net: let net.core.dev_weight always be non-zero
In the Linux kernel, the following vulnerability has been resolved: net: let net.core.dev_weight always be non-zero The following problem was encountered during stability test: (NULL net_device): NAPI poll function process_backlog+0x0/0x530 \ returned 1, exceeding its budget of 0. ------------[ cut here ]------------ list_add double add: new=ffff88905f746f48, prev=ffff88905f746f48, \ next=ffff88905f746e40. WARNING: CPU: 18 PID: 5462 at lib/list_debug.c:35 \ __list_add_valid_or_report+0xf3/0x130 CPU: 18 UID: 0 PID: 5462 Comm: ping Kdump: loaded Not tainted 6.13.0-rc7+ RIP: 0010:__list_add_valid_or_report+0xf3/0x130 Call Trace: ? __warn+0xcd/0x250 ? __list_add_valid_or_report+0xf3/0x130 enqueue_to_backlog+0x923/0x1070 netif_rx_internal+0x92/0x2b0 __netif_rx+0x15/0x170 loopback_xmit+0x2ef/0x450 dev_hard_start_xmit+0x103/0x490 __dev_queue_xmit+0xeac/0x1950 ip_finish_output2+0x6cc/0x1620 ip_output+0x161/0x270 ip_push_pending_frames+0x155/0x1a0 raw_sendmsg+0xe13/0x1550 __sys_sendto+0x3bf/0x4e0 __x64_sys_sendto+0xdc/0x1b0 do_syscall_64+0x5b/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e The reproduction command is as follows: sysctl -w net.core.dev_weight=0 ping 127.0.0.1 This is because when the napi's weight is set to 0, process_backlog() may return 0 and clear the NAPI_STATE_SCHED bit of napi->state, causing this napi to be re-polled in net_rx_action() until __do_softirq() times out. Since the NAPI_STATE_SCHED bit has been cleared, napi_schedule_rps() can be retriggered in enqueu
CVE-2025-21806
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-2025-21806
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": "e3876605450979fe52a1a03e7eb78a89bf59e76a",
"lessThan": "d0e0f9c8218826926d7692980c98236d9f21fd3c",
"versionType": "git"
},
{
"status": "affected",
"version": "e3876605450979fe52a1a03e7eb78a89bf59e76a",
"lessThan": "c337c08819a4ec49edfdcd8fc46fbee120d8a5b2",
"versionType": "git"
},
{
"status": "affected",
"version": "e3876605450979fe52a1a03e7eb78a89bf59e76a",
"lessThan": "0e2f1d93d287d544d26f8ff293ea820a8079b9f8",
"versionType": "git"
},
{
"status": "affected",
"version": "e3876605450979fe52a1a03e7eb78a89bf59e76a",
"lessThan": "5860abbf15eeb61838b5e32e721ba67b0aa84450",
"versionType": "git"
},
{
"status": "affected",
"version": "e3876605450979fe52a1a03e7eb78a89bf59e76a",
"lessThan": "6ce38b5a6a49e65bad163162a54cb3f104c40b48",
"versionType": "git"
},
{
"status": "affected",
"version": "e3876605450979fe52a1a03e7eb78a89bf59e76a",
"lessThan": "33e2168788f8fb5cb8bd4f36cb1ef37d1d34dada",
"versionType": "git"
},
{
"status": "affected",
"version": "e3876605450979fe52a1a03e7eb78a89bf59e76a",
"lessThan": "1489824e5226a26841c70639ebd2d1aed390764b",
"versionType": "git"
},
{
"status": "affected",
"version": "e3876605450979fe52a1a03e7eb78a89bf59e76a",
"lessThan": "d1f9f79fa2af8e3b45cffdeef66e05833480148a",
"versionType": "git"
}
],
"programFiles": [
"net/core/sysctl_net_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.291",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.235",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.129",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.76",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.13",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.2",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/sysctl_net_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21806
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26950 · Revision 1
- Added to Heist Feed
- Publisher date