CVE-2026-64027net: shaper: rework the VALID marking (again)
Updated under an hour ago ()
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It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
In the Linux kernel, the following vulnerability has been resolved: net: shaper: rework the VALID marking (again) Recent commit changed the semantics from NOT_VALID to VALID. I didn't realize that the flags are not stored atomically with the entry in XArray. There's still a race of reader observing a VALID mark for a slot, getting interrupted, writer replacing the entry with a different one, reader continuing, fetching the entry which is now a different pointer than the pointer for which VALID was meant. The biggest consequence of this is that we may see a UAF since net_shaper_rollback() assumed that entries without VALID can be freed without observing RCU. Looks like the XArray marks are buying us nothing at this point. Let's convert the code to an explicit valid field. The smp_load_acquire() / smp_store_release() barriers are marginally cleaner.
- 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) | 93954b40f6a4fc43226c01a15b02732f884500f1 builds before 2417df5e7bb4184b9d3a2988036bf2c46e594545; 93954b40f6a4fc43226c01a15b02732f884500f1 builds before 96ea960dd40fd55302e0fd755176f26a95e6a50c; from 93954b40f6a4fc43226c01a15b02732f884500f1 before b8d7519352ba8c6df83259295d4a3bad093cae90 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/2417df5e7bb4184b9d3a2988036bf2c46e594545patch
- https://git.kernel.org/stable/c/96ea960dd40fd55302e0fd755176f26a95e6a50cpatch
- https://git.kernel.org/stable/c/b8d7519352ba8c6df83259295d4a3bad093cae90patch
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.