CVE-2022-50476 (GCVE-0-2022-50476)

Vulnerability from cvelistv5 – Published: 2025-10-04 15:16 – Updated: 2025-10-04 15:16
VLAI?
Title
ntb_netdev: Use dev_kfree_skb_any() in interrupt context
Summary
In the Linux kernel, the following vulnerability has been resolved: ntb_netdev: Use dev_kfree_skb_any() in interrupt context TX/RX callback handlers (ntb_netdev_tx_handler(), ntb_netdev_rx_handler()) can be called in interrupt context via the DMA framework when the respective DMA operations have completed. As such, any calls by these routines to free skb's, should use the interrupt context safe dev_kfree_skb_any() function. Previously, these callback handlers would call the interrupt unsafe version of dev_kfree_skb(). This has not presented an issue on Intel IOAT DMA engines as that driver utilizes tasklets rather than a hard interrupt handler, like the AMD PTDMA DMA driver. On AMD systems, a kernel WARNING message is encountered, which is being issued from skb_release_head_state() due to in_hardirq() being true. Besides the user visible WARNING from the kernel, the other symptom of this bug was that TCP/IP performance across the ntb_netdev interface was very poor, i.e. approximately an order of magnitude below what was expected. With the repair to use dev_kfree_skb_any(), kernel WARNINGs from skb_release_head_state() ceased and TCP/IP performance, as measured by iperf, was on par with expected results, approximately 20 Gb/s on AMD Milan based server. Note that this performance is comparable with Intel based servers.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < d4460c82177899751975180c268f352893302221 (git)
Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67 (git)
Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 8b78493968ed3cef0326183ed059c55e42f24d5b (git)
Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < a6b9e09403102bdf8402dae734800e4916c7ea58 (git)
Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 13286ad1c7c49c606fdcba4cf66f953a1a16c1ca (git)
Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 21296a52caa6a6bad6debdfe40ad81d4f1a27e69 (git)
Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 14d245da57a11e80277ab455aa9b6dcc5ed38a19 (git)
Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 07e28a8f450217db679802ebd4de0915556ce846 (git)
Affected: 548c237c0a9972df5d1afaca38aa733ee577128d , < 5f7d78b2b12a9d561f48fa00bab29b40f4616dad (git)
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    Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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This has\\nnot presented an issue on Intel IOAT DMA engines as\\nthat driver utilizes tasklets rather than a hard\\ninterrupt handler, like the AMD PTDMA DMA driver.\\nOn AMD systems, a kernel WARNING message is\\nencountered, which is being issued from\\nskb_release_head_state() due to in_hardirq()\\nbeing true.\\n\\nBesides the user visible WARNING from the kernel,\\nthe other symptom of this bug was that TCP/IP performance\\nacross the ntb_netdev interface was very poor, i.e.\\napproximately an order of magnitude below what was\\nexpected. With the repair to use dev_kfree_skb_any(),\\nkernel WARNINGs from skb_release_head_state() ceased\\nand TCP/IP performance, as measured by iperf, was on\\npar with expected results, approximately 20 Gb/s on\\nAMD Milan based server. 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  }
}


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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.