Vulnerability Details : CVE-2020-9391
An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on the AArch64 architecture. It ignores the top byte in the address passed to the brk system call, potentially moving the memory break downwards when the application expects it to move upwards, aka CID-dcde237319e6. This has been observed to cause heap corruption with the GNU C Library malloc implementation.
Vulnerability category: Memory Corruption
Products affected by CVE-2020-9391
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.4:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
- cpe:2.3:a:netapp:data_availability_services:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-9391
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 26 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-9391
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2020-9391
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-9391
-
https://bugzilla.redhat.com/show_bug.cgi?id=1797052
1797052 – CVE-2020-9391 kernel: brk discards top byte of addresses on aarch64, causing heap corruption in glibc mallocExploit;Issue Tracking;Patch;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2020/02/25/6
oss-security - CVE-2020-9391: Ignoring the top byte of addresses in brk causes heap corruption (AArch64)Exploit;Mailing List;Third Party Advisory
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dcde237319e626d1ec3c9d8b7613032f0fd4663a
kernel/git/torvalds/linux.git - Linux kernel source treeMailing List;Patch;Vendor Advisory
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https://security.netapp.com/advisory/ntap-20200313-0003/
February 2020 Linux Kernel Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O4LH35HOPBJIKYHYFXMBBM75DN75PZHZ/
[SECURITY] Fedora 31 Update: kernel-5.5.6-201.fc31 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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