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CVE

CVE-2026-74669

ipvs: clear IPv4 options after rebasing tunnel ICMP errors
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CVE

CVE-2026-74669

ipvs: clear IPv4 options after rebasing tunnel ICMP errors

In the Linux kernel, the following vulnerability has been resolved:

ipvs: clear IPv4 options after rebasing tunnel ICMP errors

ipvsin_icmp() rebases an skb from the outer ICMP packet to the

quoted original request before passing it to icmp_send(). However,

IPCB(skb)->opt still describes the outer IPv4 header.

A timestamp option in the outer header can therefore leave an offset

that points into the quoted transport header after the rebase.

_ipoptions_echo() treats a byte at that stale location as the option

length and copies it into the fixed-size option storage on the

_icmpsend() stack, causing a stack out-of-bounds write.

Clear the stale option metadata after resetting the network header.

Keep the remaining control block fields, including the ingress

interface used by the ICMP response path.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/37c61b3745129cbd682c557b51345828120972e5, https://git.kernel.org/stable/c/384b4dae14277d369221d187e9b3af56c79d2e50, https://git.kernel.org/stable/c/6f46fc460e9316062bdcdf89199eb5d7a33da33b, https://git.kernel.org/stable/c/75eec935444db4af2123e0491936f6e273d7ea00, https://git.kernel.org/stable/c/79ffa99202c944467e28b13b513bf2998732edff, https://git.kernel.org/stable/c/c9413b50204738fbc429bb86bf01353c393a6c28, https://git.kernel.org/stable/c/e0ba936287dfe9783426aac27e5fd76fe35b38c9, https://git.kernel.org/stable/c/ed246dd85ebf27c1f6b7897834d40786c0ca3006, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74669.json, https://nvd.nist.gov/vuln/detail/CVE-2026-74669, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00755%
EPSS Percentile
0.53292%
Introduced Version
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e,3.7.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
e0ba936287dfe9783426aac27e5fd76fe35b38c9,5.10.265,5.15.216,6.1.183,6.6.152,6.12.104,6.18.45,7.1.9,6.1.187-1,6.12.107-1~deb12u1,6.12.105-1,0:6.12.0-206.104.3.3.el10uek,0:5.15.0-324.217.5.2.el8uek,0:5.15.0-324.217.5.2.el9uek,0:6.12.0-206.104.3.3.el9uek,0:5.10.265-265.1078.amzn2,0:1.0-0.amzn2,0:5.15.220-153.252.amzn2,1:6.1.186-228.374.amzn2023,1:1.0-0.amzn2023,1:6.18.48-107.148.amzn2023

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