CVE-2024-35977platform/chrome: cros_ec_uart: properly fix race condition
- 4.7MediumCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 93% 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: platform/chrome: cros_ec_uart: properly fix race condition The cros_ec_uart_probe() function calls devm_serdev_device_open() before it calls serdev_device_set_client_ops(). This can trigger a NULL pointer dereference: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... Call Trace: <TASK> ... ? ttyport_receive_buf A simplified version of crashing code is as follows: static inline size_t serdev_controller_receive_buf(struct serdev_controller *ctrl, const u8 *data, size_t count) { struct serdev_device *serdev = ctrl->serdev; if (!serdev || !serdev->ops->receive_buf) // CRASH! return 0; return serdev->ops->receive_buf(serdev, data, count); } It assumes that if SERPORT_ACTIVE is set and serdev exists, serdev->ops will also exist. This conflicts with the existing cros_ec_uart_probe() logic, as it first calls devm_serdev_device_open() (which sets SERPORT_ACTIVE), and only later sets serdev->ops via serdev_device_set_client_ops(). Commit 01f95d42b8f4 ("platform/chrome: cros_ec_uart: fix race condition") attempted to fix a similar race condition, but while doing so, made the window of error for this race condition to happen much wider. Attempt to fix the race condition again, making sure we fully setup before calling devm_serdev_device_open().
Timeline
ID reserved
By Linux
- 3 days later
· 3 days later
Published
- 24 months later
· 24 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 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 93% 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 4.7.
Affected products
- affected 01f95d42b8f4e88f20d68791b0a85dbb9e3d1ac9 – < cfd758041d8b79aa8c3f811b6bd6105379f2f702
- affected 01f95d42b8f4e88f20d68791b0a85dbb9e3d1ac9 – < 9e9bb74a93b7daa32313ccaefd0edc529d40daf8
- affected 01f95d42b8f4e88f20d68791b0a85dbb9e3d1ac9 – < 5e700b384ec13f5bcac9855cb28fcc674f1d3593
- affected 6.3
- unaffected < 6.3
- unaffected 6.6.28 – ≤ 6.6.*
- unaffected 6.8.7 – ≤ 6.8.*
- unaffected 6.9 – ≤ *
References
References3
- https://git.kernel.org/stable/c/cfd758041d8b79aa8c3f811b6bd6105379f2f702 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/9e9bb74a93b7daa32313ccaefd0edc529d40daf8 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/5e700b384ec13f5bcac9855cb28fcc674f1d3593 (opens in a new tab)x_transferred
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-2024-35695 (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-2024-35977)Record last updated .