accel/amxdna: Fix page-insertion errors in amdxdna_insert_pages()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.18.57, 7.1.9
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: accel/amxdna: Fix page-insertion errors in amdxdna_insert_pages() Two error paths in amdxdna_insert_pages() called vma->vm_ops->close(vma) before returning an error code to the caller. This is incorrect: amdxdna_gem_obj_mmap() registers an HMM interval notifier before calling amdxdna_insert_pages(), and on a hard error it jumps to hmm_unreg to undo that registration. Calling vm_ops->close() manually — which drops the shmem pages_pin_count and the GEM object reference that backs the VMA — before the mmap syscall has even returned causes those resources to be released while the VMA is still alive. The kernel VMA teardown will call vm_ops->close() a second time when the process later unmaps the range, producing a reference count underflow. Replace both hard-error returns with a deferred-fault approach that keeps the VMA alive and retries page insertion through the HMM range-fault path.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From e486147c912f653ef4b60a6c7dbd4168a4c56a9f · fixed in b3d05a335cbd3d89538e9dde1621dccf33ae945a; From e486147c912f653ef4b60a6c7dbd4168a4c56a9f · fixed in 1501e4d07c6fee0d50531a0d1cb2be01a63e6e75; From e486147c912f653ef4b60a6c7dbd4168a4c56a9f · fixed in 8d51e0fd3e698919d2adeff71936377f0c0d4aa0
- Linux Linux
6.16
- KernelLinux
From 6.16.0 · fixed in 6.18.57; From 6.19.0 · fixed in 7.1.9