{ "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/. 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" ], "versions": [ { "version": "5b48f5711f1c630841ab78dcc061de902f0e37bf", "lessThan": "19f553a1ddf260da6570ed8f8d91a8c87f49b63a", "status": "affected", "versionType": "git" }, { "version": "85cd41070df992d3c0dfd828866fdd243d3b774a", "lessThan": "659701c0b954ccdb4a916a4ad59bbc16e726d42c", "status": "affected", "versionType": "git" }, { "version": "f34f2a18e47b73e48f90a757e1f4aaa8c7d665a1", "lessThan": "0622846db728a5332b917c797c733e202c4620ae", "status": "affected", "versionType": "git" }, { "version": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386", "lessThan": "6d7d458c41b98a5c1670cbd36f2923c37de51cf5", "status": "affected", "versionType": "git" }, { "version": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386", "lessThan": "1f912f8484e9c4396378c39460bbea0af681f319", "status": "affected", "versionType": "git" }, { "version": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386", "lessThan": "63567ecd99a24495208dc860d50fb17440043006", "status": "affected", "versionType": "git" }, { "version": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386", "lessThan": "7c9db92d5f0eadca30884af75c53d601edc512ee", "status": "affected", "versionType": "git" }, { "version": "f1b4e32aca0811aa011c76e5d6cf2fa19224b386", "lessThan": "dac5e6249159ac255dad9781793dbe5908ac9ddb", "status": "affected", "versionType": "git" }, { "version": "fbac09a3b8890003c0c55294c00709f3ae5501bb", "status": "affected", "versionType": "git" }, { "version": "edb4baffb9483141a50fb7f7146cfe4a4c0c2db8", "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" }, { "version": "5.10.238", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.185", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.141", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.93", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.31", "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" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.130", "versionEndExcluding": "5.10.238" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.54", "versionEndExcluding": "5.15.185" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.1.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.31" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.14.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.15" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.252" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18.11" } ] } ] } ], "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" } } ] } }