CVE-2026-74662
inet: frags: publish queues before arming timer
Description
In the Linux kernel, the following vulnerability has been resolved: inet: frags: publish queues before arming timer inet_frag_create() arms the fragment queue timer before inserting the queue into the fqdir rhashtable. If the namespace fragment timeout is zero or negative, the timer can run before the queue is published. The timer callback then marks the queue complete, tries to remove a node that is not in the hash table yet, and drops the anticipated hash reference. Creation can subsequently publish the completed queue without restoring that reference, leaving a stale hash node after the caller drops the remaining reference. Publish the queue first and arm the timer while holding the queue lock. This makes timer expiry wait until the queue is visible in the hash table, so inet_frag_kill() can remove the node and balance the hash reference.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Aug. 27, 2026, 1:18 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Publish the queue before arming the timer.
- Arm the timer while holding the queue lock.
- Ensure timer expiry waits for queue visibility.
- Balance the hash reference correctly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74662.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74662 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74662
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74662 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74662 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 27, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74662.json">CVE-2026-74662</a> Added Reference https://git.kernel.org/stable/c/08a04d7bfb9c103432561aff8a62b6872e694a6a Added Reference https://git.kernel.org/stable/c/39c6c4b267b65f00e0b0335a2ae00cbe9e3174f0 Added Reference https://git.kernel.org/stable/c/4ed0681dc2c1e0538b79d2fc56190ffcb369dacd Added Reference https://git.kernel.org/stable/c/653d7ddf6cba867777a3d14c4f83ace008c5ad13 Added Reference https://git.kernel.org/stable/c/928128865e43b197e30688dc1bc991592c97edcf Added Reference https://git.kernel.org/stable/c/9f904dd3e455750e5d4ec9b2f134835811b85a2f Added Reference https://git.kernel.org/stable/c/d3ffb89b2944672cf7bdd8e9ee577d2043b4a956 Added Reference https://git.kernel.org/stable/c/f4e4dab62181b7fe7c011bed6fbef9fc3d48c769 Removed Reference https://git.kernel.org/stable/c/653d7ddf6cba867777a3d14c4f83ace008c5ad13 Removed Reference https://git.kernel.org/stable/c/928128865e43b197e30688dc1bc991592c97edcf Removed Reference https://git.kernel.org/stable/c/9f904dd3e455750e5d4ec9b2f134835811b85a2f -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '648700f76b03b7e8149d13cc2bdb3355035258a9', 'lessThan': '9f904dd3e455750e5d4ec9b2f134835811b85a2f', 'versionType': 'git'}, {'status': 'affected', 'version': '648700f76b03b7e8149d13cc2bdb3355035258a9', 'lessThan': '928128865e43b197e30688dc1bc991592c97edcf', 'versionType': 'git'}, {'status': 'affected', 'version': '648700f76b03b7e8149d13cc2bdb3355035258a9', 'lessThan': '653d7ddf6cba867777a3d14c4f83ace008c5ad13', 'versionType': 'git'}, {'status': 'affected', 'version': '493107105843f299662b3b664a83804645564f12', 'versionType': 'git'}, {'status': 'affected', 'version': '4.4.174', 'lessThan': '4.5', 'versionType': 'semver'}], 'programFiles': ['net/ipv4/inet_fragment.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv4/inet_fragment.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: inet: frags: publish queues before arming timer inet_frag_create() arms the fragment queue timer before inserting the queue into the fqdir rhashtable. If the namespace fragment timeout is zero or negative, the timer can run before the queue is published. The timer callback then marks the queue complete, tries to remove a node that is not in the hash table yet, and drops the anticipated hash reference. Creation can subsequently publish the completed queue without restoring that reference, leaving a stale hash node after the caller drops the remaining reference. Publish the queue first and arm the timer while holding the queue lock. This makes timer expiry wait until the queue is visible in the hash table, so inet_frag_kill() can remove the node and balance the hash reference. Added Reference https://git.kernel.org/stable/c/653d7ddf6cba867777a3d14c4f83ace008c5ad13 Added Reference https://git.kernel.org/stable/c/928128865e43b197e30688dc1bc991592c97edcf Added Reference https://git.kernel.org/stable/c/9f904dd3e455750e5d4ec9b2f134835811b85a2f