{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-21934","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-12-29T08:45:45.789Z","datePublished":"2025-04-01T15:41:02.804Z","dateUpdated":"2026-08-05T11:55:27.199Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:55:27.199Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrapidio: fix an API misues when rio_add_net() fails\n\nrio_add_net() calls device_register() and fails when device_register()\nfails.  Thus, put_device() should be used rather than kfree().  Add\n\"mport->net = NULL;\" to avoid a use after free issue."}],"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 vulnerability is reached only through the RIO_DEV_ADD ioctl on the local character device /dev/rio_mportN, which requires local access to the system. RapidIO is a board-level fabric interconnect, not an IP network path, so no remote or adjacent reachability exists.\nAC:L - The attacker controls both sides of the unlocked mport->net race: two concurrent RIO_DEV_ADD ioctls both allocate a net and both register a device named \"rnet_<id>\" under the same parent, so the loser's device_register() fails deterministically with -EEXIST, and the sequence is freely retryable. Reclaiming the freed struct rio_net (which embeds a full struct device, landing in a common kmalloc cache) via standard heap spray is routine.\nPR:L - The driver performs no capable() or permission check on any ioctl path — access is gated purely by /dev/rio_mportN node permissions, and RapidIO deployments commonly delegate fabric enumeration to non-root userspace management daemons via group-accessible device nodes. An unprivileged user with access to the mport device node can fully drive the bug.\nUI:N - Exploitation is entirely self-driven through ioctl calls by the attacker's own process; no victim action, mount, or file open by another user is needed.\nS:U - The freed object, the corruption, and the resulting privilege gain all live within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The dangling mport->net is used as a struct device parent and list head, so after slab reclamation the attacker can leak kernel pointers written back into the sprayed object and dereference attacker-influenced sysfs/kobject pointers, yielding arbitrary kernel memory disclosure.\nI:H - list_add_tail(&rdev->net_list, &rdev->net->devices) inserts into a freed, attacker-reclaimed list head, giving a controllable write-what-where primitive, and device_add() increments a refcount inside the freed object — both leverageable into arbitrary kernel memory write and control-flow hijack.\nA:H - Even without full exploitation, the use-after-free on mport->net and the subsequent double free via rio_free_net()/device_unregister() on freed memory reliably produce slab corruption, oops, or kernel panic."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/rapidio/devices/rio_mport_cdev.c"],"versions":[{"version":"e8de370188d098bb49483c287b44925957c3c9b6","lessThan":"d4ec862ce80f64db923a1d942b5d11cf6fc87d36","status":"affected","versionType":"git"},{"version":"e8de370188d098bb49483c287b44925957c3c9b6","lessThan":"88ddad53e4cfb6de861c6d4fb7b25427f46baed5","status":"affected","versionType":"git"},{"version":"e8de370188d098bb49483c287b44925957c3c9b6","lessThan":"cdd9f58f7fe41a55fae4305ea51fc234769fd466","status":"affected","versionType":"git"},{"version":"e8de370188d098bb49483c287b44925957c3c9b6","lessThan":"a5f5e520e8fbc6294020ff8afa36f684d92c6e6a","status":"affected","versionType":"git"},{"version":"e8de370188d098bb49483c287b44925957c3c9b6","lessThan":"2537f01d57f08c527e40bbb5862aa6ff43344898","status":"affected","versionType":"git"},{"version":"e8de370188d098bb49483c287b44925957c3c9b6","lessThan":"22e4977141dfc6d109bf29b495bf2187b4250990","status":"affected","versionType":"git"},{"version":"e8de370188d098bb49483c287b44925957c3c9b6","lessThan":"f0aa4ee1cbbf7789907e5a3f6810de01c146c211","status":"affected","versionType":"git"},{"version":"e8de370188d098bb49483c287b44925957c3c9b6","lessThan":"b2ef51c74b0171fde7eb69b6152d3d2f743ef269","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/rapidio/devices/rio_mport_cdev.c"],"versions":[{"version":"4.6","status":"affected"},{"version":"0","lessThan":"4.6","status":"unaffected","versionType":"semver"},{"version":"5.4.291","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.235","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.179","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.131","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.83","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.19","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.13.7","lessThanOrEqual":"6.13.*","status":"unaffected","versionType":"semver"},{"version":"6.14","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":"4.6","versionEndExcluding":"5.4.291"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"5.10.235"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"5.15.179"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.1.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.6.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.12.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.13.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/d4ec862ce80f64db923a1d942b5d11cf6fc87d36"},{"url":"https://git.kernel.org/stable/c/88ddad53e4cfb6de861c6d4fb7b25427f46baed5"},{"url":"https://git.kernel.org/stable/c/cdd9f58f7fe41a55fae4305ea51fc234769fd466"},{"url":"https://git.kernel.org/stable/c/a5f5e520e8fbc6294020ff8afa36f684d92c6e6a"},{"url":"https://git.kernel.org/stable/c/2537f01d57f08c527e40bbb5862aa6ff43344898"},{"url":"https://git.kernel.org/stable/c/22e4977141dfc6d109bf29b495bf2187b4250990"},{"url":"https://git.kernel.org/stable/c/f0aa4ee1cbbf7789907e5a3f6810de01c146c211"},{"url":"https://git.kernel.org/stable/c/b2ef51c74b0171fde7eb69b6152d3d2f743ef269"}],"title":"rapidio: fix an API misues when rio_add_net() fails","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2025-21934","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2025-10-01T19:22:15.227028Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-416","description":"CWE-416 Use After Free"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-10-01T19:26:33.096Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T19:39:30.684Z"}}]}}