l2tp: avoid one data-race in l2tp_tunnel_del_work()
In the Linux kernel, the following vulnerability has been resolved: l2tp: avoid one data-race in l2tp_tunnel_del_work() We should read sk->sk_socket only when dealing with kernel sockets. syzbot reported the following data-race: BUG: KCSAN: data-race in l2tp_tunnel_del_work / sk_common_release write to 0xffff88811c182b20 of 8 bytes by task 5365 on cpu 0: sk_set_socket include/net/sock.h:2092 [inline] sock_orphan include/net/sock.h:2118 [inline] sk_common_release+0xae/0x230 net/core/sock.c:4003 udp_lib_close+0x15/0x20 include/net/udp.h:325 inet_release+0xce/0xf0 net/ipv4/af_inet.c:437 __sock_release net/socket.c:662 [inline] sock_close+0x6b/0x150 net/socket.c:1455 __fput+0x29b/0x650 fs/file_table.c:468 ____fput+0x1c/0x30 fs/file_table.c:496 task_work_run+0x131/0x1a0 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x1fe/0x740 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x1e1/0x2b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811c182b20 of 8 bytes by task 827 on cpu 1: l2tp_tunnel_del_work+0x2f/0x1a0 net/l2tp/l2tp_core.c:1418 pro
CVE-2026-23120
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-2026-23120
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": "d00fa9adc528c1b0e64d532556764852df8bd7b9",
"lessThan": "1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4",
"versionType": "git"
},
{
"status": "affected",
"version": "d00fa9adc528c1b0e64d532556764852df8bd7b9",
"lessThan": "36c40a80109f1771d59558050b1a71e13c60c759",
"versionType": "git"
},
{
"status": "affected",
"version": "d00fa9adc528c1b0e64d532556764852df8bd7b9",
"lessThan": "eae074dab764ea181bbed5e88626889319177498",
"versionType": "git"
},
{
"status": "affected",
"version": "d00fa9adc528c1b0e64d532556764852df8bd7b9",
"lessThan": "68e92085427c84e7679ddb53c0d68836d220b6e7",
"versionType": "git"
},
{
"status": "affected",
"version": "d00fa9adc528c1b0e64d532556764852df8bd7b9",
"lessThan": "3d6d414b214ce31659bded2f8df50c93a3769474",
"versionType": "git"
},
{
"status": "affected",
"version": "d00fa9adc528c1b0e64d532556764852df8bd7b9",
"lessThan": "32d417497b79efb403d75f4c185fe6fd9d64b94f",
"versionType": "git"
},
{
"status": "affected",
"version": "d00fa9adc528c1b0e64d532556764852df8bd7b9",
"lessThan": "7a29f6bf60f2590fe5e9c4decb451e19afad2bcf",
"versionType": "git"
},
{
"status": "affected",
"version": "15df699fdc5af46a9fb15ae2d9326294852de5b5",
"versionType": "git"
},
{
"status": "affected",
"version": "18bdaefc715b4530b4b2fe670506bb47713664cc",
"versionType": "git"
},
{
"status": "affected",
"version": "3.16.57",
"lessThan": "3.17",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.15.8",
"lessThan": "4.16",
"versionType": "semver"
}
],
"programFiles": [
"net/l2tp/l2tp_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": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.249",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.199",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.162",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.122",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.68",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.8",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/l2tp/l2tp_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23120
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #39760 · Revision 1
- Added to Heist Feed
- Publisher date