CVE-2025-68291

UNRATEDCVSS · not yet scored

Also known asEUVD-2025-203789 (ENISA EUVD) · GHSA-92x9-c26m-74g2 (GitHub Security Advisories)Source: ENISA EUVD

—
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

mptcp: Initialise rcv_mss before calling tcp_send_active_reset() in mptcp_do_fastclose().

syzbot reported divide-by-zero in __tcp_select_window() by MPTCP socket. [0]

We had a similar issue for the bare TCP and fixed in commit 499350a5a6e7 ("tcp: initialize rcv_mss to TCP_MIN_MSS instead of 0").

Let's apply the same fix to mptcp_do_fastclose().

[0]: Oops: divide error: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 6068 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__tcp_select_window+0x824/0x1320 net/ipv4/tcp_output.c:3336 Code: ff ff ff 44 89 f1 d3 e0 89 c1 f7 d1 41 01 cc 41 21 c4 e9 a9 00 00 00 e8 ca 49 01 f8 e9 9c 00 00 00 e8 c0 49 01 f8 44 89 e0 99 7c 24 1c 41 29 d4 48 bb 00 00 00 00 00 fc ff df e9 80 00 00 00 RSP: 0018:ffffc90003017640 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88807b469e40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003017730 R08: ffff888033268143 R09: 1ffff1100664d028 R10: dffffc0000000000 R11: ffffed100664d029 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 000055557faa0500(0000) GS:ffff888126135000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f64a1912ff8 CR3: 0000000072122000 CR4: 00000000003526f0 Call Trace: tcp_select_window net/ipv4/tcp_output.c:281 [inline] __tcp_transmit_skb+0xbc7/0x3aa0 net/ipv4/tcp_output.c:1568 tcp_transmit_skb net/ipv4/tcp_output.c:1649 [inline] tcp_send_active_reset+0x2d1/0x5b0 net/ipv4/tcp_output.c:3836 mptcp_do_fastclose+0x27e/0x380 net/mptcp/protocol.c:2793 mptcp_disconnect+0x238/0x710 net/mptcp/protocol.c:3253 mptcp_sendmsg_fastopen+0x2f8/0x580 net/mptcp/protocol.c:1776 mptcp_sendmsg+0x1774/0x1980 net/mptcp/protocol.c:1855 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xe5/0x270 net/socket.c:742 __sys_sendto+0x3bd/0x520 net/socket.c:2244 __do_sys_sendto net/socket.c:2251 [inline] __se_sys_sendto net/socket.c:2247 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2247 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f66e998f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffff9acedb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f66e9be5fa0 RCX: 00007f66e998f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ffff9acee10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f66e9be5fa0 R14: 00007f66e9be5fa0 R15: 0000000000000006

CVSS v3
—
EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
—
EG Risk
—
EPSS PROB
0.2%
EPSS %ILE
12th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the BOD 26-04 block below.

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 16, 2025

Last Modified

October 15, 2026

References (7)

Vendor Advisories for CVE-2025-68291(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(14)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-virtual-6.8 (6.8.0-110.110) @ noble2026-10-15ubuntu
ubuntulinux-tools-realtime-6.8.1 (6.8.1-1047.48) @ noble2026-10-15ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1054.57+fips1) @ noble2026-10-15ubuntu
ubuntulinux-tools-nvidia-64k-6.8 (6.8.0-1051.54) @ noble2026-10-15ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1049.50) @ noble2026-10-15ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2042.43) @ noble2026-10-15ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1051.54.1) @ noble2026-10-15ubuntu
ubuntulinux-tools-gcp-edge (6.8.0-1054.57~22.04.1) @ jammy2026-10-15ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1054.60) @ noble2026-10-15ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1054.60+fips1) @ noble2026-10-15ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1022.22) @ noble2026-10-15ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1059.65~22.04.1) @ jammy2026-10-15ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1052.56) @ noble2026-10-15ubuntu
linuxKernel @ 6.1.160 (fixes >=6.1.159)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.159-1~deb11u1 (14 versions)
  • every version up to 6.1.162-1~deb11u1: fixed in 6.1.162-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (46 versions)
  • every version up to 6.1.162-1: fixed in 6.1.162-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.17.9-1 (82 versions)
  • every version up to 6.17.11-1: fixed in 6.17.11-1
—

Additional Vendor Advisories

(13)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 45× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 239 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 140 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  4. 2026-11-03 16:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  6. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  7. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  8. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  10. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  11. 2026-10-27 17:25 UTCOSV refresh
  12. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  13. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  14. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  15. 2026-10-25 16:05 UTCEG score recompute
  16. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  18. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  21. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  22. 2026-10-18 05:17 UTCEG score recompute
  23. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-10-16 16:39 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
Show 74 more
  1. 2026-10-15 02:57 UTCGHSA enrichmentGHSA-92x9-c26m-74g2
  2. 2026-10-15 02:25 UTCNVD update
  3. 2026-10-15 02:14 UTCVendor advisory
  4. 2026-10-15 02:13 UTCGHSA enrichmentGHSA-92x9-c26m-74g2
  5. 2026-10-15 01:30 UTCMITRE cvelistV5
  6. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  7. 2026-10-13 20:07 UTCVendor advisory
  8. 2026-10-13 20:07 UTCGHSA enrichmentGHSA-92x9-c26m-74g2
  9. 2026-10-13 19:24 UTCNVD update
  10. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  11. 2026-10-12 16:47 UTCEG score recompute
  12. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  13. 2026-10-11 20:22 UTCEG score recompute
  14. 2026-10-11 18:34 UTCEG score recompute
  15. 2026-10-11 15:08 UTCEG score recompute
  16. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  18. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  21. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  23. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  24. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  25. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  26. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  27. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  28. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  29. 2026-09-28 01:32 UTCOSV refresh
  30. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  31. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  32. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  33. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  34. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  35. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  36. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  37. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  38. 2026-09-15 03:10 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  39. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  40. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  41. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  42. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  43. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  44. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  45. 2026-09-08 09:31 UTCGHSA enrichmentGHSA-92x9-c26m-74g2
  46. 2026-09-08 08:53 UTCMITRE cvelistV5
  47. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  48. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  49. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  50. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  51. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  52. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  53. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  54. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  55. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  56. 2026-08-26 09:13 UTCOSV refresh
  57. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  58. 2026-08-24 14:16 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  59. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  60. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  61. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  62. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  63. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  64. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  65. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  66. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  67. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  68. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  69. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  70. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  71. 2026-08-09 23:35 UTCVendor advisory
  72. 2026-08-09 23:35 UTCGHSA enrichmentGHSA-92x9-c26m-74g2
  73. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  74. 2026-08-08 16:36 UTCEPSS rescoreEPSS 0.2% · 8th percentile

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2025-68291?
CVE-2025-68291 is a vulnerability whose severity is not yet rated; its CVE record was published on December 16, 2025. In the Linux kernel, the following vulnerability has been resolved: mptcp: Initialise rcv_mss before calling tcp_send_active_reset() in mptcp_do_fastclose(). syzbot reported divide-by-zero in __tcp_select_window() by MPTCP socket. [0] We had a similar issue for the bare TCP and fixed in commit…
When was the CVE record for CVE-2025-68291 published?
The CVE record for CVE-2025-68291 was published on December 16, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 15, 2026; the record at its source may have been updated since.
Is CVE-2025-68291 actively exploited?
CVE-2025-68291 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
How do I remediate CVE-2025-68291?
A fix for CVE-2025-68291 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-68291 are linked in the Vendor Advisories panel on this page.

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