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TI-2026-34044 Aliases CVE-2026-46323GHSA-hf4r-hm8m-w52j

net: gro: don't merge zcopy skbs

Priority LOW 35CWE-416Published · 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
Partial Red Hat: 30 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00137 3rd percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.1.176, 6.6.142, 6.12.92 +3Red Hat: 15 advisoriesRed Hat: 30 fixed, 2 without a fix

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 later6.1.176, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1Patch availableCNA
  • Linux VendorLinux Affected 6.0 and later Fixed in 6.1.176, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.0 to before 6.1.176; 6.2 to before 6.6.142; 6.7 to before 6.12.92; 6.13 to before 6.18.34; 6.19 to before 7.0.11VulnerableLinux
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 6.0 to before 6.1.176; 6.2 to before 6.6.142; 6.7 to before 6.12.92; 6.13 to before 6.18.34; 6.19 to before 7.0.11 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

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.1.176, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1

Red Hat 15 advisories

  • RHSA-2026:67935 Released 2026-09-24 · Red Hat rating Important
    OpenShift Container Platform 4.16.71 bug fix and security update
    • Red Hat OpenShift Container Platform 4.16 rhcos-aarch64-416.94.202609140240-0, rhcos-ppc64le-416.94.202609140240-0, rhcos-s390x-416.94.202609140240-0 +1
  • RHSA-2026:62641 Released 2026-09-02 · Red Hat rating Important
    kpatch-patch-5_14_0-570_116_1, kpatch-patch-5_14_0-570_17_1, kpatch-patch-5_14_0-570_39_1, kpatch-patch-5_14_0-570_66_1, and kpatch-patch-5_14_0-570_94_1 security update
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kpatch-patch-5_14_0-570_116_1-1-9.el9_6, kpatch-patch-5_14_0-570_17_1-1-24.el9_6, kpatch-patch-5_14_0-570_39_1-1-15.el9_6 +2
  • RHSA-2026:62640 Released 2026-09-02 · Red Hat rating Important
    kpatch-patch-5_14_0-687_10_1 security update
    • Red Hat Enterprise Linux BaseOS (v. 9) kpatch-patch-5_14_0-687_10_1-1-8.el9_8
Show 12 more Red Hat advisories
  • RHSA-2026:62642 Released 2026-09-02 · 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_1-1-8.el10_2
  • RHSA-2026:62639 Released 2026-09-02 · Red Hat rating Important
    kpatch-patch-5_14_0-427_100_1, kpatch-patch-5_14_0-427_113_1, kpatch-patch-5_14_0-427_126_1, kpatch-patch-5_14_0-427_68_2, and kpatch-patch-5_14_0-427_84_1 security update
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) kpatch-patch-5_14_0-427_100_1-1-14.el9_4, kpatch-patch-5_14_0-427_113_1-1-12.el9_4, kpatch-patch-5_14_0-427_126_1-1-9.el9_4 +2
  • RHSA-2026:47727 Released 2026-08-06 · Red Hat rating Important
    OpenShift Container Platform 4.17.56 bug fix and security update
    • Red Hat OpenShift Container Platform 4.17 rhcos-aarch64-417.94.202607240132-0, rhcos-ppc64le-417.94.202607240132-0, rhcos-s390x-417.94.202607240132-0 +1
  • RHSA-2026:44230 Released 2026-07-29 · Red Hat rating Important
    OpenShift Container Platform 4.18.50 bug fix and security update
    • Red Hat OpenShift Container Platform 4.18 rhcos-aarch64-418.94.202607211754-0, rhcos-ppc64le-418.94.202607211754-0, rhcos-s390x-418.94.202607211754-0 +1
  • RHSA-2026:44231 Released 2026-07-29 · Red Hat rating Important
    OpenShift Container Platform 4.19.40 bug fix and security update
    • Red Hat OpenShift Container Platform 4.19 rhcos-aarch64-4.19.9.6.202607220857-0, rhcos-ppc64le-4.19.9.6.202607220857-0, rhcos-s390x-4.19.9.6.202607220857-0 +1
  • RHSA-2026:44262 Released 2026-07-28 · Red Hat rating Important
    OpenShift Container Platform 4.21.26 bug fix and security update
    • Red Hat OpenShift Container Platform 4.21 rhcos-aarch64-4.21.9.6.202607221317-0, rhcos-ppc64le-4.21.9.6.202607221317-0, rhcos-s390x-4.21.9.6.202607221317-0 +1
  • RHSA-2026:44259 Released 2026-07-28 · Red Hat rating Important
    OpenShift Container Platform 4.20.31 bug fix and security update
    • Red Hat OpenShift Container Platform 4.20 rhcos-aarch64-4.20.9.6.202607221038-0, rhcos-ppc64le-4.20.9.6.202607221038-0, rhcos-s390x-4.20.9.6.202607221038-0 +1
  • RHSA-2026:44270 Released 2026-07-23 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.38.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.38.1.el10_2, kernel-64k-devel-6.12.0-211.38.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.38.1.el10_2, kernel-64k-6.12.0-211.38.1.el10_2, kernel-64k-core-6.12.0-211.38.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.38.1.el10_2, libperf-6.12.0-211.38.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.38.1.el10_2, kernel-rt-64k-6.12.0-211.38.1.el10_2, kernel-rt-64k-core-6.12.0-211.38.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.38.1.el10_2, kernel-rt-core-6.12.0-211.38.1.el10_2, kernel-rt-debug-6.12.0-211.38.1.el10_2 +9
