CVE-2025-38595xen: fix UAF in dmabuf_exp_from_pages()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: xen: fix UAF in dmabuf_exp_from_pages() [dma_buf_fd() fixes; no preferences regarding the tree it goes through - up to xen folks] As soon as we'd inserted a file reference into descriptor table, another thread could close it. That's fine for the case when all we are doing is returning that descriptor to userland (it's a race, but it's a userland race and there's nothing the kernel can do about it). However, if we follow fd_install() with any kind of access to objects that would be destroyed on close (be it the struct file itself or anything destroyed by its ->release()), we have a UAF. dma_buf_fd() is a combination of reserving a descriptor and fd_install(). gntdev dmabuf_exp_from_pages() calls it and then proceeds to access the objects destroyed on close - starting with gntdev_dmabuf itself. Fix that by doing reserving descriptor before anything else and do fd_install() only when everything had been set up.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 21, 2026
- First seen by InfoSec Signals
- Oct 21, 2026
Affected products
Linux Linux linux:linux (from the name) | from a240d6e42e28c34fdc34b3a98ca838a31c939901 before ba8bc644f168509c16d48444991de7cfea3f12ec; from a240d6e42e28c34fdc34b3a98ca838a31c939901 before e5907885260401bba300d4d18d79875c05b82651; from a240d6e42e28c34fdc34b3a98ca838a31c939901 before 3edfd2353f301bfffd5ee41066e37320a59ccc2d; from a240d6e42e28c34fdc34b3a98ca838a31c939901 before d59d49af4aeed9a81e673e37c26c6a3bacf1a181; from a240d6e42e28c34fdc34b3a98ca838a31c939901 before 532c8b51b3a8676cbf533a291f8156774f30ea87 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.19 before 6.12.42; from 6.13 before 6.15.10; from 6.16 before 6.16.1 | NVD |
References
- https://git.kernel.org/stable/c/ba8bc644f168509c16d48444991de7cfea3f12ec
- https://git.kernel.org/stable/c/e5907885260401bba300d4d18d79875c05b82651patch
- https://git.kernel.org/stable/c/3edfd2353f301bfffd5ee41066e37320a59ccc2dpatch
- https://git.kernel.org/stable/c/d59d49af4aeed9a81e673e37c26c6a3bacf1a181patch
- https://git.kernel.org/stable/c/532c8b51b3a8676cbf533a291f8156774f30ea87patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.