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TI-2026-38448 Aliases CVE-2026-53362GHSA-3x6f-vm7x-cgm7

ipv6: account for fraggap on the paged allocation path

Priority CRITICAL 93Exploited in the wildCWE-122Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branch is taken (MSG_MORE / NETIF_F_SG / large fraglen), alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap (datalen = length + fraggap). When fraggap is non-zero, this is not the first skb and transhdrlen is zero. The fraggap bytes carried over from the previous skb are copied just past the fragment headers in the new skb's linear area. The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount, and the copy writes past skb->end into the trailing skb_shared_info. An unprivileged user can trigger this via a UDPv6 socket using MSG_MORE together with MSG_SPLICE_PAGES. The bad accounting was introduced by commit 773ba4fe9104 ("ipv6: avoid partial copy for zc"). Before commit ce650a166335 ("udp6: Fix __ip6_append_data()'s handling of MSG_SPLICE_PAGES"), the negative copy value caused -EINVAL to be returned. That later commit allowed MSG_SPLICE_PAGES to proceed in this case, making the corruption triggerable. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic. Since a negative copy is no longer expected for a valid MSG_SPLICE_PAGES case, remove the MSG_SPLICE_PAGES exception from the negative copy check.

Why it matters now

Exploitation Active In CISA KEV since 2026-08-27CISA due date 2026-08-30
EPSS 0.00709 53rd percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.1.177, 6.6.144, 6.12.95 +3Red Hat: 4 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
No
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
LinuxLinux6.0 and later6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2Patch availableCNA
  • Linux VendorLinux Affected 6.0 and later Fixed in 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.0 to before 6.1.177; 6.2 to before 6.6.144; 6.7 to before 6.12.95; 6.13 to before 6.18.38; 6.19 to before 7.1.3VulnerableLinux
cpe:2.3:o:siemens:simatic_s7-1500_tm_mfp_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableSiemens
cpe:2.3:h:siemens:simatic_s7-1500_tm_mfp:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.0 to before 6.1.177; 6.2 to before 6.6.144; 6.7 to before 6.12.95; 6.13 to before 6.18.38; 6.19 to before 7.1.3 Vulnerable ·Linux
  • cpe:2.3:o:siemens:simatic_s7-1500_tm_mfp_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_s7-1500_tm_mfp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2

Red Hat 4 advisories

  • RHSA-2026:43826 Released 2026-07-22 · Red Hat rating Important
    kpatch-patch-6_12_0-211_16_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 10) kpatch-patch-6_12_0-211_16_1-1-4.el10_2
  • RHSA-2026:35840 Released 2026-07-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.86.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.86.1.el10_0, kernel-64k-devel-6.12.0-55.86.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.86.1.el10_0, kernel-64k-6.12.0-55.86.1.el10_0, kernel-64k-core-6.12.0-55.86.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.86.1.el10_0, libperf-6.12.0-55.86.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.86.1.el10_0, kernel-rt-64k-6.12.0-55.86.1.el10_0, kernel-rt-64k-core-6.12.0-55.86.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.86.1.el10_0, kernel-rt-core-6.12.0-55.86.1.el10_0, kernel-rt-debug-6.12.0-55.86.1.el10_0 +11
  • RHSA-2026:34911 Released 2026-07-02 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.30.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.30.1.el10_2, kernel-64k-devel-6.12.0-211.30.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.30.1.el10_2, kernel-64k-6.12.0-211.30.1.el10_2, kernel-64k-core-6.12.0-211.30.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.30.1.el10_2, libperf-6.12.0-211.30.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.30.1.el10_2, kernel-rt-64k-6.12.0-211.30.1.el10_2, kernel-rt-64k-core-6.12.0-211.30.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.30.1.el10_2, kernel-rt-core-6.12.0-211.30.1.el10_2, kernel-rt-debug-6.12.0-211.30.1.el10_2 +9
Show 1 more Red Hat advisories
  • RHSA-2026:34927 Released 2026-07-02 · Red Hat rating Important
    kernel security update
    • NVIDIA for RHEL 10 kernel-6.12.0-231.14.el10nv, kernel-64k-6.12.0-231.14.el10nv, kernel-64k-core-6.12.0-231.14.el10nv +32

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
NVIDIA for RHEL 10Fixed RHSA-2026:34927
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:34911
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:35840
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:34911, RHSA-2026:43826
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:35840
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:34911
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:35840
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:34911
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:35840
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:34911
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:35840
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-08-27 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2026-53362
  3. 2026-10-03 Alias added: GHSA-3x6f-vm7x-cgm7

References

Patch 6

Advisory 1

  • 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