CVE-2021-47136

Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47136
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47136.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47136
Related
Published
2024-03-25T09:15:07Z
Modified
2024-09-18T01:00:20Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

net: zero-initialize tc skb extension on allocation

Function skbextadd() doesn't initialize created skb extension with any value and leaves it up to the user. However, since extension of type TCSKBEXT originally contained only single value tcskbext->chain its users used to just assign the chain value without setting whole extension memory to zero first. This assumption changed when TCSKBEXT extension was extended with additional fields but not all users were updated to initialize the new fields which leads to use of uninitialized memory afterwards. UBSAN log:

[ 778.299821] UBSAN: invalid-load in net/openvswitch/flow.c:899:28 [ 778.301495] load of value 107 is not a valid value for type 'Bool' [ 778.303215] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc7+ #2 [ 778.304933] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 778.307901] Call Trace: [ 778.308680] <IRQ> [ 778.309358] dumpstack+0xbb/0x107 [ 778.310307] ubsanepilogue+0x5/0x40 [ 778.311167] _ubsanhandleloadinvalidvalue.cold+0x43/0x48 [ 778.312454] ? memset+0x20/0x40 [ 778.313230] ovsflowkeyextract.cold+0xf/0x14 [openvswitch] [ 778.314532] ovsvportreceive+0x19e/0x2e0 [openvswitch] [ 778.315749] ? ovsvportfindupcallportid+0x330/0x330 [openvswitch] [ 778.317188] ? createprofcpumask+0x20/0x20 [ 778.318220] ? archstackwalk+0x82/0xf0 [ 778.319153] ? secondarystartup64noverify+0xb0/0xbb [ 778.320399] ? stacktracesave+0x91/0xc0 [ 778.321362] ? stacktraceconsumeentry+0x160/0x160 [ 778.322517] ? lockrelease+0x52e/0x760 [ 778.323444] netdevframehook+0x323/0x610 [openvswitch] [ 778.324668] ? ovsnetdevgetvport+0xe0/0xe0 [openvswitch] [ 778.325950] _netifreceiveskbcore+0x771/0x2db0 [ 778.327067] ? lockdowngrade+0x6e0/0x6f0 [ 778.328021] ? lockacquire+0x565/0x720 [ 778.328940] ? genericxdptx+0x4f0/0x4f0 [ 778.329902] ? inetgroreceive+0x2a7/0x10a0 [ 778.330914] ? lockdowngrade+0x6f0/0x6f0 [ 778.331867] ? udp4groreceive+0x4c4/0x13e0 [ 778.332876] ? lockrelease+0x52e/0x760 [ 778.333808] ? devgroreceive+0xcc8/0x2380 [ 778.334810] ? lockdowngrade+0x6f0/0x6f0 [ 778.335769] _netifreceiveskblistcore+0x295/0x820 [ 778.336955] ? processbacklog+0x780/0x780 [ 778.337941] ? mlx5ereptcnetdeviceeventunregister+0x20/0x20 [mlx5core] [ 778.339613] ? seqcountlockdepreaderaccess.constprop.0+0xa7/0xc0 [ 778.341033] ? kvmclockgetcycles+0x14/0x20 [ 778.342072] netifreceiveskblistinternal+0x5f5/0xcb0 [ 778.343288] ? _kasankmalloc+0x7a/0x90 [ 778.344234] ? mlx5ehandlerxcqempwrq+0x9e0/0x9e0 [mlx5core] [ 778.345676] ? mlx5exmitxdpframempwqe+0x14d0/0x14d0 [mlx5core] [ 778.347140] ? _netifreceiveskblistcore+0x820/0x820 [ 778.348351] ? mlx5epostrxmpwqes+0xa6/0x25d0 [mlx5core] [ 778.349688] ? napigroflush+0x26c/0x3c0 [ 778.350641] napicompletedone+0x188/0x6b0 [ 778.351627] mlx5enapipoll+0x373/0x1b80 [mlx5core] [ 778.352853] _napipoll+0x9f/0x510 [ 778.353704] ? mlx5flownamespacesetmode+0x260/0x260 [mlx5core] [ 778.355158] netrxaction+0x34c/0xa40 [ 778.356060] ? napithreadedpoll+0x3d0/0x3d0 [ 778.357083] ? schedclockcpu+0x18/0x190 [ 778.358041] ? _commoninterrupt+0x8e/0x1a0 [ 778.359045] _dosoftirq+0x1ce/0x984 [ 778.359938] _irqexitrcu+0x137/0x1d0 [ 778.360865] irqexitrcu+0xa/0x20 [ 778.361708] commoninterrupt+0x80/0xa0 [ 778.362640] </IRQ> [ 778.363212] asmcommoninterrupt+0x1e/0x40 [ 778.364204] RIP: 0010:nativesafe_halt+0xe/0x10 [ 778.365273] Code: 4f ff ff ff 4c 89 e7 e8 50 3f 40 fe e9 dc fe ff ff 48 89 df e8 43 3f 40 fe eb 90 cc e9 07 00 00 00 0f 00 2d 74 05 62 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 64 05 62 00 f4 c3 cc cc 0f 1f 44 00 [ 778.369355] RSP: 0018:ffffffff84407e48 EFLAGS: 00000246 [ 778.370570] RAX ---truncated---

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.46-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.14.6-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.14.6-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}