CVE-2021-47587 (GCVE-0-2021-47587)

Vulnerability from cvelistv5 – Published: 2024-06-19 14:53 – Updated: 2025-05-04 07:14
VLAI?
Title
net: systemport: Add global locking for descriptor lifecycle
Summary
In the Linux kernel, the following vulnerability has been resolved: net: systemport: Add global locking for descriptor lifecycle The descriptor list is a shared resource across all of the transmit queues, and the locking mechanism used today only protects concurrency across a given transmit queue between the transmit and reclaiming. This creates an opportunity for the SYSTEMPORT hardware to work on corrupted descriptors if we have multiple producers at once which is the case when using multiple transmit queues. This was particularly noticeable when using multiple flows/transmit queues and it showed up in interesting ways in that UDP packets would get a correct UDP header checksum being calculated over an incorrect packet length. Similarly TCP packets would get an equally correct checksum computed by the hardware over an incorrect packet length. The SYSTEMPORT hardware maintains an internal descriptor list that it re-arranges when the driver produces a new descriptor anytime it writes to the WRITE_PORT_{HI,LO} registers, there is however some delay in the hardware to re-organize its descriptors and it is possible that concurrent TX queues eventually break this internal allocation scheme to the point where the length/status part of the descriptor gets used for an incorrect data buffer. The fix is to impose a global serialization for all TX queues in the short section where we are writing to the WRITE_PORT_{HI,LO} registers which solves the corruption even with multiple concurrent TX queues being used.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 80105befdb4b8cea924711b40b2462b87df65b62 , < 8ed2f5d08d6e59f8c78b2869bfb95d0be32c094c (git)
Affected: 80105befdb4b8cea924711b40b2462b87df65b62 , < de57f62f76450b934de8203711bdc4f7953c3421 (git)
Affected: 80105befdb4b8cea924711b40b2462b87df65b62 , < f3fde37d3f0d429f0fcce214cb52588a9e21260e (git)
Affected: 80105befdb4b8cea924711b40b2462b87df65b62 , < 595a684fa6f23b21958379a18cfa83862c73c2e1 (git)
Affected: 80105befdb4b8cea924711b40b2462b87df65b62 , < c675256a7f131f5ba3f331efb715e8f31ea0e392 (git)
Affected: 80105befdb4b8cea924711b40b2462b87df65b62 , < 6e1011cd183faae8daff275c72444edcdfe0d473 (git)
Affected: 80105befdb4b8cea924711b40b2462b87df65b62 , < eb4687c7442942e115420a30185f8d83faf37696 (git)
Affected: 80105befdb4b8cea924711b40b2462b87df65b62 , < 8b8e6e782456f1ce02a7ae914bbd5b1053f0b034 (git)
Create a notification for this product.
    Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 4.4.296 , ≤ 4.4.* (semver)
Unaffected: 4.9.294 , ≤ 4.9.* (semver)
Unaffected: 4.14.259 , ≤ 4.14.* (semver)
Unaffected: 4.19.222 , ≤ 4.19.* (semver)
Unaffected: 5.4.168 , ≤ 5.4.* (semver)
Unaffected: 5.10.88 , ≤ 5.10.* (semver)
Unaffected: 5.15.11 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.