CVE-2024-41007 (GCVE-0-2024-41007)
Vulnerability from cvelistv5 – Published: 2024-07-15 08:48 – Updated: 2026-08-05 11:34
VLAI
EPSS
VEX
Title
tcp: avoid too many retransmit packets
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:00 UTC
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b701a99e431db784714c32fc6b68123045714679 , < 7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4
(git)
Affected: b701a99e431db784714c32fc6b68123045714679 , < d2346fca5bed130dc712f276ac63450201d52969 (git) Affected: b701a99e431db784714c32fc6b68123045714679 , < 5d7e64d70a11d988553a08239c810a658e841982 (git) Affected: b701a99e431db784714c32fc6b68123045714679 , < 04317a2471c2f637b4c49cbd0e9c0d04a519f570 (git) Affected: b701a99e431db784714c32fc6b68123045714679 , < e113cddefa27bbf5a79f72387b8fbd432a61a466 (git) Affected: b701a99e431db784714c32fc6b68123045714679 , < dfcdd7f89e401d2c6616be90c76c2fac3fa98fde (git) Affected: b701a99e431db784714c32fc6b68123045714679 , < 66cb64a1d2239cd0309f9b5038b05462570a5be1 (git) Affected: b701a99e431db784714c32fc6b68123045714679 , < 97a9063518f198ec0adb2ecb89789de342bb8283 (git) |
guessed | |
| Linux | Linux |
Affected:
4.19
Unaffected: 0 , < 4.19 (semver) Unaffected: 4.19.318 , ≤ 4.19.* (semver) Unaffected: 5.4.280 , ≤ 5.4.* (semver) Unaffected: 5.10.222 , ≤ 5.10.* (semver) Unaffected: 5.15.163 , ≤ 5.15.* (semver) Unaffected: 6.1.100 , ≤ 6.1.* (semver) Unaffected: 6.6.41 , ≤ 6.6.* (semver) Unaffected: 6.9.10 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
guessed |
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"current_release_date": "2026-02-18T01:46:25.000Z",
"cve": "CVE-2024-41007",
"id": "msrc_CVE-2024-41007",
"initial_release_date": "2024-07-01T07:00:00.000Z",
"product_status:fixed": "5",
"product_status:known_affected": "5",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "tcp: avoid too many retransmit packets",
"url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-41007.json",
"version": "3"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2024-41007\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-15T09:15:02.803\",\"lastModified\":\"2026-08-04T11:19:15.000\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp: avoid too many retransmit packets\\n\\nIf a TCP socket is using TCP_USER_TIMEOUT, and the other peer\\nretracted its window to zero, tcp_retransmit_timer() can\\nretransmit a packet every two jiffies (2 ms for HZ=1000),\\nfor about 4 minutes after TCP_USER_TIMEOUT has \u0027expired\u0027.\\n\\nThe fix is to make sure tcp_rtx_probe0_timed_out() takes\\nicsk-\u003eicsk_user_timeout into account.\\n\\nBefore blamed commit, the socket would not timeout after\\nicsk-\u003eicsk_user_timeout, but would use standard exponential\\nbackoff for the retransmits.\\n\\nAlso worth noting that before commit e89688e3e978 (\\\"net: tcp:\\nfix unexcepted socket die when snd_wnd is 0\\\"), the issue\\nwould last 2 minutes instead of 4.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp: evitar demasiados paquetes de retransmisi\u00f3n Si un socket TCP est\u00e1 usando TCP_USER_TIMEOUT y el otro par retrajo su ventana a cero, tcp_retransmit_timer() puede retransmitir un paquete cada dos santiam\u00e9n (2 ms). para HZ=1000), durante aproximadamente 4 minutos despu\u00e9s de que TCP_USER_TIMEOUT haya \u0027expirado\u0027. La soluci\u00f3n es asegurarse de que tcp_rtx_probe0_timed_out() tenga en cuenta icsk-\u0026gt;icsk_user_timeout. Antes de el commit culpable, el socket no expiraba despu\u00e9s de icsk-\u0026gt;icsk_user_timeout, sino que usaba un retroceso exponencial est\u00e1ndar para las retransmisiones. Tambi\u00e9n vale la pena se\u00f1alar que antes de commit e89688e3e978 (\\\"net: tcp: fix unexcepted socket die cuando snd_wnd es 0\\\"), el problema durar\u00eda 2 minutos en lugar de 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"cve": "CVE-2024-41007",
"id": "CVE-2024-41007",
"initial_release_date": "2024-07-15T00:00:00+00:00",
"product_status:fixed": "709",
"product_status:known_affected": "64",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: tcp: avoid too many retransmit packets",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-41007.json",
"version": "3"
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"cve": "CVE-2024-41007",
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"initial_release_date": "2024-07-16T02:33:41Z",
"product_status:known_affected": "489",
"product_status:known_not_affected": "139",
"product_status:recommended": "700",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2024-41007",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-41007.json",
"version": "76"
},
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Any remote TCP peer of a socket with TCP_USER_TIMEOUT set (NFS client transports, ocfs2, BPF-sockops-configured connections, gRPC/Envoy/HAProxy/Redis servers) can trigger it.\\nAC:L - The attacker fully controls the trigger \\u2014 shrink the receive window to zero (stop reading, or use a custom stack) and keep ACKing the zero-window probes to keep tp-\u003ercv_tstamp fresh so tcp_rtx_probe0_timed_out() never aborts. No race, timing luck, or memory-layout dependency; TCP_USER_TIMEOUT being set is a common attacker-independent deployment property (sunrpc sets it unconditionally), i.e. part of the vulnerable configuration.\\nPR:N - No authentication or credentials are required \\u2014 establishing a TCP connection and getting unacked data in flight (e.g. a banner or a pre-auth response) is sufficient. Locally the same condition is reachable by any unprivileged user via setsockopt(TCP_USER_TIMEOUT), which has no capability check.