CVE-2026-52971net: ena: PHC: Fix potential use-after-free in get_timestamp
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: net: ena: PHC: Fix potential use-after-free in get_timestamp Move the phc->active check and resp pointer assignment to after acquiring the spinlock. Previously, phc->active was checked without holding the lock, and resp was cached from ena_dev->phc.virt_addr before the lock was acquired. If ena_com_phc_destroy() runs between the lockless active check and the lock acquisition, it sets active=false, releases the lock, frees the DMA memory, and sets virt_addr=NULL. The get_timestamp path would then read a NULL virt_addr and dereference it. With both the active check and the pointer read under the lock, destroy cannot free the memory while get_timestamp is using it.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e0ea34158ee8c4f7536cd781010339ff28c0d24c before 95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98; from e0ea34158ee8c4f7536cd781010339ff28c0d24c before ca9ed40f28949353911dcb524ff8fff2f3409c97; from e0ea34158ee8c4f7536cd781010339ff28c0d24c before e42c755582f0960e684298762f0ab927b3778376 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.17 before 6.18.33; from 6.19 before 7.0.10; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98patch
- https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97patch
- https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.