CVE-2021-4441spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op()
- 5.5MediumCVSS base score
- 0.22%Exploitation in 30 daysEPSS · top 87% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op() In zynq_qspi_exec_mem_op(), kzalloc() is directly used in memset(), which could lead to a NULL pointer dereference on failure of kzalloc(). Fix this bug by adding a check of tmpbuf. This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs. Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug. Builds with CONFIG_SPI_ZYNQ_QSPI=m show no new warnings, and our static analyzer no longer warns about this code.
Timeline
ID reserved
By Linux
Published
- 21 months later
· 21 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)
- 0.22% · top 87% of all CVEs (13 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.
Affected products
- affected 67dca5e580f1e93a66177389981541cac208c817 – < df14d2bed8e2455878e046e67123d9ecb2e79056
- affected 67dca5e580f1e93a66177389981541cac208c817 – < 2efece1368aeee2d2552c7ec36aeb676c4d4c95f
- affected 67dca5e580f1e93a66177389981541cac208c817 – < 3c32405d6474a21f7d742828e73c13e326dcae82
- affected 67dca5e580f1e93a66177389981541cac208c817 – < b9dd08cbebe0c593c49bf86d2012a431494e54cb
- affected 67dca5e580f1e93a66177389981541cac208c817 – < ab3824427b848da10e9fe2727f035bbeecae6ff4
- affected 5.2
- unaffected < 5.2
- unaffected 5.4.182 – ≤ 5.4.*
- unaffected 5.10.103 – ≤ 5.10.*
- unaffected 5.15.26 – ≤ 5.15.*
- unaffected 5.16.12 – ≤ 5.16.*
- unaffected 5.17 – ≤ *
References
References5
- https://git.kernel.org/stable/c/df14d2bed8e2455878e046e67123d9ecb2e79056 (opens in a new tab)
- https://git.kernel.org/stable/c/2efece1368aeee2d2552c7ec36aeb676c4d4c95f (opens in a new tab)
- https://git.kernel.org/stable/c/3c32405d6474a21f7d742828e73c13e326dcae82 (opens in a new tab)
- https://git.kernel.org/stable/c/b9dd08cbebe0c593c49bf86d2012a431494e54cb (opens in a new tab)
- https://git.kernel.org/stable/c/ab3824427b848da10e9fe2727f035bbeecae6ff4 (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)
- EUVD EUVD-2021-34640 (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-2021-4441)Record last updated .