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Review reviewHigh

CVE-2026-53391

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr nfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a netaddr4 from a GETDEVICEINFO multipath-DS body, then immediately calls strrchr(buf, '.') to locate the port separator. Both decodes use xdr_stream_decode_string_dup(), and the current code checks only "nlen < 0" / "rlen < 0" before dereferencing the returned string. When the on-wire opaque has length zero, xdr_stream_decode_opaque_inline() returns 0 and xdr_stream_decode_string_dup() falls th...

CVSS
7.5
EPSS
0.52%
41.0% percentile
CISA KEV
Not listed
Published
2026.07.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.52%
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr nfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a netaddr4 from a GETDEVICEINFO multipath-DS body, then immediately calls strrchr(buf, '.') to locate the port separator. Both decodes use xdr_stream_decode_string_dup(), and the current code checks only "nlen < 0" / "rlen < 0" before dereferencing the returned string. When the on-wire opaque has length zero, xdr_stream_decode_opaque_inline() returns 0 and xdr_stream_decode_string_dup() falls th...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 6b7f3cf96364eaf597940cb5c68a682894829915 < 76b94cbd32aacf36a641956385a852635c6802b9, >= 6b7f3cf96364eaf597940cb5c68a682894829915 < c8e4e0c701d0192a2efb6df059c0f9e19678c23d, >= 6b7f3cf96364eaf597940cb5c68a682894829915 < 6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea, >= 6b7f3cf96364eaf597940cb5c68a682894829915 < 427ab81a811dab4bca9d19f82eec5847ae42646e, >= 6b7f3cf96364eaf597940cb5c68a682894829915 < 012d37a568bfbb2c9686f03ade75560bc7139956, >= 6b7f3cf96364eaf597940cb5c68a682894829915 < 30aae62e50b4e074a90a9a5e15246548fbdc1182, >= 6b7f3cf96364eaf597940cb5c68a682894829915 < 41fe0f7b84f0cb822ae10ab08592996a592b2a25, >= 4.0, >= 4.0 < 5.15.211, >= 5.16 < 6.1.177, >= 6.2 < 6.6.144, >= 6.7 < 6.12.95, >= 6.13 < 6.18.38, >= 6.19 < 7.1.3
Fixed versions
5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-476
CVE-2026-53391 — Linux Linux, linux kernel | SECUFOCUS NOW