AI Score
Confidence
Low
EPSS
Percentile
13.0%
SSVC
Exploitation
none
Automatable
no
Technical Impact
partial
In the Linux kernel, the following vulnerability has been resolved:
team: fix null-ptr-deref when team device type is changed
Get a null-ptr-deref bug as follows with reproducer [1].
BUG: kernel NULL pointer dereference, address: 0000000000000228
…
RIP: 0010:vlan_dev_hard_header+0x35/0x140 [8021q]
…
Call Trace:
<TASK>
? __die+0x24/0x70
? page_fault_oops+0x82/0x150
? exc_page_fault+0x69/0x150
? asm_exc_page_fault+0x26/0x30
? vlan_dev_hard_header+0x35/0x140 [8021q]
? vlan_dev_hard_header+0x8e/0x140 [8021q]
neigh_connected_output+0xb2/0x100
ip6_finish_output2+0x1cb/0x520
? nf_hook_slow+0x43/0xc0
? ip6_mtu+0x46/0x80
ip6_finish_output+0x2a/0xb0
mld_sendpack+0x18f/0x250
mld_ifc_work+0x39/0x160
process_one_work+0x1e6/0x3f0
worker_thread+0x4d/0x2f0
? __pfx_worker_thread+0x10/0x10
kthread+0xe5/0x120
? __pfx_kthread+0x10/0x10
ret_from_fork+0x34/0x50
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1b/0x30
[1]
$ teamd -t team0 -d -c ‘{“runner”: {“name”: “loadbalance”}}’
$ ip link add name t-dummy type dummy
$ ip link add link t-dummy name t-dummy.100 type vlan id 100
$ ip link add name t-nlmon type nlmon
$ ip link set t-nlmon master team0
$ ip link set t-nlmon nomaster
$ ip link set t-dummy up
$ ip link set team0 up
$ ip link set t-dummy.100 down
$ ip link set t-dummy.100 master team0
When enslave a vlan device to team device and team device type is changed
from non-ether to ether, header_ops of team device is changed to
vlan_header_ops. That is incorrect and will trigger null-ptr-deref
for vlan->real_dev in vlan_dev_hard_header() because team device is not
a vlan device.
Cache eth_header_ops in team_setup(), then assign cached header_ops to
header_ops of team net device when its type is changed from non-ether
to ether to fix the bug.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1d76efe1577b",
"lessThan": "1779eb51b9cc",
"versionType": "git"
},
{
"status": "affected",
"version": "1d76efe1577b",
"lessThan": "a7fb47b97111",
"versionType": "git"
},
{
"status": "affected",
"version": "1d76efe1577b",
"lessThan": "c5f6478686bb",
"versionType": "git"
},
{
"status": "affected",
"version": "1d76efe1577b",
"lessThan": "b44dd92e2afd",
"versionType": "git"
},
{
"status": "affected",
"version": "1d76efe1577b",
"lessThan": "cd05eec2ee0c",
"versionType": "git"
},
{
"status": "affected",
"version": "1d76efe1577b",
"lessThan": "2f0acb0736ec",
"versionType": "git"
},
{
"status": "affected",
"version": "1d76efe1577b",
"lessThan": "cac50d9f5d87",
"versionType": "git"
},
{
"status": "affected",
"version": "1d76efe1577b",
"lessThan": "492032760127",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/team/team.c",
"include/linux/if_team.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.7",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "4.14.327",
"versionType": "custom",
"lessThanOrEqual": "4.14.*"
},
{
"status": "unaffected",
"version": "4.19.296",
"versionType": "custom",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.258",
"versionType": "custom",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.198",
"versionType": "custom",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.134",
"versionType": "custom",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.56",
"versionType": "custom",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.5.6",
"versionType": "custom",
"lessThanOrEqual": "6.5.*"
},
{
"status": "unaffected",
"version": "6.6",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/team/team.c",
"include/linux/if_team.h"
],
"defaultStatus": "affected"
}
]
git.kernel.org/stable/c/1779eb51b9cc628cee551f252701a85a2a50a457
git.kernel.org/stable/c/2f0acb0736ecc3eb85dc80ad2790d634dcb10b58
git.kernel.org/stable/c/492032760127251e5540a5716a70996bacf2a3fd
git.kernel.org/stable/c/a7fb47b9711101d2405b0eb1276fb1f9b9b270c7
git.kernel.org/stable/c/b44dd92e2afd89eb6e9d27616858e72a67bdc1a7
git.kernel.org/stable/c/c5f6478686bb45f453031594ae19b6c9723a780d
git.kernel.org/stable/c/cac50d9f5d876be32cb9aa21c74018468900284d
git.kernel.org/stable/c/cd05eec2ee0cc396813a32ef675634e403748255