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Review reviewHigh

CVE-2026-46130

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: dm-verity-fec: fix reading parity bytes split across blocks (take 3) fec_decode_bufs() assumes that the parity bytes of the first RS codeword it decodes are never split across parity blocks. This assumption is false. Consider v->fec->block_size == 4096 && v->fec->roots == 17 && fio->nbufs == 1, for example. In that case, each call to fec_decode_bufs() consumes v->fec->roots * (fio->nbufs << DM_VERITY_FEC_BUF_RS_BITS) = 272 parity bytes. Considering that the parity data for each message block starts on a block boundary, the...

CVSS
7.1
EPSS
0.12%
2.51% percentile
CISA KEV
Not listed
Published
2026.05.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.12%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: dm-verity-fec: fix reading parity bytes split across blocks (take 3) fec_decode_bufs() assumes that the parity bytes of the first RS codeword it decodes are never split across parity blocks. This assumption is false. Consider v->fec->block_size == 4096 && v->fec->roots == 17 && fio->nbufs == 1, for example. In that case, each call to fec_decode_bufs() consumes v->fec->roots * (fio->nbufs << DM_VERITY_FEC_BUF_RS_BITS) = 272 parity bytes. Considering that the parity data for each message block starts on a block boundary, the...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 6df90c02bae468a3a6110bafbc659884d0c4966c < d47281b9a4472cfd73122393e79fbe76b651e46a, >= 6df90c02bae468a3a6110bafbc659884d0c4966c < 3d1b4e2d8ac0a1a1390a117f61ce0ca1c47e3bcb, >= 6df90c02bae468a3a6110bafbc659884d0c4966c < 430a05cb926f6bdf53e81460a2c3a553257f3f61, >= 6bc6ee31113b05db605694491bdeb2b1730142f1, >= 12caa73a28f0ae147ec0356b45091edf2462462b, >= fc8943886629e26de34867db302c74d465510826, >= 6.1.125 < 6.2, >= 6.6.72 < 6.7, >= 6.12.10 < 6.13, >= 6.13, >= 6.13.1 < 7.0.7, 6.13
Fixed versions
6.2, 6.7, 6.13, 7.0.7

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:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125
CVE-2026-46130 — Linux Linux, linux kernel | SECUFOCUS NOW