply sends a PPP payload shorter than 3 bytes (or one whose linear head is short); there is no race, no memory-layout dependency, and unlimited retries are possible since each malformed frame is processed independently.\nPR:N - L2TP/PPPoE/PPTP data-plane frames carry no per-packet authentication — only cleartext tunnel/session/call IDs — so an off-path or on-segment attacker who observes or guesses those IDs reaches `ppp_input()` with no credentials at all.\nUI:N - The bridged channel is part of the running relay configuration; the attacker triggers the read purely by transmitting a frame, with no action from any local user or administrator.\nS:U - The uninitialized read, the bogus `skb_pull()` and the resulting panic all occur inside the kernel's own networking authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:L - Up to three bytes of uninitialized kernel heap — stale tailroom left by a freed object, or the leading `flags`/`meta_len`/`nr_frags` fields of `skb_shared_info` past the linear data — are read; their values steer whether `ff 03` is prepended and whether a byte is stripped, giving the tunnel peer an observable oracle on kernel memory, but the read is bounded to fixed offsets and is not copied out wholesale.\nI:L - The uninitialized bytes decide `islcp` and the `skb_pull(skb, 1)` in the SC_COMP_PROT branch, so the kernel silently emits PPP frames with a stripped leading byte or spurious address/control framing, corrupting the tunneled data delivered to the peer; there is no arbitrary write or memory corruption.\nA:H - When the bridged skb is nonlinear with `skb_headlen() == 0` and the stale `data[0]` reads as zero under normally-negotiated PFC, `skb_pull(skb, 1)` drives `skb->len` below `skb->data_len` and `__skb_pull()` calls `BUG()`, panicking the machine; on KMSAN/`panic_on_warn` builds the uninit read alone is fatal."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/ppp/pptp.c"
],
"versions": [
{
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"lessThan": "97b8c5d322c5c0038cac4bc56fdbe237d0be426f",
"status": "affected",
"versionType": "git"
},
{
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"status": "affected",
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"status": "affected",
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{
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"status": "affected",
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{
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"lessThan": "b7dcda76fd0615c0599c89f36873a6cd48e02dbb",
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{
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"status": "affected",
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{
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"status": "affected",
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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/net/ppp/pptp.c"
],
"versions": [
{
"version": "2.6.12",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.12",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.297",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.241",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.190",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
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"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.102",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
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"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.15.10",
"lessThanOrEqual": "6.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
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"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.12",
"versionEndExcluding": "5.4.297"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.12",
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426f"
},
{
"url": "https://git.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770d"
},
{
"url": "https://git.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8c"
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{
"url": "https://git.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193"
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{
"url": "https://git.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611"
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{
"url": "https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba"
},
{
"url": "https://git.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbb"
},
{
"url": "https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c"
},
{
"url": "https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b"
}
],
"title": "pptp: ensure minimal skb length in pptp_xmit()",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T17:40:01.333Z"
}
},
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2025-38574",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-10-15T21:51:52.634407Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-15T22:02:25.939Z"
}
}
]
}
}
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