Allocation of Resources Without Limits or Throttling The advisory has been revoked - it doesn't affect any version of package kernel-debug-devel-matched (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-KERNELDEBUGDEVELMATCHED-14104918
- published25 Nov 2025
- disclosed21 Nov 2025
Introduced: 21 Nov 2025
CVE-2025-40210 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-devel-matched package and not the kernel-debug-devel-matched package as distributed by RHEL.
In the Linux kernel, the following vulnerability has been resolved:
Revert "NFSD: Remove the cap on number of operations per NFSv4 COMPOUND"
I've found that pynfs COMP6 now leaves the connection or lease in a strange state, which causes CLOSE9 to hang indefinitely. I've dug into it a little, but I haven't been able to root-cause it yet. However, I bisected to commit 48aab1606fa8 ("NFSD: Remove the cap on number of operations per NFSv4 COMPOUND").
Tianshuo Han also reports a potential vulnerability when decoding an NFSv4 COMPOUND. An attacker can place an arbitrarily large op count in the COMPOUND header, which results in:
[ 51.410584] nfsd: vmalloc error: size 1209533382144, exceeds total pages, mode:0xdc0(GFP_KERNEL|__GFP_ZERO), nodemask=(null),cpuset=/,mems_allowed=0
when NFSD attempts to allocate the COMPOUND op array.
Let's restore the operation-per-COMPOUND limit, but increased to 200 for now.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2416307
- https://access.redhat.com/security/cve/CVE-2025-40210
- https://access.redhat.com/errata/RHSA-2026:18134
- https://git.kernel.org/stable/c/3e7f011c255582d7c914133785bbba1990441713
- https://git.kernel.org/stable/c/b3ee7ce432289deac87b9d14e01f2fe6958f7f0b