CVE-2026-89779 Affecting kernel-tools-devel package, versions <1:6.1.188-233.385.amzn2023
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN2023-KERNELTOOLSDEVEL-20869729
- published13 Oct 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-89779 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel-tools-devel to version 1:6.1.188-233.385.amzn2023 or higher.
This issue was patched in ALAS2023-2026-3197.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools-devel package and not the kernel-tools-devel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: validate ef->size covers the record's name and value
When an EA record has a non-zero ef->size, ntfs_read_ea() only checks that the record fits in the remaining buffer (ea_size > bytes), not that ef->size is large enough to hold the record's own name_len + 1 + elength.
A crafted image can pass validation with, e.g., ef->size = 24 but elength = 0xffff. ntfs_get_ea() then trusts elength and copies it out of the undersized record, reading past the kmalloc(info->size) allocation and leaking heap memory to userspace via getxattr():
BUG: KASAN: slab-out-of-bounds in ntfs_get_ea (fs/ntfs3/xattr.c:302) Read of size 65535 at addr ffff888100794550 by task exploit __asan_memcpy (mm/kasan/shadow.c:105) ntfs_get_ea (fs/ntfs3/xattr.c:302) ntfs_getxattr (fs/ntfs3/xattr.c:848) __vfs_getxattr (fs/xattr.c:441) vfs_getxattr (fs/xattr.c:474) do_getxattr (fs/xattr.c:800) path_getxattrat (fs/xattr.c:868) do_syscall_64 (arch/x86/entry/syscall_64.c:94)
The buggy address is located 80 bytes inside of allocated 84-byte region in cache kmalloc-96
Compute the size the record needs and require ef->size to cover it.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-89779
- https://git.kernel.org/stable/c/077df8464cf24f8ffc82fb6efec2ae600686e699
- https://git.kernel.org/stable/c/28a924c7e67e6d71abeb04860b61166fecb027fc
- https://git.kernel.org/stable/c/aab1880058ac767d3ea9388a9a7221c776c22c44
- https://git.kernel.org/stable/c/b27e68ad818a4ca2cef8f35f97e75d756714c818
- https://git.kernel.org/stable/c/c22f91d82cb9a29d22bdffdce6c803467984ad0c
- https://git.kernel.org/stable/c/c8a109c9e23a2c7fd548473dde728b2cb8188146
- https://git.kernel.org/stable/c/d585ed08308909c7e6fefb4e8a258aeb29b19ff9