udp: fix potential use-after-free in tunnel segmentation
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
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: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.
Why it matters now
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
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2
Red Hat 17 advisories
- RHSA-2026:95601 Released 2026-11-05 · Red Hat rating Importantkpatch-patch-4_18_0-477_107_1, kpatch-patch-4_18_0-477_120_1, kpatch-patch-4_18_0-477_130_1, kpatch-patch-4_18_0-477_143_1, and kpatch-patch-4_18_0-477_161_1 security update
- Red Hat Enterprise Linux BaseOS E4S (v.8.8) kpatch-patch-4_18_0-477_107_1-1-18.el8_8, kpatch-patch-4_18_0-477_120_1-1-17.el8_8, kpatch-patch-4_18_0-477_130_1-1-15.el8_8 +2
- RHSA-2026:95600 Released 2026-11-05 · Red Hat rating Importantkpatch-patch-5_14_0-284_134_1, kpatch-patch-5_14_0-284_148_1, kpatch-patch-5_14_0-284_158_1, kpatch-patch-5_14_0-284_172_1, and kpatch-patch-5_14_0-284_188_1 security update
- Red Hat Enterprise Linux BaseOS E4S (v.9.2) kpatch-patch-5_14_0-284_134_1-1-19.el9_2, kpatch-patch-5_14_0-284_148_1-1-17.el9_2, kpatch-patch-5_14_0-284_158_1-1-15.el9_2 +2
- RHSA-2026:95587 Released 2026-11-05 · Red Hat rating Importantkpatch-patch-4_18_0-553_109_1, kpatch-patch-4_18_0-553_125_1, kpatch-patch-4_18_0-553_158_1, kpatch-patch-4_18_0-553_72_1, and kpatch-patch-4_18_0-553_85_1 security update
- Red Hat Enterprise Linux BaseOS (v. 8) kpatch-patch-4_18_0-553_109_1-1-15.el8_10, kpatch-patch-4_18_0-553_125_1-1-12.el8_10, kpatch-patch-4_18_0-553_158_1-1-4.el8_10 +2
Show 14 more Red Hat advisories
- RHSA-2026:83156 Released 2026-10-14 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.58.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.58.1.el9_8, kernel-64k-devel-5.14.0-687.58.1.el9_8 +12
- Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.58.1.el9_8, kernel-64k-5.14.0-687.58.1.el9_8, kernel-64k-core-5.14.0-687.58.1.el9_8 +28
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.58.1.el9_8, libperf-5.14.0-687.58.1.el9_8
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.58.1.el9_8, kernel-rt-64k-5.14.0-687.58.1.el9_8, kernel-rt-64k-core-5.14.0-687.58.1.el9_8 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.58.1.el9_8, kernel-rt-core-5.14.0-687.58.1.el9_8, kernel-rt-debug-5.14.0-687.58.1.el9_8 +9
- RHSA-2026:83157 Released 2026-10-14 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.174.1.el8_10, kernel-4.18.0-553.174.1.el8_10, kernel-abi-stablelists-4.18.0-553.174.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.174.1.el8_10
- RHSA-2026:83159 Released 2026-10-14 · Red Hat rating Importantkernel-rt security, bug fix, and enhancement update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.174.1.rt7.515.el8_10, kernel-rt-core-4.18.0-553.174.1.rt7.515.el8_10, kernel-rt-debug-4.18.0-553.174.1.rt7.515.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.174.1.rt7.515.el8_10, kernel-rt-core-4.18.0-553.174.1.rt7.515.el8_10, kernel-rt-debug-4.18.0-553.174.1.rt7.515.el8_10 +7
- RHSA-2026:82860 Released 2026-10-14 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.197.1.rt14.482.el9_2, kernel-rt-core-5.14.0-284.197.1.rt14.482.el9_2, kernel-rt-debug-5.14.0-284.197.1.rt14.482.el9_2 +9
- Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.197.1.rt14.482.el9_2, kernel-rt-core-5.14.0-284.197.1.rt14.482.el9_2, kernel-rt-debug-5.14.0-284.197.1.rt14.482.el9_2 +11
- RHSA-2026:81349 Released 2026-10-12 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.167.1.el7, kernel-3.10.0-1160.167.1.el7, kernel-abi-whitelists-3.10.0-1160.167.1.el7 +11
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.167.1.el7, kernel-tools-libs-devel-3.10.0-1160.167.1.el7
- RHSA-2026:81371 Released 2026-10-12 · Red Hat rating Importantkernel-rt security, bug fix, and enhancement update
- Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.167.1.rt56.1319.el7, kernel-rt-debug-3.10.0-1160.167.1.rt56.1319.el7, kernel-rt-debug-devel-3.10.0-1160.167.1.rt56.1319.el7 +4
- RHSA-2026:80908 Released 2026-10-12 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.197.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.197.1.el9_2, kernel-64k-devel-5.14.0-284.197.1.el9_2 +10
- Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.197.1.el9_2, kernel-5.14.0-284.197.1.el9_2, kernel-64k-5.14.0-284.197.1.el9_2 +29
- RHSA-2026:79786 Released 2026-10-09 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.4) kernel-64k-debug-devel-5.14.0-427.155.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.155.1.el9_4, kernel-64k-devel-5.14.0-427.155.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool-7.3.0-427.155.1.el9_4, kernel-5.14.0-427.155.1.el9_4, kernel-64k-5.14.0-427.155.1.el9_4 +29
- Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt-5.14.0-427.155.1.el9_4, kernel-rt-core-5.14.0-427.155.1.el9_4, kernel-rt-debug-5.14.0-427.155.1.el9_4 +9
- Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt-5.14.0-427.155.1.el9_4, kernel-rt-core-5.14.0-427.155.1.el9_4, kernel-rt-debug-5.14.0-427.155.1.el9_4 +11
- RHSA-2026:79784 Released 2026-10-09 · Red Hat rating Importantkernel security update
- Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.148.1.el9_6, libperf-5.14.0-570.148.1.el9_6
- Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.148.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.148.1.el9_6, kernel-64k-devel-5.14.0-570.148.1.el9_6 +12
- Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.148.1.el9_6, kernel-64k-5.14.0-570.148.1.el9_6, kernel-64k-core-5.14.0-570.148.1.el9_6 +28
- Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.148.1.el9_6, kernel-rt-64k-5.14.0-570.148.1.el9_6, kernel-rt-64k-core-5.14.0-570.148.1.el9_6 +21
- Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.148.1.el9_6, kernel-rt-core-5.14.0-570.148.1.el9_6, kernel-rt-debug-5.14.0-570.148.1.el9_6 +11
- RHSA-2026:79782 Released 2026-10-09 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.174.1.el8_8, kernel-4.18.0-477.174.1.el8_8, kernel-abi-stablelists-4.18.0-477.174.1.el8_8 +14
- Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.174.1.el8_8, kernel-4.18.0-477.174.1.el8_8, kernel-abi-stablelists-4.18.0-477.174.1.el8_8 +14
- RHSA-2026:79783 Released 2026-10-09 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.221.1.el8_6, kernel-4.18.0-372.221.1.el8_6, kernel-abi-stablelists-4.18.0-372.221.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.221.1.el8_6, kernel-4.18.0-372.221.1.el8_6, kernel-abi-stablelists-4.18.0-372.221.1.el8_6 +14
- RHSA-2026:79778 Released 2026-10-09 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.213.1.el8_4, kernel-4.18.0-305.213.1.el8_4, kernel-abi-stablelists-4.18.0-305.213.1.el8_4 +14
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.213.1.el8_4, kernel-4.18.0-305.213.1.el8_4, kernel-abi-stablelists-4.18.0-305.213.1.el8_4 +14
- RHSA-2026:77690 Released 2026-10-08 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- 10Base-SMTV kernel-modules-internal-6.12.0-211.64.1.el10_2
- Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.64.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.64.1.el10_2, kernel-64k-devel-6.12.0-211.64.1.el10_2 +12
- Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.64.1.el10_2, kernel-64k-6.12.0-211.64.1.el10_2, kernel-64k-core-6.12.0-211.64.1.el10_2 +29
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.64.1.el10_2, libperf-6.12.0-211.64.1.el10_2
- Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.64.1.el10_2
- Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.64.1.el10_2, kernel-rt-64k-6.12.0-211.64.1.el10_2, kernel-rt-64k-core-6.12.0-211.64.1.el10_2 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.64.1.el10_2, kernel-rt-core-6.12.0-211.64.1.el10_2, kernel-rt-debug-6.12.0-211.64.1.el10_2 +9
- RHSA-2026:77634 Released 2026-10-08 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.109.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.109.1.el10_0, kernel-64k-devel-6.12.0-55.109.1.el10_0 +12
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.109.1.el10_0, kernel-64k-6.12.0-55.109.1.el10_0, kernel-64k-core-6.12.0-55.109.1.el10_0 +28
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.109.1.el10_0, libperf-6.12.0-55.109.1.el10_0
- Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.109.1.el10_0, kernel-rt-64k-6.12.0-55.109.1.el10_0, kernel-rt-64k-core-6.12.0-55.109.1.el10_0 +21
- Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.109.1.el10_0, kernel-rt-core-6.12.0-55.109.1.el10_0, kernel-rt-debug-6.12.0-55.109.1.el10_0 +11
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| 10Base-SMTV | Fixed | RHSA-2026:77690 |
