CVE-2026-31402 (GCVE-0-2026-31402)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:16 – Updated: 2026-06-30 03:19
VLAI
Title
nfsd: fix heap overflow in NFSv4.0 LOCK replay cache
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache The NFSv4.0 replay cache uses a fixed 112-byte inline buffer (rp_ibuf[NFSD4_REPLAY_ISIZE]) to store encoded operation responses. This size was calculated based on OPEN responses and does not account for LOCK denied responses, which include the conflicting lock owner as a variable-length field up to 1024 bytes (NFS4_OPAQUE_LIMIT). When a LOCK operation is denied due to a conflict with an existing lock that has a large owner, nfsd4_encode_operation() copies the full encoded response into the undersized replay buffer via read_bytes_from_xdr_buf() with no bounds check. This results in a slab-out-of-bounds write of up to 944 bytes past the end of the buffer, corrupting adjacent heap memory. This can be triggered remotely by an unauthenticated attacker with two cooperating NFSv4.0 clients: one sets a lock with a large owner string, then the other requests a conflicting lock to provoke the denial. We could fix this by increasing NFSD4_REPLAY_ISIZE to allow for a full opaque, but that would increase the size of every stateowner, when most lockowners are not that large. Instead, fix this by checking the encoded response length against NFSD4_REPLAY_ISIZE before copying into the replay buffer. If the response is too large, set rp_buflen to 0 to skip caching the replay payload. The status is still cached, and the client already received the correct response on the original request.
CWE
Assigner
References
URL Tags
https://git.kernel.org/stable/c/f9fcb4441f6c02bb2…
https://git.kernel.org/stable/c/2665887a69437a8a4…
https://git.kernel.org/stable/c/c9452c0797c95cf23…
https://git.kernel.org/stable/c/8afb437ea1f70cacb…
https://git.kernel.org/stable/c/dad0c3c0a8e5d1d6e…
https://git.kernel.org/stable/c/0f0e2a54a31a7f9ad…
https://git.kernel.org/stable/c/ae8498337dfdfda71…
https://git.kernel.org/stable/c/5133b61aaf437e5f2…
https://access.redhat.com/security/cve/CVE-2026-31402 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2454844 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:14823 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14925 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14869 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:15883 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13566 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19569 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13936 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13734 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:10108 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:11313 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13565 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19568 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13577 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14165 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13664 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13681 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13578 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14137 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14301 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f9fcb4441f6c02bb20c2eb340101e27dfe23607c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2665887a69437a8a4f552f69509eecfb73d4aa19 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c9452c0797c95cf2378170df96cf4f4b3bca7eff (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8afb437ea1f70cacb4bbdf11771fb5c4d720b965 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < dad0c3c0a8e5d1d6eb0fc455694ce3e25e6c57d0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0f0e2a54a31a7f9ad2915db99156114872317388 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ae8498337dfdfda71bdd0b807c9a23a126011d76 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5133b61aaf437e5f25b1b396b14242a6bb0508e2 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION)     cpe:/o:redhat:rhel_els:6
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Red Hat Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION)     cpe:/o:redhat:rhel_els:6
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Red Hat Red Hat Enterprise Linux Server (v. 7 ELS)     cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux for Real Time (v. 7 ELS)     cpe:/a:redhat:rhel_extras_rt_els:7
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Red Hat Red Hat Enterprise Linux Server Optional (v. 7 ELS)     cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux BaseOS (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux BaseOS (v. 8)     cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS AUS (v.8.4)     cpe:/o:redhat:rhel_aus:8.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)     cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS AUS (v.8.6)     cpe:/o:redhat:rhel_aus:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.8.6)     cpe:/o:redhat:rhel_e4s:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS TUS (v.8.6)     cpe:/o:redhat:rhel_tus:8.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.8.8)     cpe:/o:redhat:rhel_e4s:8.8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS TUS (v.8.8)     cpe:/o:redhat:rhel_tus:8.8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.0)     cpe:/o:redhat:rhel_e4s:9.0::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.2)     cpe:/o:redhat:rhel_e4s:9.2::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.4)     cpe:/o:redhat:rhel_eus:9.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.6)     cpe:/o:redhat:rhel_eus:9.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS (v. 9)     cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux CRB (v. 8)     cpe:/a:redhat:enterprise_linux:8::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux Real Time for NFV (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux NFV (v. 8)     cpe:/a:redhat:enterprise_linux:8::nfv
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Red Hat Red Hat Enterprise Linux NFV E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV (v. 9)     cpe:/a:redhat:enterprise_linux:9::nfv
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Red Hat Red Hat Enterprise Linux Real Time EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux Real Time (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux RT (v. 8)     cpe:/a:redhat:enterprise_linux:8::realtime
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Red Hat Red Hat Enterprise Linux Real Time E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::realtime
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Red Hat Red Hat Enterprise Linux Real Time E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::realtime
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Red Hat Red Hat Enterprise Linux Real Time EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::realtime
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Red Hat Red Hat Enterprise Linux Real Time EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::realtime
