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ReviewHigh

CVE-2026-80536

Linux

In the Linux kernel, the following vulnerability has been resolved: xfs: bounds-check buffer log item's dirty bitmap xlog_recover_do_reg_buffer() replays each dirty region described by a buffer log item's bitmap into the buffer read for that item: memcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT), item->ri_buf[i].iov_base, nbits << XFS_BLF_SHIFT); The destination offset (bit/nbits, from the logged dirty bitmap) and the buffer size (from the logged blf_len) are both attacker-controlled and otherwise unrelated, yet the only thing bounding the copy is an ASSERT(), which compiles away on pr...

CVSS
8.4
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.27
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.4

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: xfs: bounds-check buffer log item's dirty bitmap xlog_recover_do_reg_buffer() replays each dirty region described by a buffer log item's bitmap into the buffer read for that item: memcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT), item->ri_buf[i].iov_base, nbits << XFS_BLF_SHIFT); The destination offset (bit/nbits, from the logged dirty bitmap) and the buffer size (from the logged blf_len) are both attacker-controlled and otherwise unrelated, yet the only thing bounding the copy is an ASSERT(), which compiles away on pr...

Affected product and versions

Product
Linux
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < acb4e26295e7f0e685815a3fd3d70bd8329cefa1, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f3859c35a4fbc1c1c58431f684f808e43696891d, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f7b5fa83e2c192be922121b764415fa8c7549ea1, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b7528b42813f02724a78fce1da24d69d1bfc4d38, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7e32d4eebae6ca24f8a673c107fd7eca1f47afc2, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f8288214459ead7e87d26e5822f62c14a4f2ed6b, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < edaf5b6bd625356893da20d69a259b34a9de2694, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 813f8136a2ce1fee266d02a7df73db6e8a541604, >= 2.6.12
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available