CVE-2024-44947

Summary

In the Linux kernel, the following vulnerability has been resolved:

fuse: Initialize beyond-EOF page contents before setting uptodate

fuse_notify_store(), unlike fuse_do_readpage(), does not enable page zeroing (because it can be used to change partial page contents).

So fuse_notify_store() must be more careful to fully initialize page contents (including parts of the page that are beyond end-of-file) before marking the page uptodate.

The current code can leave beyond-EOF page contents uninitialized, which makes these uninitialized page contents visible to userspace via mmap().

This is an information leak, but only affects systems which do not enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the corresponding kernel command line parameter).

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa1d75f258230b75d46aecdf28b2e732413028863 < 49934861514d36d0995be8e81bb3312a499d8d9aaffected
LinuxLinuxa1d75f258230b75d46aecdf28b2e732413028863 < 33168db352c7b56ae18aa55c2cae1a1c5905d30eaffected
LinuxLinuxa1d75f258230b75d46aecdf28b2e732413028863 < 4690e2171f651e2b415e3941ce17f2f7b813aff6affected
LinuxLinuxa1d75f258230b75d46aecdf28b2e732413028863 < 8c78303eafbf85a728dd84d1750e89240c677dd9affected
LinuxLinuxa1d75f258230b75d46aecdf28b2e732413028863 < 831433527773e665bdb635ab5783d0b95d1246f4affected
LinuxLinuxa1d75f258230b75d46aecdf28b2e732413028863 < ac42e0f0eb66af966015ee33fd355bc6f5d80cd6affected
LinuxLinuxa1d75f258230b75d46aecdf28b2e732413028863 < 18a067240817bee8a9360539af5d79a4bf5398a5affected
LinuxLinuxa1d75f258230b75d46aecdf28b2e732413028863 < 3c0da3d163eb32f1f91891efaade027fa9b245b9affected
LinuxLinux2.6.36affected
LinuxLinux0 < 2.6.36unaffected
LinuxLinux4.19.321 <= 4.19.*unaffected
LinuxLinux5.4.283 <= 5.4.*unaffected
LinuxLinux5.10.225 <= 5.10.*unaffected
LinuxLinux5.15.166 <= 5.15.*unaffected
LinuxLinux6.1.107 <= 6.1.*unaffected
LinuxLinux6.6.48 <= 6.6.*unaffected
LinuxLinux6.10.7 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References