CVE-2021-47218
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,…
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.