tcp: avoid too many retransmit packets
In the Linux kernel, the following vulnerability has been resolved: tcp: avoid too many retransmit packets If a TCP socket is using TCP_USER_TIMEOUT, and the other peer retracted its window to zero, tcp_retransmit_timer() can retransmit a packet every two jiffies (2 ms for HZ=1000), for about 4 minutes after TCP_USER_TIMEOUT has 'expired'. The fix is to make sure tcp_rtx_probe0_timed_out() takes icsk->icsk_user_timeout into account. Before blamed commit, the socket would not timeout after icsk->icsk_user_timeout, but would use standard exponential backoff for the retransmits. Also worth noting that before commit e89688e3e978 ("net: tcp: fix unexcepted socket die when snd_wnd is 0"), the issue would last 2 minutes instead of 4.
- Published
- Jul 15, 2024
- Updated
- Aug 5, 2026
- EPSS
- 0.8% · 54th percentile
- CWE
- —
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Report tools
Action score
13
Monitor
Low priority for now.
- CVSS
- 13 / 40 · 3.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.8%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 3.3
- CNA · Linux
- 7.5
- 4.2 point gap
CVSS:3.1/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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel4.19 and later · before 5.4.280
- linux linux kernel5.5 and later · before 5.10.222
- linux linux kernel5.11 and later · before 5.15.163
- linux linux kernel5.16 and later · before 6.1.100
- linux linux kernel6.2 and later · before 6.6.41
- linux linux kernel6.7 and later · before 6.9.10
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 4.19affected
- b701a99e431db784714c32fc6b68123045714679 and later · before 7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4affected · git
- b701a99e431db784714c32fc6b68123045714679 and later · before d2346fca5bed130dc712f276ac63450201d52969affected · git
- b701a99e431db784714c32fc6b68123045714679 and later · before 5d7e64d70a11d988553a08239c810a658e841982affected · git
- b701a99e431db784714c32fc6b68123045714679 and later · before 04317a2471c2f637b4c49cbd0e9c0d04a519f570affected · git
- b701a99e431db784714c32fc6b68123045714679 and later · before e113cddefa27bbf5a79f72387b8fbd432a61a466affected · git
- b701a99e431db784714c32fc6b68123045714679 and later · before dfcdd7f89e401d2c6616be90c76c2fac3fa98fdeaffected · git
- b701a99e431db784714c32fc6b68123045714679 and later · before 66cb64a1d2239cd0309f9b5038b05462570a5be1affected · git
- b701a99e431db784714c32fc6b68123045714679 and later · before 97a9063518f198ec0adb2ecb89789de342bb8283affected · git
- before 4.19not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:11 | linux | before 5.10.223-1 | 5.10.223-1 |
| Debian:12 | linux | before 6.1.106-1 | 6.1.106-1 |
| Debian:13 | linux | before 6.9.10-1 | 6.9.10-1 |
| Red Hat:rhel_eus:9.4::appstream | bpftool-debuginfo | before 0:7.3.0-427.47.1.el9_4 | 0:7.3.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-64k-debug-debuginfo | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-64k-debug-devel | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-64k-debug-devel-matched | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-64k-debuginfo | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-64k-devel | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-64k-devel-matched | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-debug-debuginfo | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-debug-devel | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-debug-devel-matched | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-debuginfo | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-debuginfo-common-aarch64 | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-debuginfo-common-ppc64le | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-debuginfo-common-s390x | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-debuginfo-common-x86_64 | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-devel | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-devel-matched | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-doc | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-rt-debug-debuginfo | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-rt-debuginfo | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
| Red Hat:rhel_eus:9.4::appstream | kernel-tools-debuginfo | before 0:5.14.0-427.47.1.el9_4 | 0:5.14.0-427.47.1.el9_4 |
+57
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
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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 |
|---|---|---|
| Linux Linux | 04317a2471c2f637b4c49cbd0e9c0d04a519f570 | Vendor (CNA) |
| Linux Linux | 5d7e64d70a11d988553a08239c810a658e841982 | Vendor (CNA) |
| Linux Linux | 66cb64a1d2239cd0309f9b5038b05462570a5be1 | Vendor (CNA) |
| Linux Linux | 7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4 | Vendor (CNA) |
| Linux Linux | 97a9063518f198ec0adb2ecb89789de342bb8283 | Vendor (CNA) |
| Linux Linux | d2346fca5bed130dc712f276ac63450201d52969 | Vendor (CNA) |
| Linux Linux | dfcdd7f89e401d2c6616be90c76c2fac3fa98fde | Vendor (CNA) |
| Linux Linux | e113cddefa27bbf5a79f72387b8fbd432a61a466 | Vendor (CNA) |
| azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 | 6.6.43.1-7 · CBL-Mariner Releases | Microsoft (MSRC) |
| azl3 kernel 6.6.43.1-7 on Azure Linux 3.0 | 6.6.43.1-7 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 kernel 5.15.162.2-1 on CBL Mariner 2.0 | 5.15.164.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 kernel 5.15.162.2-1 on CBL-Mariner 2.0 | 5.15.164.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 kernel 5.15.164.1-1 on CBL Mariner 2.0 | 5.15.164.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.106-1 · Debian:12 | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:7.3.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel-matched | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:kernel-debuginfo-common-aarch64 | 0:5.14.0-427.47.1.el9_4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-24-0942 · Jul 16, 2024(Linux Kernel Güncellemesi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- low · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/04317a2471c2f637b4c49cbd0e9c0d04a519f570
- git.kernel.org/stable/c/5d7e64d70a11d988553a08239c810a658e841982
- git.kernel.org/stable/c/66cb64a1d2239cd0309f9b5038b05462570a5be1
- git.kernel.org/stable/c/7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4
- git.kernel.org/stable/c/97a9063518f198ec0adb2ecb89789de342bb8283
- git.kernel.org/stable/c/d2346fca5bed130dc712f276ac63450201d52969
- git.kernel.org/stable/c/dfcdd7f89e401d2c6616be90c76c2fac3fa98fde
- git.kernel.org/stable/c/e113cddefa27bbf5a79f72387b8fbd432a61a466
- lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.