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vuln-cve/data/2025/38xxx/CVE-2025-38273.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38273",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:23.998Z",
"datePublished": "2025-07-10T07:41:54.415Z",
"dateUpdated": "2026-08-05T12:00:54.344Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:00:54.344Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tipc: fix refcount warning in tipc_aead_encrypt\n\nsyzbot reported a refcount warning [1] caused by calling get_net() on\na network namespace that is being destroyed (refcount=0). This happens\nwhen a TIPC discovery timer fires during network namespace cleanup.\n\nThe recently added get_net() call in commit e279024617134 (\"net/tipc:\nfix slab-use-after-free Read in tipc_aead_encrypt_done\") attempts to\nhold a reference to the network namespace. However, if the namespace\nis already being destroyed, its refcount might be zero, leading to the\nuse-after-free warning.\n\nReplace get_net() with maybe_get_net(), which safely checks if the\nrefcount is non-zero before incrementing it. If the namespace is being\ndestroyed, return -ENODEV early, after releasing the bearer reference.\n\n[1]: https://lore.kernel.org/all/68342b55.a70a0220.253bc2.0091.GAE@google.com/T/#m12019cf9ae77e1954f666914640efa36d52704a2"
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"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"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The trigger is a purely local sequence — create a network namespace, enable a TIPC bearer, install an AEAD key via TIPC genetlink, then tear the namespace down — with no remote peer or packet required. `init_net`'s refcount never reaches zero, so the bug is only reachable through locally-driven netns destruction.\nAC:L - The attacker controls both sides of the race: they start the discovery timer (which re-arms at least every second while the bearer is up) and they choose when to destroy the namespace, and `cleanup_net()`'s window (batched teardown, `pernet_ops_rwsem`, `rcu_barrier()`) routinely exceeds that interval. The sequence is scriptable in a tight loop, and unlike the parent UAF no cryptd/SIMD fallback is needed since `get_net()` runs on every encrypt.\nPR:L - TIPC bearer-enable and key-set are gated on CAP_NET_ADMIN, but every op in net/tipc/netlink.c uses `GENL_UNS_ADMIN_PERM`, which is satisfied by CAP_NET_ADMIN in a user-namespace-owned netns — an unprivileged user reaches all of it via `unshare -Urn`. No real root in the initial namespace is required.\nUI:N - The entire sequence is performed by the attacker's own process; the discovery timer fires on its own from softirq context. No victim action or interaction of any kind is involved.\nS:U - The corrupted refcount, the freed `tipc_crypto`, and the freed `struct net` all belong to the kernel's own security authority. There is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The failed reference acquisition re-opens the slab use-after-free it was meant to close: `tipc_aead_encrypt_done()` runs from the cryptd workqueue against a `tipc_crypto` already freed by `tipc_crypto_stop()` and a `struct net` freed by `cleanup_net()`, reading `tx->stats`, `b->up`, and `tx_ctx` out of reallocated slab memory. A UAF read on attacker-groomable heap is treated as arbitrary kernel memory disclosure.\nI:H - The same window yields write primitives on freed memory — `this_cpu_inc(tx->stats->stat[...])` through a freed per-CPU pointer and `put_net()`'s atomic decrement on the freed `struct net` — which is heap-sprayable into an attacker-chosen object. Additionally the refcount is force-set to `REFCOUNT_SATURATED`, corrupting namespace lifetime accounting.\nA:H - The immediate result is a `WARN_ONCE` splat, which is an outright kernel panic on the many hardened, cloud, and syzkaller-style deployments running `panic_on_warn=1`, and the subsequent use-after-free reliably oopses even when not weaponized. The whole sequence is repeatable in a loop by an unprivileged local user."
}
]
}
],
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"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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],
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"lessThan": "5.15.186",
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},
{
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"lessThan": "6.1.142",
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{
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{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
"versions": [
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{
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{
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"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
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"cpeApplicability": [
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"nodes": [
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"negate": false,
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"references": [
{
"url": "https://git.kernel.org/stable/c/445d59025d76d0638b03110f8791d5b89ed5162d"
},
{
"url": "https://git.kernel.org/stable/c/e0b11227c4e8eb4bdf1b86aa8f0f3abb24e0f029"
},
{
"url": "https://git.kernel.org/stable/c/307391e8fe70401a6d39ecc9978e13c2c0cdf81f"
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"url": "https://git.kernel.org/stable/c/acab7ca5ff19889b80a8ee7dec220ee1a96dede9"
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{
"url": "https://git.kernel.org/stable/c/c762fc79d710d676b793f9d98b1414efe6eb51e6"
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{
"url": "https://git.kernel.org/stable/c/9ff60e0d9974dccf24e89bcd3ee7933e538d929f"
},
{
"url": "https://git.kernel.org/stable/c/f29ccaa07cf3d35990f4d25028cc55470d29372b"
}
],
"title": "net: tipc: fix refcount warning in tipc_aead_encrypt",
"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": "2025-11-03T17:36:08.105Z"
}
}
]
}
}
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