  • RHSA-2026:36018 Released 2026-07-06 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.22.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.22.1.el9_8, kernel-64k-devel-5.14.0-687.22.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.22.1.el9_8, kernel-64k-5.14.0-687.22.1.el9_8, kernel-64k-core-5.14.0-687.22.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.22.1.el9_8, libperf-5.14.0-687.22.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.22.1.el9_8, kernel-rt-64k-5.14.0-687.22.1.el9_8, kernel-rt-64k-core-5.14.0-687.22.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.22.1.el9_8, kernel-rt-core-5.14.0-687.22.1.el9_8, kernel-rt-debug-5.14.0-687.22.1.el9_8 +9
  • RHSA-2026:27708 Released 2026-06-22 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.123.1.el9_6, libperf-5.14.0-570.123.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.123.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.123.1.el9_6, kernel-64k-devel-5.14.0-570.123.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.123.1.el9_6, kernel-64k-5.14.0-570.123.1.el9_6, kernel-64k-core-5.14.0-570.123.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.123.1.el9_6, kernel-rt-64k-5.14.0-570.123.1.el9_6, kernel-rt-64k-core-5.14.0-570.123.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.123.1.el9_6, kernel-rt-core-5.14.0-570.123.1.el9_6, kernel-rt-debug-5.14.0-570.123.1.el9_6 +11
  • RHSA-2026:27735 Released 2026-06-22 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.132.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.132.1.el9_4, kernel-64k-devel-5.14.0-427.132.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.132.1.el9_4, kernel-5.14.0-427.132.1.el9_4, kernel-64k-5.14.0-427.132.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.132.1.el9_4, kernel-rt-core-5.14.0-427.132.1.el9_4, kernel-rt-debug-5.14.0-427.132.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.132.1.el9_4, kernel-rt-core-5.14.0-427.132.1.el9_4, kernel-rt-debug-5.14.0-427.132.1.el9_4 +11
  • RHSA-2026:27731 Released 2026-06-22 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.82.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.82.1.el10_0, kernel-64k-devel-6.12.0-55.82.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.82.1.el10_0, kernel-64k-6.12.0-55.82.1.el10_0, kernel-64k-core-6.12.0-55.82.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.82.1.el10_0, libperf-6.12.0-55.82.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.82.1.el10_0, kernel-rt-64k-6.12.0-55.82.1.el10_0, kernel-rt-64k-core-6.12.0-55.82.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.82.1.el10_0, kernel-rt-core-6.12.0-55.82.1.el10_0, kernel-rt-debug-6.12.0-55.82.1.el10_0 +11

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux for NVIDIA 26AffectedNo fix planned: Will not fix
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:27708
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:44270
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:27735
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:27731
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:27708
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:44270, RHSA-2026:62642
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:36018, RHSA-2026:62640
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:27735, RHSA-2026:62639
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:27731
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:27708, RHSA-2026:62641
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:44270
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:27731
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:44270
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux Real Time E4S (v.9.4)Fixed RHSA-2026:27735
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:27731
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:27708
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:44270
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:36018
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)Fixed RHSA-2026:27735
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:27731
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:27708
Red Hat OpenShift Container Platform 4.16Fixed RHSA-2026:67935
Red Hat OpenShift Container Platform 4.17Fixed RHSA-2026:47727
Red Hat OpenShift Container Platform 4.18Fixed RHSA-2026:44230
Red Hat OpenShift Container Platform 4.19Fixed RHSA-2026:44231
Red Hat OpenShift Container Platform 4.20Fixed RHSA-2026:44259
Red Hat OpenShift Container Platform 4.21Fixed RHSA-2026:44262
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-2026-46323
  2. 2026-10-03 Alias added: GHSA-hf4r-hm8m-w52j
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-19 Weakness changed · CISA ADP

References

Patch 6

Advisory 7

  • 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