net: do not send ICMP/NDISC Redirects when peer allocation fails
In 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.
CVE-2026-74550
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74550
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "92d8682926342d2b6aa5b2ecc02221e00e1573a0",
"lessThan": "c0adf8b4247bcc5a145a25c1929006eb392580bb",
"versionType": "git"
},
{
"status": "affected",
"version": "92d8682926342d2b6aa5b2ecc02221e00e1573a0",
"lessThan": "f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1",
"versionType": "git"
},
{
"status": "affected",
"version": "92d8682926342d2b6aa5b2ecc02221e00e1573a0",
"lessThan": "21666f7af49a90ef44d474916b8ef4402dfd74f5",
"versionType": "git"
},
{
"status": "affected",
"version": "92d8682926342d2b6aa5b2ecc02221e00e1573a0",
"lessThan": "5ec5f00fc606a6df8434948c4552b3cb1176595d",
"versionType": "git"
},
{
"status": "affected",
"version": "92d8682926342d2b6aa5b2ecc02221e00e1573a0",
"lessThan": "828f6670d110ff2bf44c743037b38badc315704c",
"versionType": "git"
},
{
"status": "affected",
"version": "92d8682926342d2b6aa5b2ecc02221e00e1573a0",
"lessThan": "dbc3791e3b2472e1ccc08947e0f83b443470ff4f",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/route.c",
"net/ipv6/ip6_output.c",
"net/ipv6/ndisc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.39"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.39",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/route.c",
"net/ipv6/ip6_output.c",
"net/ipv6/ndisc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74550
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33202 · Revision 1
- Added to Heist Feed
- Publisher date