CVE-2024-44946

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-44946
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-44946.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-44946
Related
Published
2024-08-31T14:15:04Z
Modified
2024-10-07T19:47:39.735253Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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

kcm: Serialise kcm_sendmsg() for the same socket.

syzkaller reported UAF in kcm_release(). [0]

The scenario is

  1. Thread A builds a skb with MSGMORE and sets kcm->seqskb.

  2. Thread A resumes building skb from kcm->seqskb but is blocked by skstreamwaitmemory()

  3. Thread B calls sendmsg() concurrently, finishes building kcm->seq_skb and puts the skb to the write queue

  4. Thread A faces an error and finally frees skb that is already in the write queue

  5. kcm_release() does double-free the skb in the write queue

When a thread is building a MSG_MORE skb, another thread must not touch it.

Let's add a per-sk mutex and serialise kcm_sendmsg().

BUG: KASAN: slab-use-after-free in _skbdequeue include/linux/skbuff.h:2385 [inline] BUG: KASAN: slab-use-after-free in _skbqueuepurgereason include/linux/skbuff.h:3175 [inline] BUG: KASAN: slab-use-after-free in _skbqueuepurge include/linux/skbuff.h:3181 [inline] BUG: KASAN: slab-use-after-free in kcmrelease+0x170/0x4c8 net/kcm/kcmsock.c:1691 Read of size 8 at addr ffff0000ced0fc80 by task syz-executor329/6167

CPU: 1 PID: 6167 Comm: syz-executor329 Tainted: G B 6.8.0-rc5-syzkaller-g9abbc24128bc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call trace: dumpbacktrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 showstack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 dumpstack lib/dumpstack.c:88 [inline] dumpstacklvl+0xd0/0x124 lib/dumpstack.c:106 printaddressdescription mm/kasan/report.c:377 [inline] printreport+0x178/0x518 mm/kasan/report.c:488 kasanreport+0xd8/0x138 mm/kasan/report.c:601 _asanreportload8noabort+0x20/0x2c mm/kasan/reportgeneric.c:381 _skbunlink include/linux/skbuff.h:2366 [inline] _skbdequeue include/linux/skbuff.h:2385 [inline] _skbqueuepurgereason include/linux/skbuff.h:3175 [inline] _skbqueuepurge include/linux/skbuff.h:3181 [inline] kcmrelease+0x170/0x4c8 net/kcm/kcmsock.c:1691 _sockrelease net/socket.c:659 [inline] sockclose+0xa4/0x1e8 net/socket.c:1421 _fput+0x30c/0x738 fs/filetable.c:376 _fput+0x20/0x30 fs/filetable.c:404 taskworkrun+0x230/0x2e0 kernel/taskwork.c:180 exittaskwork include/linux/taskwork.h:38 [inline] doexit+0x618/0x1f64 kernel/exit.c:871 dogroupexit+0x194/0x22c kernel/exit.c:1020 getsignal+0x1500/0x15ec kernel/signal.c:2893 dosignal+0x23c/0x3b44 arch/arm64/kernel/signal.c:1249 donotifyresume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 exittousermodeprepare arch/arm64/kernel/entry-common.c:169 [inline] exittousermode arch/arm64/kernel/entry-common.c:178 [inline] el0svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713 el0t64synchandler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Allocated by task 6166: kasansavestack mm/kasan/common.c:47 [inline] kasansavetrack+0x40/0x78 mm/kasan/common.c:68 kasansaveallocinfo+0x70/0x84 mm/kasan/generic.c:626 unpoisonslabobject mm/kasan/common.c:314 [inline] _kasanslaballoc+0x74/0x8c mm/kasan/common.c:340 kasanslaballoc include/linux/kasan.h:201 [inline] slabpostallochook mm/slub.c:3813 [inline] slaballocnode mm/slub.c:3860 [inline] kmemcacheallocnode+0x204/0x4c0 mm/slub.c:3903 _allocskb+0x19c/0x3d8 net/core/skbuff.c:641 allocskb include/linux/skbuff.h:1296 [inline] kcmsendmsg+0x1d3c/0x2124 net/kcm/kcmsock.c:783 socksendmsgnosec net/socket.c:730 [inline] _socksendmsg net/socket.c:745 [inline] socksendmsg+0x220/0x2c0 net/socket.c:768 splicetosocket+0x7cc/0xd58 fs/splice.c:889 dosplicefrom fs/splice.c:941 [inline] directspliceactor+0xec/0x1d8 fs/splice.c:1164 splicedirecttoactor+0x438/0xa0c fs/splice.c:1108 dosplicedirect_actor ---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
5.10.226-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1
5.10.84-1
5.10.92-1~bpo10+1
5.10.92-1
5.10.92-2
5.10.103-1~bpo10+1
5.10.103-1
5.10.106-1
5.10.113-1
5.10.120-1~bpo10+1
5.10.120-1
5.10.127-1
5.10.127-2~bpo10+1
5.10.127-2
5.10.136-1
5.10.140-1
5.10.148-1
5.10.149-1
5.10.149-2
5.10.158-1
5.10.158-2
5.10.162-1
5.10.178-1
5.10.178-2
5.10.178-3
5.10.179-1
5.10.179-2
5.10.179-3
5.10.179-4
5.10.179-5
5.10.191-1
5.10.197-1
5.10.205-1
5.10.205-2
5.10.209-1
5.10.209-2
5.10.216-1
5.10.218-1
5.10.221-1
5.10.223-1

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
6.1.112-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3

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
6.10.7-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3
6.1.112-1
6.3.1-1~exp1
6.3.2-1~exp1
6.3.4-1~exp1
6.3.5-1~exp1
6.3.7-1~bpo12+1
6.3.7-1
6.3.11-1
6.4~rc6-1~exp1
6.4~rc7-1~exp1
6.4.1-1~exp1
6.4.4-1~bpo12+1
6.4.4-1
6.4.4-2
6.4.4-3~bpo12+1
6.4.4-3
6.4.11-1
6.4.13-1
6.5~rc4-1~exp1
6.5~rc6-1~exp1
6.5~rc7-1~exp1
6.5.1-1~exp1
6.5.3-1~bpo12+1
6.5.3-1
6.5.6-1
6.5.8-1
6.5.10-1~bpo12+1
6.5.10-1
6.5.13-1
6.6.3-1~exp1
6.6.4-1~exp1
6.6.7-1~exp1
6.6.8-1
6.6.9-1
6.6.11-1
6.6.13-1~bpo12+1
6.6.13-1
6.6.15-1
6.6.15-2
6.7-1~exp1
6.7.1-1~exp1
6.7.4-1~exp1
6.7.7-1
6.7.9-1
6.7.9-2
6.7.12-1~bpo12+1
6.7.12-1
6.8.9-1
6.8.11-1
6.8.12-1~bpo12+1
6.8.12-1
6.9.2-1~exp1
6.9.7-1~bpo12+1
6.9.7-1
6.9.8-1
6.9.9-1
6.9.10-1~bpo12+1
6.9.10-1
6.9.11-1
6.9.12-1
6.10-1~exp1
6.10.1-1~exp1
6.10.3-1
6.10.4-1
6.10.6-1~bpo12+1
6.10.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}