CVE-2026-68380: accel/amdxdna: Fix use-after-free of mm_struct in job scheduler
Greg Kroah-Hartman <[email protected]>
| Newsgroups | org.kernel.vger.linux-cve-announce |
|---|---|
| Message-ID | <2026081044-CVE-2026-68380-abce@gregkh> |
From: Greg Kroah-Hartman <[email protected]> Description =========== In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: Fix use-after-free of mm_struct in job scheduler amdxdna_cmd_submit() stores current->mm in job->mm without holding any reference. aie2_sched_job_run() later access job->mm from the DRM scheduler worker thread. With only a raw pointer and no structural reference, the mm_struct can be freed before the scheduler runs the job. Fix this by calling mmgrab() to hold a structural mm_count reference for the lifetime of the job, paired with mmdrop() in every cleanup path. The Linux kernel CVE team has assigned CVE-2026-68380 to this issue. Affected and fixed versions =========================== Issue introduced in 6.14 with commit aac243092b707bb3018e951d470cc1a9bcbaba6c and fixed in 6.18.42 with commit 6875ee2bef48f5d9f045d81a8a4d68893f768a8a Issue introduced in 6.14 with commit aac243092b707bb3018e951d470cc1a9bcbaba6c and fixed in 7.1.6 with commit e8fadbffc19a233d1eedebfb8df0f522d1388280 Issue introduced in 6.14 with commit aac243092b707bb3018e951d470cc1a9bcbaba6c and fixed in 7.2-rc4 with commit faebb7ba1ac65fa5810b640df02ce04e509fdc11 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-68380 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/accel/amdxdna/amdxdna_ctx.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/6875ee2bef48f5d9f045d81a8a4d68893f768a8a https://git.kernel.org/stable/c/e8fadbffc19a233d1eedebfb8df0f522d1388280 https://git.kernel.org/stable/c/faebb7ba1ac65fa5810b640df02ce04e509fdc11