CVE-2026-74550net: do not send ICMP/NDISC Redirects when peer allocation fails
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 92d8682926342d2b6aa5b2ecc02221e00e1573a0 before c0adf8b4247bcc5a145a25c1929006eb392580bb; from 92d8682926342d2b6aa5b2ecc02221e00e1573a0 before f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1; from 92d8682926342d2b6aa5b2ecc02221e00e1573a0 before 21666f7af49a90ef44d474916b8ef4402dfd74f5; 92d8682926342d2b6aa5b2ecc02221e00e1573a0 builds before 5ec5f00fc606a6df8434948c4552b3cb1176595d; from 92d8682926342d2b6aa5b2ecc02221e00e1573a0 before 828f6670d110ff2bf44c743037b38badc315704c; from 92d8682926342d2b6aa5b2ecc02221e00e1573a0 before dbc3791e3b2472e1ccc08947e0f83b443470ff4f | CNA record |
References
- https://git.kernel.org/stable/c/c0adf8b4247bcc5a145a25c1929006eb392580bb
- https://git.kernel.org/stable/c/f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1
- https://git.kernel.org/stable/c/21666f7af49a90ef44d474916b8ef4402dfd74f5
- https://git.kernel.org/stable/c/5ec5f00fc606a6df8434948c4552b3cb1176595d
- https://git.kernel.org/stable/c/828f6670d110ff2bf44c743037b38badc315704c
- https://git.kernel.org/stable/c/dbc3791e3b2472e1ccc08947e0f83b443470ff4f
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.