\\nUI:N - The packet storm is generated autonomously by the kernel retransmit timer once the peer advertises a zero window. No action by any local user or administrator is needed.\\nS:U - The CPU, softirq and network-bandwidth exhaustion stay within the affected host\u0027s own security authority. No privilege or virtualization boundary is crossed.\\nC:N - The bug only causes excessive retransmission of data already queued for and destined to that same peer \\u2014 no out-of-bounds read, uninitialized memory, or kernel-pointer exposure. The only extra output is an already-existing net_dbg_ratelimited() message.\\nI:N - There is no memory corruption, out-of-bounds write, or type confusion; the emitted packets are legitimate, correctly-formed retransmissions. No kernel or user data is modified.\\nA:H - tcp_clamp_rto_to_user_timeout() pins the retransmit timer to 1 jiffy, producing 500\\u20131000 packets/sec per socket, each with a tcp_enter_loss() and a __sk_dst_reset() route lookup, and a peer that keeps ACKing probes makes this unbounded in time rather than the 4 minutes noted in the changelog. Scaled across many connections this is a sustained, unauthenticated CPU and link-saturation denial of service, and the socket also silently ignores the TCP_USER_TIMEOUT the application relies on for failure detection.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b701a99e431db784714c32fc6b68123045714679\", \"lessThan\": \"7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b701a99e431db784714c32fc6b68123045714679\", \"lessThan\": \"d2346fca5bed130dc712f276ac63450201d52969\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b701a99e431db784714c32fc6b68123045714679\", \"lessThan\": \"5d7e64d70a11d988553a08239c810a658e841982\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b701a99e431db784714c32fc6b68123045714679\", \"lessThan\": \"04317a2471c2f637b4c49cbd0e9c0d04a519f570\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b701a99e431db784714c32fc6b68123045714679\", \"lessThan\": \"e113cddefa27bbf5a79f72387b8fbd432a61a466\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b701a99e431db784714c32fc6b68123045714679\", \"lessThan\": \"dfcdd7f89e401d2c6616be90c76c2fac3fa98fde\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b701a99e431db784714c32fc6b68123045714679\", \"lessThan\": \"66cb64a1d2239cd0309f9b5038b05462570a5be1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b701a99e431db784714c32fc6b68123045714679\", \"lessThan\": \"97a9063518f198ec0adb2ecb89789de342bb8283\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/tcp_timer.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.19\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.19\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.318\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.280\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.222\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.163\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.100\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.41\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/tcp_timer.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4\"}, {\"url\": \"https://git.kernel.org/stable/c/d2346fca5bed130dc712f276ac63450201d52969\"}, {\"url\": \"https://git.kernel.org/stable/c/5d7e64d70a11d988553a08239c810a658e841982\"}, {\"url\": \"https://git.kernel.org/stable/c/04317a2471c2f637b4c49cbd0e9c0d04a519f570\"}, {\"url\": \"https://git.kernel.org/stable/c/e113cddefa27bbf5a79f72387b8fbd432a61a466\"}, {\"url\": \"https://git.kernel.org/stable/c/dfcdd7f89e401d2c6616be90c76c2fac3fa98fde\"}, {\"url\": \"https://git.kernel.org/stable/c/66cb64a1d2239cd0309f9b5038b05462570a5be1\"}, {\"url\": \"https://git.kernel.org/stable/c/97a9063518f198ec0adb2ecb89789de342bb8283\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp: avoid too many retransmit packets\\n\\nIf a TCP socket is using TCP_USER_TIMEOUT, and the other peer\\nretracted its window to zero, tcp_retransmit_timer() can\\nretransmit a packet every two jiffies (2 ms for HZ=1000),\\nfor about 4 minutes after TCP_USER_TIMEOUT has \u0027expired\u0027.\\n\\nThe fix is to make sure tcp_rtx_probe0_timed_out() takes\\nicsk-\u003eicsk_user_timeout into account.\\n\\nBefore blamed commit, the socket would not timeout after\\nicsk-\u003eicsk_user_timeout, but would use standard exponential\\nbackoff for the retransmits.\\n\\nAlso worth noting that before commit e89688e3e978 (\\\"net: tcp:\\nfix unexcepted socket die when snd_wnd is 0\\\"), the issue\\nwould last 2 minutes instead of 4.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.318\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.280\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.222\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.163\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.100\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.41\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.10\", \"versionStartIncluding\": \"4.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"4.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:34:33.523Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-41007\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:34:33.523Z\", \"dateReserved\": \"2024-07-12T12:17:45.610Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-15T08:48:10.174Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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