Kernel: SCTP: use-after-free while traversing list of endpoint associations
Published Apr 1, 2019
7.8
HIGHCVSS 3.1
EPSS 1.13%
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.
Affected products
- Vendor n/a Product Linux Kernel Defaultn/a
- Version 4.19.x prior to 4.19.21StatusaffectedConstraints-
- Version 4.20.x prior to 4.20.8StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n/a | Linux Kernel | n/a |
|
Configuration 1
- ≥ 4.17 · < 4.19.21
- ≥ 4.20 · < 4.20.8
Configuration 2
- 18.04
- 18.10
No data.
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-alt
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise MRG 2
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-alt | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise MRG 2 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7, and Red Hat Enterprise MRG 2.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
AV:L/AC:L/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
2021-2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 1.13% (0.01129) | 65.23th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.13% (0.01129) | 62.06th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.42% (0.00421) | 59.92th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.05% (0.00052) | 22.38th | v3 (v2023.03.01) |
| Jun 7, 2024 | 0.05% (0.00052) | 20.40th | v3 (v2023.03.01) |
| Mar 25, 2024 | 0.05% (0.00052) | 18.39th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00045) | 12.06th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.09% (0.03090) | 83.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.09% (0.03090) | 82.11th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.09% (0.03090) | 64.78th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.82% (0.05819) | 80.57th | v1 |
| Jan 6, 2022 | 5.82% (0.05819) | 80.37th | v1 |
| Sep 1, 2021 | 5.82% (0.05819) | 89.04th | v1 |
| Apr 14, 2021 | 5.82% (0.05819) | 0.00th | v1 |
References (11)
- https://access.redhat.com/security/cve/CVE-2019-8956 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1679889 Issue Tracking
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.21 x_refsource_MISCRelease NotesVendor Advisory
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.8 x_refsource_MISCRelease NotesVendor Advisory
- https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ba59fb0273076637f0add4311faa990a5eec27c0 x_refsource_MISCMailing ListPatchVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-8956
- https://secuniaresearch.flexerasoftware.com/secunia_research/2019-5/ x_refsource_MISCBroken Link
- https://support.f5.com/csp/article/K12671141 x_refsource_CONFIRMThird Party Advisory
- https://usn.ubuntu.com/3930-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/3930-2/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-8956
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2019-8956 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1679889 | Issue Tracking | |
| https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.21 | x_refsource_MISCRelease NotesVendor Advisory | |
| https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.8 | x_refsource_MISCRelease NotesVendor Advisory | |
| https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ba59fb0273076637f0add4311faa990a5eec27c0 | x_refsource_MISCMailing ListPatchVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-8956 | ||
| https://secuniaresearch.flexerasoftware.com/secunia_research/2019-5/ | x_refsource_MISCBroken Link | |
| https://support.f5.com/csp/article/K12671141 | x_refsource_CONFIRMThird Party Advisory | |
| https://usn.ubuntu.com/3930-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://usn.ubuntu.com/3930-2/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2019-8956 |
Change history (0)
No recorded changes yet.