CVE detail
CVE-2026-53393
In the Linux kernel, the following vulnerability has been resolved: nfsd: reset write verifier on deferred writeback errors nfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to detect deferred writeback errors, but neither rotates the server's write verifier (nn->writeverf) when this check fails. Every other durable-storage-failure path in these functions calls commit_reset_write_verifier() before returning an error. The missing rotation means clients holding UNSTABLE write data under the current verifier will COMMIT, receive the unchanged verifier back, and conclude their data is durable — silently dropping data that failed writeback. This violates the UNSTABLE+COMMIT durability contract (RFC 1813 §3.3.7, RFC 8881 §18.32). Add commit_reset_write_verifier() calls at both filemap_check_wb_err() error sites, matching the pattern used by adjacent error paths in the same functions. The helper already filters -EAGAIN and -ESTALE internally, so the calls are unconditionally safe.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 23.0 · diversity 10.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 9
- within the 30d window
- Peak daily
- 8
- highest bucket
Evidence
Source links by recency
9 source links · newest first
Information published.
vendormsrc.microsoft.comJul 20, 2026, 8:04 AMNo excerpt available.
Exploitgit.kernel.orgJul 19, 2026, 12:16 PMNo excerpt available.
Exploitgit.kernel.orgJul 19, 2026, 12:16 PMNo excerpt available.
Exploitgit.kernel.orgJul 19, 2026, 12:16 PMNo excerpt available.
Exploitgit.kernel.orgJul 19, 2026, 12:16 PMNo excerpt available.
Exploitgit.kernel.orgJul 19, 2026, 12:16 PMNo excerpt available.
Exploitgit.kernel.orgJul 19, 2026, 12:16 PMNo excerpt available.
Exploitgit.kernel.orgJul 19, 2026, 12:16 PMNo excerpt available.
Exploitgit.kernel.orgJul 19, 2026, 12:16 PM
Exploit code
Public exploit repository references
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0 repository references · best confidence N/A · max 0 stars
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