netlink: avoid infinite retry looping in netlink_unicast()
In the Linux kernel, the following vulnerability has been resolved: netlink: avoid infinite retry looping in netlink_unicast() netlink_attachskb() checks for the socket's read memory allocation constraints. Firstly, it has: rmem < READ_ONCE(sk->sk_rcvbuf) to check if the just increased rmem value fits into the socket's receive buffer. If not, it proceeds and tries to wait for the memory under: rmem + skb->truesize > READ_ONCE(sk->sk_rcvbuf) The checks don't cover the case when skb->truesize + sk->sk_rmem_alloc is equal to sk->sk_rcvbuf. Thus the function neither successfully accepts these conditions, nor manages to reschedule the task - and is called in retry loop for indefinite time which is caught as: rcu: INFO: rcu_sched self-detected stall on CPU rcu: 0-....: (25999 ticks this GP) idle=ef2/1/0x4000000000000000 softirq=262269/262269 fqs=6212 (t=26000 jiffies g=230833 q=259957) NMI backtrace for cpu 0 CPU: 0 PID: 22 Comm: kauditd Not tainted 5.10.240 #68 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-4.fc42 04/01/2014 Call Trace: dump_stack lib/dump_stack.c:120 nmi_cpu_backtrace.cold lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace lib/nmi_backtrace.c:62 rcu_dump_cpu_stacks kernel/rcu/tree_stall.h:335 rcu_sched_clock_irq.cold kernel/rcu/tree.c:2590 update_process_times kernel/time/timer.c:1953 tick_sched_handle kernel/time/tick-sched.c:227 tick_sched_timer kernel/time/tick-sched.c:1399 __hrtimer_run_queues kernel/time/hrtimer.c:1652 hrtimer_interrup
CVE-2025-38727
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-2025-38727
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": "9da025150b7c14a8390fc06aea314c0a4011e82c",
"lessThan": "47d49fd07f86d1f55ea1083287303d237e9e0922",
"versionType": "git"
},
{
"status": "affected",
"version": "c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98",
"lessThan": "6bee383ff83352a693d03efdf27cdd80742f71b2",
"versionType": "git"
},
{
"status": "affected",
"version": "fd69af06101090eaa60b3d216ae715f9c0a58e5b",
"lessThan": "f324959ad47e62e3cadaffa65d3cff790fb48529",
"versionType": "git"
},
{
"status": "affected",
"version": "76602d8e13864524382b0687dc32cd8f19164d5a",
"lessThan": "d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e",
"versionType": "git"
},
{
"status": "affected",
"version": "55baecb9eb90238f60a8350660d6762046ebd3bd",
"lessThan": "346c820ef5135cf062fa3473da955ef8c5fb6929",
"versionType": "git"
},
{
"status": "affected",
"version": "4b8e18af7bea92f8b7fb92d40aeae729209db250",
"lessThan": "44ddd7b1ae0b7edb2c832eb16798c827a05e58f0",
"versionType": "git"
},
{
"status": "affected",
"version": "cd7ff61bfffd7000143c42bbffb85eeb792466d6",
"lessThan": "78fcd69d55c5f11d7694c547eca767a1cfd38ec4",
"versionType": "git"
},
{
"status": "affected",
"version": "ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc",
"lessThan": "e8edc7de688791a337c068693f22e8d8b869df71",
"versionType": "git"
},
{
"status": "affected",
"version": "ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc",
"lessThan": "759dfc7d04bab1b0b86113f1164dc1fec192b859",
"versionType": "git"
},
{
"status": "affected",
"version": "5.4.296",
"lessThan": "5.4.297",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.240",
"lessThan": "5.10.241",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.189",
"lessThan": "5.15.190",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.146",
"lessThan": "6.1.149",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.99",
"lessThan": "6.6.103",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.39",
"lessThan": "6.12.43",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.15.7",
"lessThan": "6.15.11",
"versionType": "semver"
}
],
"programFiles": [
"net/netlink/af_netlink.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.297",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.241",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.190",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.149",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.103",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.43",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.11",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16.2",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netlink/af_netlink.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38727
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27054 · Revision 1
- Added to Heist Feed
- Publisher date