net: do not send ICMP/NDISC Redirects when peer allocation fails

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74550
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:18:00 UTC
Updated2026-08-17 06:19:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: do not send ICMP/NDISC Redirects when peer allocation fails When inet_getpeer_v4() or inet_getpeer_v6() fails to allocate a peer entry under memory pressure or tree size caps, redirect handlers previously fell back to sending un-rate-limited ICMP/NDISC Redirect messages. In IPv4, ip_rt_send_redirect() called icmp_send() directly when peer == NULL. In IPv6, ip6_forward() and ndisc_send_redirect() passed a NULL peer into inet_peer_xrlim_allow(), which returned true when peer == NULL. Because ICMP/NDISC Redirects are not part of the default global rate limit mask (sysctl_icmp_ratemask), sending redirects when peer == NULL creates an un-rate-limited ICMP packet storm. Fix this by failing closed in ip_rt_send_redirect(), ip6_forward(), and ndisc_send_redirect() when peer is NULL.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001680000 probability, percentile 0.065770000 (date 2026-08-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 92d8682926342d2b6aa5b2ecc02221e00e1573a0 f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1 git Not specified
CNA Linux Linux affected 92d8682926342d2b6aa5b2ecc02221e00e1573a0 21666f7af49a90ef44d474916b8ef4402dfd74f5 git Not specified
CNA Linux Linux affected 92d8682926342d2b6aa5b2ecc02221e00e1573a0 5ec5f00fc606a6df8434948c4552b3cb1176595d git Not specified
CNA Linux Linux affected 92d8682926342d2b6aa5b2ecc02221e00e1573a0 828f6670d110ff2bf44c743037b38badc315704c git Not specified
CNA Linux Linux affected 92d8682926342d2b6aa5b2ecc02221e00e1573a0 dbc3791e3b2472e1ccc08947e0f83b443470ff4f git Not specified
CNA Linux Linux affected 2.6.39 Not specified
CNA Linux Linux unaffected 2.6.39 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dbc3791e3b2472e1ccc08947e0f83b443470ff4f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ec5f00fc606a6df8434948c4552b3cb1176595d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21666f7af49a90ef44d474916b8ef4402dfd74f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/828f6670d110ff2bf44c743037b38badc315704c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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