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TI-2026-45477 Aliases CVE-2026-63912GHSA-6c6h-95cx-j99f

xfrm: esp: restore combined single-frag length gate

Priority MEDIUM 50CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 5 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00714 53rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.259, 5.15.210, 4.15 +9Red Hat: 1 advisoryRed Hat: 5 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux5.10.113 to before 5.10.259; 5.15.36 to before 5.15.210; 4.14.288 to before 4.15; 4.19.252 to before 4.20; 5.4.205 to before 5.5; 5.17.5 to before 5.185.10.259, 5.15.210, 4.15, 4.20, 5.5, 5.18Patch availableCNA
LinuxLinux5.18 and later5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1Patch availableCNA
  • Linux VendorLinux Affected 5.10.113 to before 5.10.259; 5.15.36 to before 5.15.210; 4.14.288 to before 4.15; 4.19.252 to before 4.20; 5.4.205 to before 5.5; 5.17.5 to before 5.18 Fixed in 5.10.259, 5.15.210, 4.15, 4.20, 5.5, 5.18 Patch available CNA
  • Linux VendorLinux Affected 5.18 and later Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1 Patch available CNA

CPE configurations NVD · 11

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.14.288 to before 4.15; 4.19.252 to before 4.20; 5.4.205 to before 5.5; 5.10.113 to before 5.10.259; 5.15.36 to before 5.15.210; 5.17.5 to before 5.18; 5.18.1 to before 6.1.176; 6.2 to before 6.6.143; 6.7 to before 6.12.93; 6.13 to before 6.18.35; 6.19 to before 7.0.12VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*5.18VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:*5.18 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc5:*:*:*:*:*:*5.18 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:*5.18 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:*5.18 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*7.1 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*7.1 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*7.1 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*7.1 rc4VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.14.288 to before 4.15; 4.19.252 to before 4.20; 5.4.205 to before 5.5; 5.10.113 to before 5.10.259; 5.15.36 to before 5.15.210; 5.17.5 to before 5.18; 5.18.1 to before 6.1.176; 6.2 to before 6.6.143; 6.7 to before 6.12.93; 6.13 to before 6.18.35; 6.19 to before 7.0.12 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:* Versions 5.18 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:* Versions 5.18 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc5:*:*:*:*:*:* Versions 5.18 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:* Versions 5.18 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:* Versions 5.18 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* Versions 7.1 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* Versions 7.1 rc4 Vulnerable ·Linux
Show 1 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*7.1 rc5VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* Versions 7.1 rc5 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.259, 5.15.210, 4.15, 4.20, 5.5, 5.18
  • Fix · CNA Linux (Linux) Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1

Red Hat 1 advisory

  • RHSA-2026:43307 Released 2026-07-22 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.29.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.29.1.el9_8, kernel-64k-devel-5.14.0-687.29.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.29.1.el9_8, kernel-64k-5.14.0-687.29.1.el9_8, kernel-64k-core-5.14.0-687.29.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.29.1.el9_8, libperf-5.14.0-687.29.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.29.1.el9_8, kernel-rt-64k-5.14.0-687.29.1.el9_8, kernel-rt-64k-core-5.14.0-687.29.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.29.1.el9_8, kernel-rt-core-5.14.0-687.29.1.el9_8, kernel-rt-debug-5.14.0-687.29.1.el9_8 +9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:43307
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:43307
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:43307
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:43307
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:43307
Not affected: 1 product
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-63912
  2. 2026-10-03 Alias added: GHSA-6c6h-95cx-j99f
  3. 2026-10-13 Affected versions changed · Red Hat
  4. 2026-10-16 CISA SSVC decision points changed
  5. 2026-10-19 Weakness changed · CISA ADP
  6. 2026-10-31 CVSS score changed · Red Hat

References

Patch 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences