Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: selinux: fix NULL-pointer dereference when hashtab allocation fails When the hash table slot array allocation fails in hashtab_init(), h->size is left initialized with a non-zero value, but the h->htable pointer is NULL. This may then cause a NULL pointer dereference, since the policydb code relies on the assumption that even after a failed hashtab_init(), hashtab_map() and hashtab_destroy() can be safely called on it. Yet, these detect an empty hashtab only by looking at the size. Fix this by making sure that hashtab_init() always leaves behind a valid empty hashtab when the allocation fails.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.8, < 5.10.82 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79Patch
- https://git.kernel.org/stable/c/b17dd53cac769dd13031b0ca34f90cc65e523fabPatch
- https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818bPatch
- https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79Patch
- https://git.kernel.org/stable/c/b17dd53cac769dd13031b0ca34f90cc65e523fabPatch
- https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818bPatch
FAQ
What is CVE-2021-47218?
CVE-2021-47218 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: selinux: fix NULL-pointer dereference when hashtab allocation fails When the hash table slot array allocation fails in hashtab_ini...
How severe is CVE-2021-47218?
CVE-2021-47218 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47218?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.