bpf: Disable migration in nf_hook_run_bpf().
In the Linux kernel, the following vulnerability has been resolved: bpf: Disable migration in nf_hook_run_bpf(). syzbot reported that the netfilter bpf prog can be called without migration disabled in xmit path. Then the assertion in __bpf_prog_run() fails, triggering the splat below. [0] Let's use bpf_prog_run_pin_on_cpu() in nf_hook_run_bpf(). [0]: BUG: assuming non migratable context at ./include/linux/filter.h:703 in_atomic(): 0, irqs_disabled(): 0, migration_disabled() 0 pid: 5829, name: sshd-session 3 locks held by sshd-session/5829: #0: ffff88807b4e4218 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline] #0: ffff88807b4e4218 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x20/0x50 net/ipv4/tcp.c:1395 #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: __ip_queue_xmit+0x69/0x26c0 net/ipv4/ip_output.c:470 #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: nf_hook+0xb2/0x680 include/linux/netfilter.h:241 CPU: 0 UID: 0 PID: 5829 Comm: sshd-session Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) Hard
CVE-2025-38640
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-2025-38640
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": "fd9c663b9ad67dedfc9a3fd3429ddd3e83782b4d",
"lessThan": "ee2502485702e4398cd74dbfb288bfa111d25e62",
"versionType": "git"
},
{
"status": "affected",
"version": "fd9c663b9ad67dedfc9a3fd3429ddd3e83782b4d",
"lessThan": "62f6175d145e00fc999fd2fcbffad3f59253c66a",
"versionType": "git"
},
{
"status": "affected",
"version": "fd9c663b9ad67dedfc9a3fd3429ddd3e83782b4d",
"lessThan": "e0199c28167a8a4adec036005a8df268b2b68529",
"versionType": "git"
},
{
"status": "affected",
"version": "fd9c663b9ad67dedfc9a3fd3429ddd3e83782b4d",
"lessThan": "0a356da16fb933abbeeb7aea038c351f3342cd3f",
"versionType": "git"
},
{
"status": "affected",
"version": "fd9c663b9ad67dedfc9a3fd3429ddd3e83782b4d",
"lessThan": "17ce3e5949bc37557305ad46316f41c7875d6366",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_bpf_link.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.102",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.42",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.10",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16.1",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nf_bpf_link.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38640
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30604 · Revision 1
- Added to Heist Feed
- Publisher date