kernel: Use after free in tcp_xmit_retransmit_queue
Published Oct 16, 2016
5.5
MEDIUMCVSS 3.0
EPSS 1.18%
Description
The tcp_check_send_head function in include/net/tcp.h in the Linux kernel before 4.7.5 does not properly maintain certain SACK state after a failed data copy, which allows local users to cause a denial of service (tcp_xmit_retransmit_queue use-after-free and system crash) via a crafted SACK option.
Affected products
No data.
- ≤ 4.7.4
No data.
Red Hat Enterprise Linux 6
kernel-0:2.6.32-642.13.1.el6
Fixed · RHSA-2017:0036
Red Hat Enterprise Linux 7
kernel-0:3.10.0-514.6.1.el7
Fixed · RHSA-2017:0086
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-514.6.1.rt56.429.el7
Fixed · RHSA-2017:0091
Red Hat Enterprise MRG 2
kernel-rt-1:3.10.0-514.rt56.210.el6rt
Fixed · RHSA-2017:0113
Red Hat Enterprise Linux 5
kernel
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-642.13.1.el6 | Fixed | RHSA-2017:0036 |
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-514.6.1.el7 | Fixed | RHSA-2017:0086 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-514.6.1.rt56.429.el7 | Fixed | RHSA-2017:0091 |
| Red Hat Enterprise MRG 2 | kernel-rt-1:3.10.0-514.rt56.210.el6rt | Fixed | RHSA-2017:0113 |
| Red Hat Enterprise Linux 5 | kernel | Affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
AV:L/AC:L/Au:N/C:N/I:N/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 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.18% (0.01181) | 66.60th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.19% (0.01191) | 63.82th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.11% (0.00111) | 27.15th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00045) | 17.92th | v3 (v2023.03.01) |
| May 1, 2024 | 0.04% (0.00045) | 14.51th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00045) | 12.47th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.53% (0.03534) | 84.88th | v2 (v2022.01.01) |
| Feb 13, 2023 | 3.53% (0.03534) | 84.47th | v2 (v2022.01.01) |
| Feb 3, 2023 | 4.21% (0.04209) | 87.04th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.53% (0.03534) | 83.33th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.53% (0.03534) | 66.49th | v2 (v2022.01.01) |
References (15)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4 x_refsource_CONFIRMIssue TrackingPatch
- http://rhn.redhat.com/errata/RHSA-2017-0036.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2017-0086.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2017-0091.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2017-0113.html vendor-advisoryx_refsource_REDHAT
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5 x_refsource_CONFIRMRelease NotesThird Party Advisory
- http://www.openwall.com/lists/oss-security/2016/08/15/1 mailing-listx_refsource_MLISTExploitThird Party Advisory
- http://www.securityfocus.com/bid/92452 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2016-6828 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1367091 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4 x_refsource_CONFIRMIssue TrackingPatch
- https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2016-6828
- https://source.android.com/security/bulletin/2016-11-01.html x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2016-6828
Change history (0)
No recorded changes yet.