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Red Hat Red Hat Enterprise Linux Real Time (v. 9)     cpe:/a:redhat:enterprise_linux:9::realtime
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:/o:redhat:rhel_els:6"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_els:6"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_els:7"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux Server (v. 7 ELS)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_extras_rt_els:7"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux for Real Time (v. 7 ELS)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_els:7"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux Server Optional (v. 7 ELS)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux_eus:10.0"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.1",
              "cpe:/o:redhat:enterprise_linux:10.2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 10)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_e4s:9.0::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream E4S (v.9.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_e4s:9.2::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream E4S (v.9.2)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.4::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v.9.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.6::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v.9.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux:9::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 9)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux_eus:10.0"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS (v. 10.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.1",
              "cpe:/o:redhat:enterprise_linux:10.2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS (v. 10)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:8::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS (v. 8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_aus:8.4::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS AUS (v.8.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_aus:8.6::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS AUS (v.8.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:8.6::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.8.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_tus:8.6::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS TUS (v.8.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:8.8::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.8.8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_tus:8.8::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS TUS (v.8.8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:9.0::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.9.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:9.2::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.9.2)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_eus:9.4::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS (v.9.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_eus:9.6::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS (v.9.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:9::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS (v. 9)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux_eus:10.0"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.1",
              "cpe:/o:redhat:enterprise_linux:10.2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux:8::crb"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux CRB (v. 8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.4::crb"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat CodeReady Linux Builder EUS (v.9.4)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.6::crb"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat CodeReady Linux Builder EUS (v.9.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux:9::crb"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux_eus:10.0"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.1",
              "cpe:/o:redhat:enterprise_linux:10.2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux Real Time for NFV (v. 10)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux:8::nfv"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux NFV (v. 8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_e4s:9.0::nfv"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux NFV E4S (v.9.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_e4s:9.2::nfv"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.4::nfv"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)",
            "vendor": "Red Hat"
          },
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          "url": "https://git.kernel.org/stable/c/ae8498337dfdfda71bdd0b807c9a23a126011d76"
        },
        {
          "url": "https://git.kernel.org/stable/c/5133b61aaf437e5f25b1b396b14242a6bb0508e2"
        }
      ],
      "title": "nfsd: fix heap overflow in NFSv4.0 LOCK replay cache",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31402",
    "datePublished": "2026-04-03T15:16:05.724Z",
    "dateReserved": "2026-03-09T15:48:24.086Z",
    "dateUpdated": "2026-06-30T03:19:42.918Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31402",
      "date": "2026-06-29",
      "epss": "0.00644",
      "percentile": "0.46259"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31402\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-03T16:16:39.283\",\"lastModified\":\"2026-06-30T03:18:23.877\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: fix heap overflow in NFSv4.0 LOCK replay cache\\n\\nThe NFSv4.0 replay cache uses a fixed 112-byte inline buffer\\n(rp_ibuf[NFSD4_REPLAY_ISIZE]) to store encoded operation responses.\\nThis size was calculated based on OPEN responses and does not account\\nfor LOCK denied responses, which include the conflicting lock owner as\\na variable-length field up to 1024 bytes (NFS4_OPAQUE_LIMIT).\\n\\nWhen a LOCK operation is denied due to a conflict with an existing lock\\nthat has a large owner, nfsd4_encode_operation() copies the full encoded\\nresponse into the undersized replay buffer via read_bytes_from_xdr_buf()\\nwith no bounds check. This results in a slab-out-of-bounds write of up\\nto 944 bytes past the end of the buffer, corrupting adjacent heap memory.\\n\\nThis can be triggered remotely by an unauthenticated attacker with two\\ncooperating NFSv4.0 clients: one sets a lock with a large owner string,\\nthen the other requests a conflicting lock to provoke the denial.\\n\\nWe could fix this by increasing NFSD4_REPLAY_ISIZE to allow for a full\\nopaque, but that would increase the size of every stateowner, when most\\nlockowners are not that large.\\n\\nInstead, fix this by checking the encoded response length against\\nNFSD4_REPLAY_ISIZE before copying into the replay buffer. If the\\nresponse is too large, set rp_buflen to 0 to skip caching the replay\\npayload. The status is still cached, and the client already received the\\ncorrect response on the original 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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