9.8

CVE-2026-63912: linux Out-of-bounds Read

CVSS: 9.8v3.1CriticalAwaiting analysis
AliasesUBUNTU-CVE-2026-63912DEBIAN-CVE-2026-63912
Published 19-07-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-63912 is a critical (CVSS 9.8) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 52.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.71%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 153 · Related 152
OPENSUSE-SU-2026:21555-1RHSA-2026:43307SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1

Showing 100 of 153. Use Open JSON for the complete list.

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len. Reject the page-frag fast path when the combined aligned length exceeds a page. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len. Restore this combined-length page gate for both IPv4 and IPv6.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.71%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

0.00 pp

From 0.71% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.71%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu166 products
  • linuxAll versions (No fix recorded) | < 5.15.0-194.204 | < 6.8.0-142.142 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1116.123 | < 6.8.0-1065.68 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
Linux1 product
  • linux≥ c075c3ea031757f8ea2d34567565b61a868c08d5, < 566295735530ee513326049b0540f32ec050bf2e | ≥ a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea, < 5d7ab86e2b6bc23054616bf6ac562013bf60af8c | ≥ 5bd8baab087dff657e05387aee802e70304cc813, < 36519e3d941fc99d3b52c134dbaf311f987a4708 | ≥ 5bd8baab087dff657e05387aee802e70304cc813, < 322e48187e0245ab2fff6fec2220b0cae677dbec | ≥ 5bd8baab087dff657e05387aee802e70304cc813, < b84091ceddc9f133229dceab3ccc930bf27f9cba | ≥ 5bd8baab087dff657e05387aee802e70304cc813, < c093468aea8277f77272a4f199b2e15e19cabb59 | ≥ 5bd8baab087dff657e05387aee802e70304cc813, < 65f3b3fc2347b89fe21db1e92c7681368415f095 | ≥ 5bd8baab087dff657e05387aee802e70304cc813, < dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40 | 2c66b0c95bb0aa7652ba1eba293d0d5993b35a38 | ef6f83df1209a7d9bd1c605a62457d4c00f9179e | 3defefd22ad5fbbe639b6157fb7e6311b2bf333d | b657030870bb5351c5b1e84d4e9f186da6ca0496 | ≥ 5.10.113, < 5.10.259 | ≥ 5.15.36, < 5.15.210 | ≥ 4.14.288, < 4.15 | ≥ 4.19.252, < 4.20 | ≥ 5.4.205, < 5.5 | ≥ 5.17.5, < 5.18 | 5.18

3 vendors · 168 products

References

36 links
Show all 36 references