CVE-2024-39497: drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)
First published: Fri Jul 12 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE) Lack of check for copy-on-write (COW) mapping in drm_gem_shmem_mmap allows users to call mmap with PROT_WRITE and MAP_PRIVATE flag causing a kernel panic due to BUG_ON in vmf_insert_pfn_prot: BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags)); Return -EINVAL early if COW mapping is detected. This bug affects all drm drivers using default shmem helpers. It can be reproduced by this simple example: void *ptr = mmap(0, size, PROT_WRITE, MAP_PRIVATE, fd, mmap_offset); ptr[0] = 0;
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.6.35 | 6.6.35 |
| redhat/kernel | <6.9.6 | 6.9.6 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-39497
- https://nvd.nist.gov/vuln/detail/CVE-2024-39497
- https://launchpad.net/bugs/cve/CVE-2024-39497
- https://security-tracker.debian.org/tracker/CVE-2024-39497
- https://ubuntu.com/security/CVE-2024-39497
- https://git.kernel.org/stable/c/03c71c42809ef4b17f5d874cdb2d3bf40e847b86
- https://git.kernel.org/stable/c/1b4a8b89bf6787090b56424d269bf84ba00c3263
- https://git.kernel.org/stable/c/2219e5f97244b79c276751a1167615b9714db1b0
- https://git.kernel.org/stable/c/39bc27bd688066a63e56f7f64ad34fae03fbe3b8
- https://git.kernel.org/stable/c/3ae63a8c1685e16958560ec08d30defdc5b9cca0
- https://git.kernel.org/stable/c/a508a102edf8735adc9bb73d37dd13c38d1a1b10
- https://git.kernel.org/linus/39bc27bd688066a63e56f7f64ad34fae03fbe3b8
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2297469
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