CVE-2019-11477: Integer overflow in TCP_SKB_CB(skb)->tcp_gso_segs
Noroxi assessment
Priority: This week (action score 60/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 98.7% (FIRST EPSS); higher than 99.9% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: linux (Debian:12) 4.19.37-4; linux (Debian:8) 3.16.68-2; linux-4.9 (Debian:8) 4.9.168-1+deb9u3~deb8u1.
- Mentioned 6 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Don’t wait for the next maintenance window. Upgrade to linux (Debian:12) 4.19.37-4; linux (Debian:8) 3.16.68-2; linux-4.9 (Debian:8) 4.9.168-1+deb9u3~deb8u1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.
- BDU:2019-02194
- DLA-1823-1
- DLA-1824-1
- DSA-4465-1
- openSUSE-SU-2019:1571-1
- openSUSE-SU-2019:1579-1
- RHSA-2019:1479
- RHSA-2019:1480
- RHSA-2019:1481
- RHSA-2019:1482
- RHSA-2019:1483
- RHSA-2019:1484
- RHSA-2019:1485
- RHSA-2019:1486
- RHSA-2019:1487
- RHSA-2019:1488
- RHSA-2019:1489
- RHSA-2019:1490
- RHSA-2019:1594
- RHSA-2019:1602
- Published
- Jun 18, 2019
- Updated
- Jun 16, 2026
- EPSS
- 98.7% · 99th percentile
- CWE
- CWE-190
Report tools
Action score
60
Don’t wait for the next maintenance window.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 30 / 30 · 98.7%
CNA vs NVD score
- NVD
- 7.5
- CNA · canonical
- 7.5
- agree
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| f5 | big-ip advanced firewall manager | cpe:2.3:a:f5:big-ip_advanced_firewall_manager |
| f5 | big-ip access policy manager | cpe:2.3:a:f5:big-ip_access_policy_manager |
| f5 | big-ip application acceleration manager | cpe:2.3:a:f5:big-ip_application_acceleration_manager |
| f5 | big-ip link controller | cpe:2.3:a:f5:big-ip_link_controller |
| f5 | big-ip policy enforcement manager | cpe:2.3:a:f5:big-ip_policy_enforcement_manager |
| f5 | big-ip webaccelerator | cpe:2.3:a:f5:big-ip_webaccelerator |
| f5 | big-ip application security manager | cpe:2.3:a:f5:big-ip_application_security_manager |
| f5 | big-ip local traffic manager | cpe:2.3:a:f5:big-ip_local_traffic_manager |
| f5 | big-ip fraud protection service | cpe:2.3:a:f5:big-ip_fraud_protection_service |
| f5 | big-ip global traffic manager | cpe:2.3:a:f5:big-ip_global_traffic_manager |
| f5 | big-ip analytics | cpe:2.3:a:f5:big-ip_analytics |
and 12 more
Versions reported by the vendor
Affected version ranges reported by the assigning authority (canonical). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux kernel
- 4.4 and later · before 4.4.182affected
- 4.9 and later · before 4.9.182affected
- 4.14 and later · before 4.14.127affected
- 4.19 and later · before 4.19.52affected
- 5.1 and later · before 5.1.11affected
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- ivanti connect secureall versions
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 4.19.37-4 | 4.19.37-4 |
| Debian:8 | linux | before 3.16.68-2 | 3.16.68-2 |
| Debian:8 | linux-4.9 | before 4.9.168-1+deb9u3~deb8u1 | 4.9.168-1+deb9u3~deb8u1 |
| Debian:9 | linux | before 4.9.168-1+deb9u3 | 4.9.168-1+deb9u3 |
| openSUSE:Leap 15.0 | kernel-debug | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.0 | kernel-default | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.0 | kernel-docs | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.0 | kernel-kvmsmall | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.0 | kernel-obs-build | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.0 | kernel-obs-qa | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.0 | kernel-source | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.0 | kernel-syms | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.0 | kernel-vanilla | before 4.12.14-lp150.12.64.1 | 4.12.14-lp150.12.64.1 |
| openSUSE:Leap 15.1 | kernel-debug | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| openSUSE:Leap 15.1 | kernel-default | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| openSUSE:Leap 15.1 | kernel-docs | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| openSUSE:Leap 15.1 | kernel-kvmsmall | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| openSUSE:Leap 15.1 | kernel-obs-build | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| openSUSE:Leap 15.1 | kernel-obs-qa | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| openSUSE:Leap 15.1 | kernel-source | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| openSUSE:Leap 15.1 | kernel-syms | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| openSUSE:Leap 15.1 | kernel-vanilla | before 4.12.14-lp151.28.7.1 | 4.12.14-lp151.28.7.1 |
