CVE-2025-38095

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No network or remote peer input reaches dma_resv_add_fence().\nAC:L - The attacker controls both sides of the race \u2014 one thread adds fences via DMA_BUF_IOCTL_IMPORT_SYNC_FILE while another iterates them locklessly via EXPORT_SYNC_FILE/SYNC \u2014 pinning threads to separate CPUs and looping indefinitely, and can groom the slab so the uninitialized slot holds a chosen value. The equivalent race was already demonstrated by the unprivileged igt/gem_busy/close-race testcase producing a GPF with slab poison, and affected weakly-ordered arm64 hardware is mainstream, not a rare configuration.\nPR:L - Only an unprivileged local user is needed: a dma-buf fd from /dev/dma_heap (accessible to every Android app) or a DRM render node (world/render-group accessible on desktops and containers with GPU passthrough), and all the relevant DRM ioctls are marked DRM_RENDER_ALLOW.\nUI:N - The attacker's own two threads perform both the fence addition and the lockless iteration on its own file descriptors. No victim action of any kind is required.\nS:U - The corruption occurs in kernel memory within the same security authority as the attacking process; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The reader dereferences an uninitialized/stale slab slot as a struct dma_fence *, giving reads at attacker-groomable addresses, and the bogus fence can be wrapped into a sync_file fd whose SYNC_IOC_FILE_INFO returns kernel-memory-derived strings and fields to userspace. Stale slots may also hold already-released fence pointers, a classic use-after-free read.\nI:H - kref_get_unless_zero() on the wild pointer performs an atomic increment at an attacker-influenced kernel address, and the subsequent dma_fence_is_signaled() makes an indirect call through fence->ops->signaled \u2014 an attacker-controlled function pointer \u2014 providing both a write primitive and control-flow hijack potential.\nA:H - The documented manifestations are a NULL pointer dereference (per the commit message) and a general protection fault from dereferencing garbage heap data (per the Fixes: commit's oops log), both of which panic or oops the kernel. The race can be re-triggered in a loop for repeated denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dma-buf/dma-resv.c"], "versions": [{"version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f", "status": "affected", "versionType": "git"}, {"version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "d0b7f11dd68b593bd970e5735be00e8d89bace30", "status": "affected", "versionType": "git"}, {"version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "3becc659f9cb76b481ad1fb71f54d5c8d6332d3f", "status": "affected", "versionType": "git"}, {"version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "c9d2b9a80d06a58f37e0dc8c827075639b443927", "status": "affected", "versionType": "git"}, {"version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": 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"https://git.kernel.org/stable/c/fe1bebd0edb22e3536cbc920ec713331d1367ad4"}, {"url": "https://git.kernel.org/stable/c/08680c4dadc6e736c75bc2409d833f03f9003c51"}, {"url": "https://git.kernel.org/stable/c/72c7d62583ebce7baeb61acce6057c361f73be4a"}], "title": "dma-buf: insert memory barrier before updating num_fences", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:58:27.686Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-38095", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:47:18.378470Z"}}}], "title": "CISA ADP 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No network or remote peer input reaches dma_resv_add_fence().\nAC:L - The attacker controls both sides of the race \u2014 one thread adds fences via DMA_BUF_IOCTL_IMPORT_SYNC_FILE while another iterates them locklessly via EXPORT_SYNC_FILE/SYNC \u2014 pinning threads to separate CPUs and looping indefinitely, and can groom the slab so the uninitialized slot holds a chosen value. The equivalent race was already demonstrated by the unprivileged igt/gem_busy/close-race testcase producing a GPF with slab poison, and affected weakly-ordered arm64 hardware is mainstream, not a rare configuration.\nPR:L - Only an unprivileged local user is needed: a dma-buf fd from /dev/dma_heap (accessible to every Android app) or a DRM render node (world/render-group accessible on desktops and containers with GPU passthrough), and all the relevant DRM ioctls are marked DRM_RENDER_ALLOW.\nUI:N - The attacker's own two threads perform both the fence addition and the lockless iteration on its own file descriptors. No victim action of any kind is required.\nS:U - The corruption occurs in kernel memory within the same security authority as the attacking process; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The reader dereferences an uninitialized/stale slab slot as a struct dma_fence *, giving reads at attacker-groomable addresses, and the bogus fence can be wrapped into a sync_file fd whose SYNC_IOC_FILE_INFO returns kernel-memory-derived strings and fields to userspace. Stale slots may also hold already-released fence pointers, a classic use-after-free read.\nI:H - kref_get_unless_zero() on the wild pointer performs an atomic increment at an attacker-influenced kernel address, and the subsequent dma_fence_is_signaled() makes an indirect call through fence->ops->signaled \u2014 an attacker-controlled function pointer \u2014 providing both a write primitive and control-flow hijack potential.\nA:H - The documented manifestations are a NULL pointer dereference (per the commit message) and a general protection fault from dereferencing garbage heap data (per the Fixes: commit's oops log), both of which panic or oops the kernel. The race can be re-triggered in a loop for repeated denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f", "versionType": "git"}, {"status": "affected", "version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "d0b7f11dd68b593bd970e5735be00e8d89bace30", "versionType": "git"}, {"status": "affected", "version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "3becc659f9cb76b481ad1fb71f54d5c8d6332d3f", "versionType": "git"}, {"status": "affected", "version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "c9d2b9a80d06a58f37e0dc8c827075639b443927", "versionType": "git"}, {"status": "affected", "version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "fe1bebd0edb22e3536cbc920ec713331d1367ad4", "versionType": 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[{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf: insert memory barrier before updating num_fences\n\nsmp_store_mb() inserts memory barrier after storing operation.\nIt is different with what the comment is originally aiming so Null\npointer dereference can be happened if memory update is reordered."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dma-buf: inserta una barrera de memoria antes de actualizar num_fences. smp_store_mb() inserta una barrera de memoria despu\u00e9s de la operaci\u00f3n de almacenamiento. Esto difiere del objetivo original del comentario, por lo que puede producirse una desreferencia de puntero nulo si se reordena la actualizaci\u00f3n de memoria."}], "id": "CVE-2025-38095", "lastModified": "2026-10-15T22:18:26.540", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38095", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:47:18.378470Z", "version": "2.0.3"}}]}, "published": "2025-07-03T08:15:26.300", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08680c4dadc6e736c75bc2409d833f03f9003c51"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3becc659f9cb76b481ad1fb71f54d5c8d6332d3f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/72c7d62583ebce7baeb61acce6057c361f73be4a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c9d2b9a80d06a58f37e0dc8c827075639b443927"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d0b7f11dd68b593bd970e5735be00e8d89bace30"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe1bebd0edb22e3536cbc920ec713331d1367ad4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dma-buf: insert memory barrier before updating num_fences", "id": "2376026", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376026"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndma-buf: insert memory barrier before updating num_fences\nsmp_store_mb() inserts memory barrier after storing operation.\nIt is different with what the comment is originally aiming so Null\npointer dereference can be happened if memory update is reordered."], "name": "CVE-2025-38095", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38095\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38095\nhttps://lore.kernel.org/linux-cve-announce/2025070340-CVE-2025-38095-6596@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-06T22:16:21.088688+00:00", "updated": "2025-07-06T22:16:21.088735+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}