- 9.1CriticalCVSS base score
- 0.56%Exploitation in 30 daysEPSS · top 53% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: tcp: prevent collapsing skbs across boundary in rtx queue tcp_write_collapse_fence() sets TCP_SKB_CB(skb)->eor = 1 on tcp_write_queue_tail(sk) to prevent skbs queued after a switch to device encryption from being collapsed into earlier skbs. The fence is a no-op if all earlier data has already been transmitted when the switch happens: sk->sk_write_queue is empty. The not yet acknowledged earlier skbs wait in sk->tcp_rtx_queue with eor 0. On a subsequent retransmit or SACK shift, tcp_retrans_try_collapse() or tcp_shift_skb_data() can then merge an skb queued after the switch into one queued before it. Both users of the fence are affected: - psp: devices only encrypt skbs with skb->decrypted set. The merged skb keeps decrypted = 0 from the earlier skb, so merged data sent after psp_sock_assoc_set_tx() is retransmitted in cleartext. - tls device offload: the merged skb straddles the start marker set in tls_set_device_offload(). The software fallback (fill_sg_in() returns -EINVAL) and the mlx5, nfp and funeth drivers cannot handle such an skb and drop it. Every retransmit rebuilds the same skb, so the connection stalls. Fix this in two places, for defense in depth: 1. Fall back to tcp_rtx_queue_tail(sk) in tcp_write_collapse_fence() when tcp_write_queue_tail(sk) is NULL. 2. Check !skb_cmp_decrypted(to, from) in tcp_skb_can_collapse(), as tcp_skb_can_collapse_rx() does on receive. skb_shift(), which both collapse paths call, already has a DEBUG_NET_WARN_ON_ONCE() for this condition.
Timeline
ID reserved
By Linux
- 23 days later
· 23 days later
Published
- 12 days later
· 12 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| NVDNVD · Received | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.56% · top 53% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Affected products
- affected e8f69799810c32dd40c6724d829eccc70baad07f – < bf785a303e5faad16439c563826a07cb811856c8
- affected e8f69799810c32dd40c6724d829eccc70baad07f – < 7061aafc680e14e22b191f178b768886475f8524
- affected e8f69799810c32dd40c6724d829eccc70baad07f – < 533344a00ad968181e60d0980c076a9d0de57482
- affected e8f69799810c32dd40c6724d829eccc70baad07f – < 9e2a2f98e8c0197108c6d97a1fa43bfd89071c30
- affected e8f69799810c32dd40c6724d829eccc70baad07f – < 1ae7aee395245874d797890380d9192bd858fb7e
- affected e8f69799810c32dd40c6724d829eccc70baad07f – < 7ba87509c54cd519e7ed362e0c85e8431f066a18
- affected e8f69799810c32dd40c6724d829eccc70baad07f – < 08e835f5ec6e261c79d8c39f8618b3af29e3b0da
- affected e8f69799810c32dd40c6724d829eccc70baad07f – < fc6d80eb504458d6416b75a94188b268c95c6533
- affected 4.18
- unaffected < 4.18
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.55 – ≤ 6.18.*
- unaffected 7.2.9 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/bf785a303e5faad16439c563826a07cb811856c8 (opens in a new tab)
- https://git.kernel.org/stable/c/7061aafc680e14e22b191f178b768886475f8524 (opens in a new tab)
- https://git.kernel.org/stable/c/533344a00ad968181e60d0980c076a9d0de57482 (opens in a new tab)
- https://git.kernel.org/stable/c/9e2a2f98e8c0197108c6d97a1fa43bfd89071c30 (opens in a new tab)
- https://git.kernel.org/stable/c/1ae7aee395245874d797890380d9192bd858fb7e (opens in a new tab)
- https://git.kernel.org/stable/c/7ba87509c54cd519e7ed362e0c85e8431f066a18 (opens in a new tab)
- https://git.kernel.org/stable/c/08e835f5ec6e261c79d8c39f8618b3af29e3b0da (opens in a new tab)
- https://git.kernel.org/stable/c/fc6d80eb504458d6416b75a94188b268c95c6533 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-103594 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-98549)Record last updated .