{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38095", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.984Z", "datePublished": "2025-07-03T07:44:18.214Z", "dateUpdated": "2026-08-05T11:59:28.799Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:59:28.799Z" }, "descriptions": [ { "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." } ], "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 race is driven entirely through local ioctls on a dma-buf or DRM render-node file descriptor (DMA_BUF_IOCTL_IMPORT_SYNC_FILE / EXPORT_SYNC_FILE / SYNC, and DRM_RENDER_ALLOW submit/wait/busy ioctls). No network or remote peer input reaches dma_resv_add_fence().\nAC:L - The attacker controls both sides of the race — one thread adds fences via DMA_BUF_IOCTL_IMPORT_SYNC_FILE while another iterates them locklessly via EXPORT_SYNC_FILE/SYNC — 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 — an attacker-controlled function pointer — 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": "fe1bebd0edb22e3536cbc920ec713331d1367ad4", "status": "affected", "versionType": "git" }, { "version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "08680c4dadc6e736c75bc2409d833f03f9003c51", "status": "affected", "versionType": "git" }, { "version": "a590d0fdbaa56f482ff515e1040b6d9b1b200d63", "lessThan": "72c7d62583ebce7baeb61acce6057c361f73be4a", "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/dma-buf/dma-resv.c" ], "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.241", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.192", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.140", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.92", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.30", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14.8", "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": "5.0", "versionEndExcluding": "5.10.241" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.192" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.14.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f" }, { "url": "https://git.kernel.org/stable/c/d0b7f11dd68b593bd970e5735be00e8d89bace30" }, { "url": "https://git.kernel.org/stable/c/3becc659f9cb76b481ad1fb71f54d5c8d6332d3f" }, { "url": "https://git.kernel.org/stable/c/c9d2b9a80d06a58f37e0dc8c827075639b443927" }, { "url": "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" } } ] } }