CVE-2022-50476
ntb_netdev: Use dev_kfree_skb_any() in interrupt context
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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.
Timeline
ID reserved
By Linux
Published
- 13 months later
· 13 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 94% of all CVEs (8 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < d4460c82177899751975180c268f352893302221
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < 8b78493968ed3cef0326183ed059c55e42f24d5b
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < a6b9e09403102bdf8402dae734800e4916c7ea58
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < 13286ad1c7c49c606fdcba4cf66f953a1a16c1ca
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < 21296a52caa6a6bad6debdfe40ad81d4f1a27e69
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < 14d245da57a11e80277ab455aa9b6dcc5ed38a19
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < 07e28a8f450217db679802ebd4de0915556ce846
- affected 548c237c0a9972df5d1afaca38aa733ee577128d – < 5f7d78b2b12a9d561f48fa00bab29b40f4616dad
- affected 3.9
- unaffected < 3.9
- unaffected 4.9.337 – ≤ 4.9.*
- unaffected 4.14.303 – ≤ 4.14.*
- unaffected 4.19.270 – ≤ 4.19.*
- unaffected 5.4.229 – ≤ 5.4.*
- unaffected 5.10.163 – ≤ 5.10.*
- unaffected 5.15.86 – ≤ 5.15.*
- unaffected 6.0.16 – ≤ 6.0.*
- unaffected 6.1.2 – ≤ 6.1.*
- unaffected 6.2 – ≤ *
References (9)
- https://git.kernel.org/stable/c/d4460c82177899751975180c268f352893302221 (opens in a new tab)
- https://git.kernel.org/stable/c/dd860b39aa7c7b82e6c99b6fdb99d4610ce49d67 (opens in a new tab)
- https://git.kernel.org/stable/c/8b78493968ed3cef0326183ed059c55e42f24d5b (opens in a new tab)
- https://git.kernel.org/stable/c/a6b9e09403102bdf8402dae734800e4916c7ea58 (opens in a new tab)
- https://git.kernel.org/stable/c/13286ad1c7c49c606fdcba4cf66f953a1a16c1ca (opens in a new tab)
- https://git.kernel.org/stable/c/21296a52caa6a6bad6debdfe40ad81d4f1a27e69 (opens in a new tab)
- https://git.kernel.org/stable/c/14d245da57a11e80277ab455aa9b6dcc5ed38a19 (opens in a new tab)
- https://git.kernel.org/stable/c/07e28a8f450217db679802ebd4de0915556ce846 (opens in a new tab)
- https://git.kernel.org/stable/c/5f7d78b2b12a9d561f48fa00bab29b40f4616dad (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2022-50476)Record last updated .