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CVE-2026-89673

UnknownEPSS 0.20%

Last modified

CVE-2026-89673 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo nfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation as 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque() calls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes. The mismatch means the declared da_addr_body length exceeds the actual encoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply, leaking stale reply-page content to the client and mis-aligning the subsequent version list decode. Use xdr_align_size() for each string length to match what xdr_encode_opaque() actually writes.. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo nfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation as 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque() calls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes. The mismatch means the declared da_addr_body length exceeds the actual encoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply, leaking stale reply-page content to the client and mis-aligning the subsequent version list decode. Use xdr_align_size() for each string length to match what xdr_encode_opaque() actually writes.

Metrics

EPSS Probability
0.20%

9.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 3f1a2b0b2d575f39ff0bedb5411822fe7446a805, < 356decf074b82bac5564568203c12426dcea3470; >= 19a648a07572c70fbe16faf0fafaf3dce9fd998a, < 15460c8e6c9bc92cda8f68bc419ac082300ab3d6; >= 6d08bd22fa2941a4d5ef45ed115dd00e484a93d7, < 9be67a6be48ddf2ebaa98c0df671690b8f9666e7; >= 6372e2ee629894433fe6107d7048536a3280a284, < 88bce7e326c368d7df15126ccac537e54bebd467; >= 6372e2ee629894433fe6107d7048536a3280a284, < 74015b7be806ad9e21d46f7bd2831df280c6c783; >= 6372e2ee629894433fe6107d7048536a3280a284, < 41ebca28e17f84293650598f86bd69532ec1a8e0; >= 6372e2ee629894433fe6107d7048536a3280a284, < 62e5949f0dd5ec837af144860ff908369df4c7c9; >= 6372e2ee629894433fe6107d7048536a3280a284, < 8b989aaec85e1293a871d602590c951fe44b8647; 82e36f0c287769a0430268739a71dbd56df0e679; 6370e66a71c4869247f8f406c2a8b2c43df8998f; 16282aeca44bfac0d1ac3be6cd1a719d6ff3d749; efcae97fa425ca6db9d126e37daccf2d7225cb09; 64c959d59c24c661bd5338e4e6f1f703d7c309a1; >= 5.10.195, < 5.10.270; >= 5.15.132, < 5.15.221; >= 6.1.53, < 6.1.188; >= 4.14.326, < 4.15; >= 4.19.295, < 4.20; >= 5.4.257, < 5.5; >= 6.4.16, < 6.5; >= 6.5.3, < 6.6
LinuxLinux6.6

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89673?
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo nfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation as 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque() calls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes. The mismatch means the declared da_addr_body length exceeds the actual encoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply, leaking stale reply-page content to the client and mis-aligning the subsequent version list decode. Use xdr_align_size() for each string length to match what xdr_encode_opaque() actually writes.
How severe is CVE-2026-89673?
Severity scoring for CVE-2026-89673 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89673?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST