CVE-2026-23442

In the Linux kernel, the following vulnerability has been resolved: ipv6: add NULL checks for idev in SRv6 paths __in6_dev_get() can return NULL when the device has no IPv6 configuration (e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGISTER). Add NULL checks for idev returned by __in6_dev_get() in both seg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL pointer dereferences.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4
https://git.kernel.org/stable/c/06413793526251870e20402c39930804f14d59c0	Patch
https://git.kernel.org/stable/c/50352fc103928e10e8729abc79a0d05abef26c4d
https://git.kernel.org/stable/c/83d705d35e583cb1b1eacf196dfe7b77d442018e
https://git.kernel.org/stable/c/a25853c9feea7bbf31d157ff6e004d2d3b4f7f13	Patch
https://git.kernel.org/stable/c/bc9843c39f9932a8b36efd1d362ea00bb88e4e78	Patch
https://git.kernel.org/stable/c/c5cedee5d97382176573bbe21e1724e737a5eb64
https://git.kernel.org/stable/c/d1bd8b9edc6752d10f84d28ff64f842401ce336d

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:4.10:-::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc1::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc2::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc3::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc4::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc5::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc6::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc7::::::

History

No history.

Information

Published : 2026-04-03 16:16

Updated : 2026-07-24 21:10

NVD link : CVE-2026-23442

Mitre link : CVE-2026-23442

CVE.ORG link : CVE-2026-23442

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-476

NULL Pointer Dereference

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"version": "6.19.10", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/exthdrs.c", "net/ipv6/seg6_hmac.c"], "defaultStatus": "affected"}]}], "published": "2026-04-03T16:16:28.423", "references": [{"url": "https://git.kernel.org/stable/c/0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/06413793526251870e20402c39930804f14d59c0", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/50352fc103928e10e8729abc79a0d05abef26c4d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/83d705d35e583cb1b1eacf196dfe7b77d442018e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a25853c9feea7bbf31d157ff6e004d2d3b4f7f13", "tags": 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both\nseg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL\npointer dereferences."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipv6: a\u00f1adir comprobaciones de NULL para idev en las rutas SRv6\n\n__in6_dev_get() puede devolver NULL cuando el dispositivo no tiene configuraci\u00f3n IPv6 (p. ej., MTU < IPV6_MIN_MTU o despu\u00e9s de NETDEV_UNREGISTER).\n\nA\u00f1adir comprobaciones de NULL para idev devuelto por __in6_dev_get() tanto en seg6_hmac_validate_skb() como en ipv6_srh_rcv() para prevenir posibles desreferencias de puntero NULL."}], "lastModified": "2026-07-24T21:10:00.143", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C9FB8914-AA64-42C8-B1C5-31091B1EAA92", "versionEndExcluding": "6.12.83", "versionStartIncluding": "4.10.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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