Application-buffer corruption via stale TLS receive iterator
Published Aug 22, 2026 · Updated Aug 25, 2026
Out-of-bounds write in the Linux kernel TLS receive path allows remote attackers to corrupt application buffers via crafted TLS 1.3 records. tls_decrypt_sg() advances msg_iter during optimistic zero-copy mapping, and tls_decrypt_sw() retries through an skb without restoring the iterator. The receiver must use TLS 1.3 kTLS RX with TLS_RX_EXPECT_NO_PAD; the later copy overwrites subsequent iovecs beyond recvmsg()'s returned length.
Summary
What happened
Out-of-bounds write in the Linux kernel TLS receive path allows remote attackers to corrupt application buffers via crafted TLS 1.3 records. tls_decrypt_sg() advances msg_iter during optimistic zero-copy mapping, and tls_decrypt_sw() retries through an skb without restoring the iterator. The receiver must use TLS 1.3 kTLS RX with TLS_RX_EXPECT_NO_PAD; the later copy overwrites subsequent iovecs beyond recvmsg()'s returned length.
The record
- CVE
- CVE-2026-74611
- Published
- Aug 22, 2026
- Updated
- Aug 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-787, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 22, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.0
- Affected versionversion=ce61327ce989b63c0bd1cc7afee00e218ee696ac <1c8629651cb54f7b51db8fc0b1a9944e4a4b0f5e
- Affected versionversion=ce61327ce989b63c0bd1cc7afee00e218ee696ac <3c837266a734e2a22b24d2d567404a501d405835
- Affected versionversion=ce61327ce989b63c0bd1cc7afee00e218ee696ac <68787940274ec89f41dc91b1a68ee1a16a90735f
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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Your stack
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