CVE-2026-43319spi: spidev: fix lock inversion between spi_lock and buf_lock
- 5.5MediumCVSS base score
- 0.09%Exploitation in 30 daysEPSS · top 99% 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: spidev: fix lock inversion between spi_lock and buf_lock The spidev driver previously used two mutexes, spi_lock and buf_lock, but acquired them in different orders depending on the code path: write()/read(): buf_lock -> spi_lock ioctl(): spi_lock -> buf_lock This AB-BA locking pattern triggers lockdep warnings and can cause real deadlocks: WARNING: possible circular locking dependency detected spidev_ioctl() -> mutex_lock(&spidev->buf_lock) spidev_sync_write() -> mutex_lock(&spidev->spi_lock) *** DEADLOCK *** The issue is reproducible with a simple userspace program that performs write() and SPI_IOC_WR_MAX_SPEED_HZ ioctl() calls from separate threads on the same spidev file descriptor. Fix this by simplifying the locking model and removing the lock inversion entirely. spidev_sync() no longer performs any locking, and all callers serialize access using spi_lock. buf_lock is removed since its functionality is fully covered by spi_lock, eliminating the possibility of lock ordering issues. This removes the lock inversion and prevents deadlocks without changing userspace ABI or behaviour.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 6 months later
· 6 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 · Modified | 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)
- 0.09% · top 99% of all CVEs (14 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 a720416d94634068951773cb9e9d6f1b73769e5b – < fabfed1afe273717ea33b8aee46b767360edbb80
- affected a720416d94634068951773cb9e9d6f1b73769e5b – < f8431b8672231d378b03176fe74c95adfd3522cf
- affected a720416d94634068951773cb9e9d6f1b73769e5b – < e341e18215030af2136836b78508e0d798916df7
- affected a720416d94634068951773cb9e9d6f1b73769e5b – < 41ccfac7d302968a4f32b5f7b012d066c5f5cdf8
- affected a720416d94634068951773cb9e9d6f1b73769e5b – < 40534d19ed2afb880ecf202dab26a8e7a5808d16
- affected 6.2
- unaffected < 6.2
- unaffected 6.6.142 – ≤ 6.6.*
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.16 – ≤ 6.18.*
- unaffected 6.19.6 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References5
- https://git.kernel.org/stable/c/fabfed1afe273717ea33b8aee46b767360edbb80 (opens in a new tab)
- https://git.kernel.org/stable/c/f8431b8672231d378b03176fe74c95adfd3522cf (opens in a new tab)
- https://git.kernel.org/stable/c/e341e18215030af2136836b78508e0d798916df7 (opens in a new tab)
- https://git.kernel.org/stable/c/41ccfac7d302968a4f32b5f7b012d066c5f5cdf8 (opens in a new tab)
- https://git.kernel.org/stable/c/40534d19ed2afb880ecf202dab26a8e7a5808d16 (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-2026-28603 (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-2026-43319)Record last updated .