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vuln-cve/data/2025/40xxx/CVE-2025-40253.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-40253",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T07:20:57.181Z",
"datePublished": "2025-12-04T16:08:15.340Z",
"dateUpdated": "2026-10-15T22:02:41.932Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:08:55.944Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ctcm: Fix double-kfree\n\nThe function 'mpc_rcvd_sweep_req(mpcginfo)' is called conditionally\nfrom function 'ctcmpc_unpack_skb'. It frees passed mpcginfo.\nAfter that a call to function 'kfree' in function 'ctcmpc_unpack_skb'\nfrees it again.\n\nRemove 'kfree' call in function 'mpc_rcvd_sweep_req(mpcginfo)'.\n\nBug detected by the clang static analyzer."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 8.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The malicious `TH_SWEEP_REQ` transmission header is delivered as a link-level MPC frame by the directly-attached CTC peer (a partner LPAR or a z/VM guest coupled via virtual CTCA), reaching `ctcmpc_unpack_skb()` straight from the channel read interrupt. MPC TH headers are regenerated per link and not routable, so the attacker must sit on the adjacent channel connection rather than across a routed network.\nAC:L - A single frame with `th_ch_flag = 0xfe` deterministically drives `ctcmpc_unpack_skb()` into `mpc_rcvd_sweep_req()` and the two consecutive `kfree()` calls every time — no race, no timing window, and no memory-layout precondition outside the attacker's control.\nPR:N - The attacker needs no account, credential, or capability on the target Linux image; it only has to be the CTC peer, and the path is reachable both in `MPCG_STATE_READY` and during the pre-establishment XID-negotiation states, where no authentication of any kind has occurred.\nUI:N - The remote peer triggers the double free entirely on its own by transmitting one frame on an already-active CTC link; no administrator or user action on the victim system is needed at attack time.\nS:U - The slab corruption occurs in the receiving kernel's own softirq/tasklet context and its consequences stay within that kernel's security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - On kernels without freelist hardening the double free leaves the kmalloc-64 percpu freelist self-referential, so repeated allocations hand the same 40-byte object to unrelated kernel structures, yielding an aliasing/use-after-free primitive that exposes arbitrary kernel memory contents to the attacker-controlled objects.\nI:H - The same freelist corruption lets attacker-influenced allocations overlap live kernel objects (type confusion), giving a write primitive over adjacent/aliased kernel data and a realistic path to control-flow hijack — classic exploitable heap corruption, not a mere accounting error.\nA:H - With `CONFIG_SLAB_FREELIST_HARDENED` the immediate double free hits `BUG_ON(object == fp)` in `set_freepointer()` inside a tasklet, which is fatal in interrupt context; without it the corrupted freelist causes near-certain crashes, and either outcome is re-triggerable at will by the peer."
}
]
}
],
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"negate": false,
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"title": "s390/ctcm: Fix double-kfree",
"x_generator": {
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"adp": [
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"metrics": [
{
"other": {
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"content": {
"id": "CVE-2025-40253",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-15T21:58:29.186367Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
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"shortName": "CISA-ADP",
"dateUpdated": "2026-10-15T22:02:41.932Z"
}
}
]
}
}
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