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:79784 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:77690 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:83156 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:80908 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:79786 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:77634 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:79784 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:77690 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2026:83157, RHSA-2026:95587 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:83156 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2026:79778 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2026:79783 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2026:79782, RHSA-2026:95601 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2026:80908, RHSA-2026:95600 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Fixed | RHSA-2026:79786 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:77634 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2026:79784 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:79778 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) | Fixed | RHSA-2026:79783 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2026:79782 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:83157 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:77690 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:83156 |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:77634 |
| Red Hat Enterprise Linux Hidden (v. 10) | Fixed | RHSA-2026:77690 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2026:83159 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2026:83159 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2026:77690 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2026:83156 |
| Red Hat Enterprise Linux Real Time E4S (v.9.2) | Fixed | RHSA-2026:82860 |
| Red Hat Enterprise Linux Real Time E4S (v.9.4) | Fixed | RHSA-2026:79786 |
| Red Hat Enterprise Linux Real Time EUS (v. 10.0) | Fixed | RHSA-2026:77634 |
| Red Hat Enterprise Linux Real Time EUS (v.9.6) | Fixed | RHSA-2026:79784 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2026:77690 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2026:83156 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) | Fixed | RHSA-2026:82860 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) | Fixed | RHSA-2026:79786 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) | Fixed | RHSA-2026:77634 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) | Fixed | RHSA-2026:79784 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:81349 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:81349 |
| Red Hat Enterprise Linux for Real Time (v. 7 ELS) | Fixed | RHSA-2026:81371 |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74705
- 2026-10-03 Alias added: GHSA-rcm8-q4cm-988v
- 2026-10-08 Fix available: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) +2 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79778 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79783 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:77690 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:77634 · Red Hat
- 2026-10-09 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) +8 · Red Hat
- 2026-10-10 Fix available: RHSA-2026:79782 · Red Hat
- 2026-10-10 Fix available: RHSA-2026:79784 · Red Hat
- 2026-10-10 Fix available: RHSA-2026:79786 · Red Hat
- 2026-10-10 Fix available: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.6) +8 · Red Hat
- 2026-10-12 Fix available: RHSA-2026:81371 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:80908 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:81349 · Red Hat
- 2026-10-13 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2), Red Hat Enterprise Linux Server (v. 7 ELS) +2 · Red Hat
- 2026-10-15 Fix available: RHSA-2026:82860 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:83159 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:83156 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:83157 · Red Hat
- 2026-10-16 Fix available: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux BaseOS (v. 9) +8 · Red Hat
- 2026-10-18 CISA SSVC decision points changed
- 2026-11-02 Affected versions changed · Red Hat
- 2026-11-05 Affected versions changed · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 Fix available: RHSA-2026:95587 · Red Hat
- 2026-11-06 Fix available: RHSA-2026:95601 · Red Hat
- 2026-11-06 Fix available: RHSA-2026:95600 · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87
- https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f
- https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442
- https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55
- https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b
- https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe
- https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d
- https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61
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Sources
- CVE-2026-74705 · CVE Program
- CVE-2026-74705 · NVD
- FIRST EPSS
- GHSA-rcm8-q4cm-988v · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74705 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences