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vuln-cve/data/2025/38xxx/CVE-2025-38003.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38003",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:23.977Z",
"datePublished": "2025-06-08T10:34:55.808Z",
"dateUpdated": "2026-08-05T11:58:54.550Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T11:58:54.550Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: add missing rcu read protection for procfs content\n\nWhen the procfs content is generated for a bcm_op which is in the process\nto be removed the procfs output might show unreliable data (UAF).\n\nAs the removal of bcm_op's is already implemented with rcu handling this\npatch adds the missing rcu_read_lock() and makes sure the list entries\nare properly removed under rcu protection."
}
],
"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 - Exploitation requires a local account to open a PF_CAN/CAN_BCM socket, issue RX_SETUP/RX_DELETE via sendmsg(), and read /proc/net/can-bcm/<inode>. No remote or adjacent network path reaches the racing procfs reader.\nAC:L - The attacker controls both sides of the race entirely — one thread loops reading the procfs entry while another loops RX_SETUP/RX_DELETE — and bcm_proc_show() held no lock whatsoever against the deleter, so the window is hit reliably by simple repetition; a working PoC was produced by the reporter for this bcm series.\nPR:L - can_create() performs no capability check, connect() with ifindex 0 needs no CAN device, and the created proc entry is mode 0644, so any unprivileged local user can drive the whole sequence in its own process (module autoload of can/can-bcm is also unprivileged).\nUI:N - The attacker performs every step itself — socket setup, op deletion, and reading its own procfs file — with no action by any other user.\nS:U - The freed object, the disclosure, and the crash are all within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Fields are read from a freed bcm_op and formatted directly into world-readable procfs output; since bcm_op lands in the sprayable kmalloc-512 cache, an attacker reclaiming it controls the list cursor and can steer the walk to arbitrary kernel addresses, leaking their contents to userspace.\nI:H - This is a use-after-free on an attacker-reclaimable slab object whose linkage pointers are dereferenced after free, a primitive that combined with heap grooming is leveraged for kernel state corruption and control-flow influence.\nA:H - A concurrent plain list_del() leaves LIST_POISON1 in the cursor, so the unprotected walker dereferences a non-canonical/freed pointer and oopses; the walk can also spin over reclaimed memory or hit a divide-by-zero on a re-read frames_abs, crashing or hanging the kernel."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/can/bcm.c"
],
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{
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"status": "affected",
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{
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"lessThan": "1f912f8484e9c4396378c39460bbea0af681f319",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "63567ecd99a24495208dc860d50fb17440043006",
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{
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{
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"status": "affected",
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{
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"status": "affected",
"versionType": "git"
},
{
"version": "5.4.205",
"lessThan": "5.4.294",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.10.130",
"lessThan": "5.10.238",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.15.54",
"lessThan": "5.15.185",
"status": "affected",
"versionType": "semver"
},
{
"version": "4.19.252",
"lessThan": "4.20",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.18.11",
"lessThan": "5.19",
"status": "affected",
"versionType": "semver"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/can/bcm.c"
],
"versions": [
{
"version": "5.19",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.19",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.294",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
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"lessThanOrEqual": "5.10.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "6.1.*",
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},
{
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},
{
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"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.14.9",
"lessThanOrEqual": "6.14.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.15",
"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": "5.4.205",
"versionEndExcluding": "5.4.294"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/19f553a1ddf260da6570ed8f8d91a8c87f49b63a"
},
{
"url": "https://git.kernel.org/stable/c/659701c0b954ccdb4a916a4ad59bbc16e726d42c"
},
{
"url": "https://git.kernel.org/stable/c/0622846db728a5332b917c797c733e202c4620ae"
},
{
"url": "https://git.kernel.org/stable/c/6d7d458c41b98a5c1670cbd36f2923c37de51cf5"
},
{
"url": "https://git.kernel.org/stable/c/1f912f8484e9c4396378c39460bbea0af681f319"
},
{
"url": "https://git.kernel.org/stable/c/63567ecd99a24495208dc860d50fb17440043006"
},
{
"url": "https://git.kernel.org/stable/c/7c9db92d5f0eadca30884af75c53d601edc512ee"
},
{
"url": "https://git.kernel.org/stable/c/dac5e6249159ac255dad9781793dbe5908ac9ddb"
}
],
"title": "can: bcm: add missing rcu read protection for procfs content",
"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": "2025-11-03T17:33:02.902Z"
}
}
]
}
}
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