| Red Hat:enterprise_linux:6::client | kernel | before 0:2.6.32-754.15.3.el6 | 0:2.6.32-754.15.3.el6 |
| Red Hat:enterprise_linux:6::client | kernel-abi-whitelists | before 0:2.6.32-754.15.3.el6 | 0:2.6.32-754.15.3.el6 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2019-10126Jun 14, 2019 · A flaw was found in the Linux kernel.41Plan
- ← EarlierCVE-2019-12881Jun 18, 2019 · i915_gem_userptr_get_pages in drivers/gpu/drm/i915/i915_gem_userptr.c in the Linux kernel 4.15.0 on Ubuntu 18.04.2 allows local users to…31Monitor
- Later →CVE-2019-11478Jun 18, 2019 · SACK can cause extensive memory use via fragmented resend queue58Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:linux | 4.19.37-4 · Debian:12 | Package registry (OSV) |
| debian:linux-4.9 | 4.9.168-1+deb9u3~deb8u1 · Debian:8 | Package registry (OSV) |
| opensuse:kernel-debug | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-default | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-docs | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-obs-build | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-source | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-syms | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| opensuse:kernel-vanilla | 4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:bpftool | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-abi-whitelists | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-core | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-core | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-modules | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-modules-extra | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| suse:kernel-azure | 4.4.180-4.31.1 · SUSE:Linux Enterprise Server 12 SP3 | Package registry (OSV) |
| suse:kernel-bigmem | 3.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
| suse:kernel-default | 3.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
| suse:kernel-ec2 | 3.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
| suse:kernel-pae | 3.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
| suse:kernel-ppc64 | 3.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
| suse:kernel-source | 3.0.101-108.95.1 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
+5
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:8 | 2019-07-22 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+33 d
- TodayNov 14, 2026+2705 d
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Jonathan LooneyNetflix
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-20-885 · Oct 26, 2020(Fujitsu Ürünleri Zafiyeti)
- TR-20-839 · Oct 14, 2020(Siemens Endüstriyel Ürünler Zafiyeti)
- TR-20-416 · Jun 10, 2020(Siemens Endüstriyel Ürünler Zafiyeti)
- TR-20-259 · Apr 22, 2020(Linux Kernel Güvenlik Güncellemesi)
- TR-20-005 · Jan 5, 2020(Huawei Ürünleri için Güvenlik Güncellemesi Yayınladı)
- TR-19-339 · Dec 26, 2019(Huawei Ürünleri için Güvenlik Güncellemesi Yayınladı)
Not on record for this CVE: EPSS history · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-190 · Integer Overflow or WraparoundCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- www.huawei.com/en/psirt/security-advisories/huawei-sa-20191225-01-kernel-en
- www.openwall.com/lists/oss-security/2019/06/20/3
- www.openwall.com/lists/oss-security/2019/06/28/2
- www.openwall.com/lists/oss-security/2019/07/06/3
- www.openwall.com/lists/oss-security/2019/07/06/4
- www.openwall.com/lists/oss-security/2019/10/24/1
- www.openwall.com/lists/oss-security/2019/10/29/3
- www.vmware.com/security/advisories/VMSA-2019-0010.html
- access.redhat.com/errata/RHSA-2019:1594
- access.redhat.com/errata/RHSA-2019:1602
- access.redhat.com/errata/RHSA-2019:1699
- access.redhat.com/security/vulnerabilities/tcpsack
- cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf
- git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=3b4929f65b0d8249f19a50245cd88ed1a2f78cff
- github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
- kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193
- kc.mcafee.com/corporate/index?page=content&id=SB10287
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0006
- security.netapp.com/advisory/ntap-20190625-0001/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.