CVE-2019-8956: canonical ubuntu_linux Use After Free
CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2019-8956DEBIAN-CVE-2019-8956
Published 01-04-2019Last modified 04-08-2024
Vulnerability summary
CVE-2019-8956 is a high (CVSS 7.8) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 1.13% chance of exploitation in the next 30 days, higher than 65.8% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (NVD)EPSS score
1.13%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 01-04-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
In the Linux Kernel before versions 4.20.8 and 4.19.21 a use-after-free error in the "sctp_sendmsg()" function (net/sctp/socket.c) when handling SCTP_SENDALL flag can be exploited to corrupt memory.
CVSS metrics
5 scores · 3 sources · 3 versionsHigh 7.8Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
High 7.8Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesSingle source
High 7.2Preferred score · NVD (NIST)
AV:L/AC:L/Au:N/C:C/I:C/A:CSourcesSingle source
EPSS trend
Probability
1.13%
Chance of exploitation in the next 30 days
Percentile
66%
Versus all other CVEs
30-day change
0.00 pp
From 1.13% on 19-09-2026
19-09-202619-10-2026
EPSS score1.13%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Ubuntu3 products
- linux-azure< 4.18.0-1014.14~18.04.1
- linux-gcp-edge< 4.18.0-1008.9~18.04.1
- linux-hwe< 4.18.0-17.18~18.04.1
Canonical1 product
- ubuntu_linuxEOL18.04 | 18.10
Debian1 product
- linux< 4.19.28-1
Linux1 product
- linux_kernel≥ 4.17, < 4.19.21 | ≥ 4.20, < 4.20.8
Unknown1 product
- linux kernel4.20.x prior to 4.20.8 | 4.19.x prior to 4.19.21
5 vendors · 7 products
