CVE-2025-39740 (GCVE-0-2025-39740)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:52 – Updated: 2026-08-05 12:04
VLAI
Title
drm/xe/migrate: prevent potential UAF
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/xe/migrate: prevent potential UAF If we hit the error path, the previous fence (if there is one) has already been put() prior to this, so doing a fence_wait could lead to UAF. Tweak the flow to do to the put() until after we do the wait. (cherry picked from commit 9b7ca35ed28fe5fad86e9d9c24ebd1271e4c9c3e)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 270172f64b114451876c1b68912653e72ab99f38 , < 7e46fa64a4b94208563c3a5bf1d7f4346f94abea (git)
Affected: 270172f64b114451876c1b68912653e72ab99f38 , < 145832fbdd17b1d77ffd6cdd1642259e101d1b7e (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "programFiles": [
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              "value": "AV:L - The vulnerable loop is reached only through a local userspace mapping of an Intel Xe VRAM buffer object accessed via ptrace//proc/pid/mem/process_vm_readv, or via the local devcoredump snapshot path after a GPU hang. There is no network or adjacent-network exposure.\nAC:L - The attacker deterministically forces multiple loop iterations by choosing the access offset/length against a fragmented VRAM BO (or a large VM snapshot), and forces the error path by saturating the fixed-size kernel_bb_pool and signalling the waiting thread, since drm_suballoc_insert waits interruptibly and returns -ERESTARTSYS. Concurrent migrate traffic that replaces m-\u003efence and drops the last reference is likewise generated by the attacker\u0027s own GPU submissions.\nPR:L - Only an unprivileged local user with DRM render-node access (render group, logged-in desktop user, or Android graphics group) is needed to create and mmap a VRAM BO and ptrace its own process. No root, capability, or namespace escalation is required.\nUI:N - The attacker performs the BO creation, mapping, GPU load generation, and the triggering remote-memory access entirely within its own processes. No action by any other user is required.\nS:U - The freed dma_fence and any resulting corruption stay within the host kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - dma_fence_wait() on the freed fence dereferences fence-\u003eops, fence-\u003elock and fence-\u003eseqno from reclaimed slab memory, and the attacker can refill that slot with objects of its choosing by submitting more scheduler jobs, yielding an arbitrary kernel-memory read primitive.\nI:H - The same wait path writes into the freed object (list_add on cb_list, setting the ENABLE_SIGNAL flag) and performs an indirect call through fence-\u003eops, so a heap-sprayed replacement gives both a write primitive and control-flow hijack leading to privilege escalation.\nA:H - Even without successful exploitation the use-after-free reliably produces a KASAN splat/oops, and waiting on a fence that will never signal hangs the calling task while holding the BO reservation, denying service."
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    "dateReserved": "2025-04-16T07:20:57.120Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/migrate: prevent potential UAF\n\nIf we hit the error path, the previous fence (if there is one) has\nalready been put() prior to this, so doing a fence_wait could lead to\nUAF. Tweak the flow to do to the put() until after we do the wait.\n\n(cherry picked from commit 9b7ca35ed28fe5fad86e9d9c24ebd1271e4c9c3e)"
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/xe/migrate: prevenir UAF potencial\n\nSi alcanzamos la ruta de error, la anterior fence (si hay una) ya ha sido put() antes de esto, por lo que realizar un fence_wait podr\u00eda llevar a UAF. Ajustar el flujo para que el put() se realice despu\u00e9s de la espera.\n\n(extra\u00eddo del commit 9b7ca35ed28fe5fad86e9d9c24ebd1271e4c9c3e)"
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}



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