CVE-2024-26785
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-26785
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26785.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2024-26785
- Downstream
- Related
- Published
- 2024-04-04T08:20:18Z
- Modified
- 2025-10-21T19:15:04.785416Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- iommufd: Fix protection fault in iommufd_test_syz_conv_iova
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
iommufd: Fix protection fault in iommufdtestsyzconviova
Syzkaller reported the following bug:
general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7] Call Trace: lockacquire lockacquire+0x1ce/0x4f0 downread+0x93/0x4a0 iommufdtestsyzconviova+0x56/0x1f0 iommufdtestaccessrw.isra.0+0x2ec/0x390 iommufdtest+0x1058/0x1e30 iommufdfopsioctl+0x381/0x510 vfsioctl _dosysioctl _sesysioctl _x64sysioctl+0x170/0x1e0 dosyscallx64 dosyscall_64+0x71/0x140
This is because the new iommufdaccesschange_ioas() sets access->ioas to NULL during its process, so the lock might be gone in a concurrent racing context.
Fix this by doing the same access->ioas sanity as iommufdaccessrw() and iommufdaccesspin_pages() functions do.
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9227da7816dd1a42e20d41e2244cb63c205477caFixedfd4d5cd7a2e8f08357c9bfc0905957cffe8ce568
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9227da7816dd1a42e20d41e2244cb63c205477caFixedfc719ecbca45c9c046640d72baddba3d83e0bc0b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9227da7816dd1a42e20d41e2244cb63c205477caFixedcf7c2789822db8b5efa34f5ebcf1621bc0008d48