iommu/vt-d: Avoid NULL pointer dereference or refcount corruption
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.12.114, 6.14, 6.18.33, 7.0.10
- 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
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Avoid NULL pointer dereference or refcount corruption Commit 60f030f7418d ("iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE") fixed a NULL pointer dereference in an unlikely situation partly. If dev_pasid is not found in the dev_pasids list, it remains NULL. However, the teardown operations are executed unconditionally, this lead to a NULL pointer dereference or refcount corruption. If the domain was never attached to this IOMMU, info will be NULL, which would cause an immediate dereference when checking --info->refcnt. Even if info is not NULL, decrementing the refcount without having removed a valid PASID might unbalance the count. This could lead to premature dropping of the refcount to 0, potentially causing a use-after-free for the remaining active devices sharing the domain. Fix it by returning early if dev_pasid is NULL, before executing the teardown operations. Issue found by AI review and suggested by Kevin Tian. https://sashiko.dev/#/patchset/20260421031347.1408890-1-zhenzhong.duan%40intel.com
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 68ec78beb4a3fb0877cbaaf49758c85410c05977 · fixed in d1a677f9c5e02c4ae49614044ac21296660d1391; From 60f030f7418d3f1d94f2fb207fe3080e1844630b · fixed in 9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153; From 60f030f7418d3f1d94f2fb207fe3080e1844630b · fixed in cdfe3c9f2c9e28a8651ee463c88ad191ced2f840; From 60f030f7418d3f1d94f2fb207fe3080e1844630b · fixed in 79ea2feb917b05366b49d85573c9c5331f043b2c; From 6.12.57 · fixed in 6.12.114; From 6.13.3 · fixed in 6.14
- Linux Linux
6.14
- KernelLinux
fixed in 6.12.114; From 6.13.0 · fixed in 6.18.33; From 6.14.0 · fixed in 7.0.10