udp: fix potential use-after-free in tunnel segmentation
Published Aug 22, 2026
10.0
CRITICALCVSS 3.1
EPSS 0.50%
Description
__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head, the saved UDP header pointer is no longer valid.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.
Affected products
-
Affected
- ≥ , <
- ≥ , <
- ≥ , <
- ≥ , <
- ≥ , <
- ≥ , <
- ≥ , <
- ≥ , <
-
Affected
- 4.6
Unaffected
- ≥ 0, < 4.6
- ≥ 5.10.265, ≤ 5.10.*
- ≥ 5.15.216, ≤ 5.15.*
- ≥ 6.1.183, ≤ 6.1.*
- ≥ 6.12.104, ≤ 6.12.*
- ≥ 6.18.45, ≤ 6.18.*
- ≥ 6.6.152, ≤ 6.6.*
- ≥ 7.1.9, ≤ 7.1.*
- 7.2
Default status is the baseline for the product. Each version can override it (patched versions can be marked unaffected).
| Vendor | Product | Default status | Versions |
|---|---|---|---|
| Linux | Linux | unaffected | Affected
|
| Linux | Linux | affected | Affected
Unaffected
|
No data.
No data.
Red Hat Enterprise Linux 10
kernel
Affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Affected
Red Hat Enterprise Linux 7
kernel-rt
Affected
Red Hat Enterprise Linux 8
kernel
Affected
Red Hat Enterprise Linux 8
kernel-rt
Affected
Red Hat Enterprise Linux 9
kernel
Affected
Red Hat Enterprise Linux 9
kernel-rt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (14)
- https://access.redhat.com/security/cve/CVE-2026-74705 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2521498 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-64392 Advisory
- https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f
- https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55
- https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b
- https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d
- https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe
- https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87
- https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442
- https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61
- https://lore.kernel.org/linux-cve-announce/2026082236-CVE-2026-74705-49e4@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2026-74705
- https://www.cve.org/CVERecord?id=CVE-2026-74705
Change history (0)
No recorded changes yet.
CVE.org / MITRE
CISA Vulnrichment
No data
GitHub
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