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TI-2026-38452 Aliases CVE-2026-53366GHSA-r67c-r6r6-mj6m

ipv4: account for fraggap on the paged allocation path

Priority LOW 35CWE-131Published · 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-131 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: ipv4: account for fraggap on the paged allocation path In __ip_append_data(), when the paged-allocation branch is taken, alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap, but the fraggap bytes carried over from the previous skb are copied into the new skb's linear area at offset transhdrlen by the subsequent skb_copy_and_csum_bits(). The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount. 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00171 6th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.1.178, 6.6.144, 6.12.95 +3Red Hat: 3 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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 later6.1.178, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2Patch availableCNA
  • Linux VendorLinux Affected 6.0 and later Fixed in 6.1.178, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.0 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:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.0 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

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.178, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2

Red Hat 3 advisories

  • RHSA-2026:66180 Released 2026-09-10 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.46.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.46.1.el9_8, kernel-64k-devel-5.14.0-687.46.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.46.1.el9_8, kernel-64k-5.14.0-687.46.1.el9_8, kernel-64k-core-5.14.0-687.46.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.46.1.el9_8, libperf-5.14.0-687.46.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.46.1.el9_8, kernel-rt-64k-5.14.0-687.46.1.el9_8, kernel-rt-64k-core-5.14.0-687.46.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.46.1.el9_8, kernel-rt-core-5.14.0-687.46.1.el9_8, kernel-rt-debug-5.14.0-687.46.1.el9_8 +9
  • 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

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:34911
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:66180
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:35840
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:34911
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:66180
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 (v. 9)Fixed RHSA-2026:66180
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 (v. 9)Fixed RHSA-2026:66180
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 (v. 9)Fixed RHSA-2026:66180
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. 2026-10-02 Threatist record created from CVE-2026-53366
  2. 2026-10-03 Alias added: GHSA-r67c-r6r6-mj6m
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP
  5. 2026-10-29 Affected versions changed · Red Hat

References

Patch 5

Other 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