{"timestamp":"2024-09-10T16:25:28.698724Z","id":"CVE-2022-48862","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["drivers/vhost/iotlb.c","drivers/vhost/vhost.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","lessThan":"f8d88e86e90ea1002226d7ac2430152bfea003d1","versionType":"git","status":"affected"},{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","lessThan":"d9a747e6b6561280bf1791bb24c5e9e082193dad","versionType":"git","status":"affected"},{"version":"0bbe30668d89ec8a309f28ced6d092c90fb23e8c","lessThan":"e2ae38cf3d91837a493cb2093c87700ff3cbe667","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["drivers/vhost/iotlb.c","drivers/vhost/vhost.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"5.7","status":"affected"},{"version":"0","lessThan":"5.7","versionType":"semver","status":"unaffected"},{"version":"5.15.29","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"5.16.15","lessThanOrEqual":"5.16.*","versionType":"semver","status":"unaffected"},{"version":"5.17","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]

https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad

https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667

https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1

NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NIST CWE-835

OR
     *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.7 up to (excluding) 5.15.29
     *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 5.16.15

https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad No Types Assigned

https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad Patch

https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667 No Types Assigned

https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667 Patch

https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1 No Types Assigned

https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1 Patch

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

vhost: fix hung thread due to erroneous iotlb entries

In vhost_iotlb_add_range_ctx(), range size can overflow to 0 when
start is 0 and last is ULONG_MAX. One instance where it can happen
is when userspace sends an IOTLB message with iova=size=uaddr=0
(vhost_process_iotlb_msg). So, an entry with size = 0, start = 0,
last = ULONG_MAX ends up in the iotlb. Next time a packet is sent,
iotlb_access_ok() loops indefinitely due to that erroneous entry.

	Call Trace:
	 <TASK>
	 iotlb_access_ok+0x21b/0x3e0 drivers/vhost/vhost.c:1340
	 vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366
	 vhost_transport_do_send_pkt+0xe0/0xfd0 drivers/vhost/vsock.c:104
	 vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372
	 kthread+0x2e9/0x3a0 kernel/kthread.c:377
	 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
	 </TASK>

Reported by syzbot at:
	https://syzkaller.appspot.com/bug?extid=0abd373e2e50d704db87

To fix this, do two things:

1. Return -EINVAL in vhost_chr_write_iter() when userspace asks to map
   a range with size 0.
2. Fix vhost_iotlb_add_range_ctx() to handle the range [0, ULONG_MAX]
   by splitting it into two entries.

kernel.org https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dad [No types assigned]

kernel.org https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667 [No types assigned]

kernel.org https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1 [No types assigned]