CVE-2022-50004
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-50004
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50004.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-50004
- Downstream
- Published
- 2025-06-18T11:01:09Z
- Modified
- 2025-10-15T01:51:21.761984Z
- Summary
- xfrm: policy: fix metadata dst->dev xmit null pointer dereference
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
xfrm: policy: fix metadata dst->dev xmit null pointer dereference
When we try to transmit an skb with metadatadst attached (i.e. dst->dev == NULL) through xfrm interface we can hit a null pointer dereference[1] in xfrmixmit2() -> xfrmlookupwithifid() due to the check for a loopback skb device when there's no policy which dereferences dst->dev unconditionally. Not having dst->dev can be interepreted as it not being a loopback device, so just add a check for a null dstorig->dev.
With this fix xfrm interface's Tx error counters go up as usual.
[1] net-next calltrace captured via netconsole: BUG: kernel NULL pointer dereference, address: 00000000000000c0 #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 7231 Comm: ping Kdump: loaded Not tainted 5.19.0+ #24 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-1.fc36 04/01/2014 RIP: 0010:xfrmlookupwithifid+0x5eb/0xa60 Code: 8d 74 24 38 e8 26 a4 37 00 48 89 c1 e9 12 fc ff ff 49 63 ed 41 83 fd be 0f 85 be 01 00 00 41 be ff ff ff ff 45 31 ed 48 8b 03 <f6> 80 c0 00 00 00 08 75 0f 41 80 bc 24 19 0d 00 00 01 0f 84 1e 02 RSP: 0018:ffffb0db82c679f0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffd0db7fcad430 RCX: ffffb0db82c67a10 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb0db82c67a80 RBP: ffffb0db82c67a80 R08: ffffb0db82c67a14 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8fa449667dc8 R12: ffffffff966db880 R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000000 FS: 00007ff35c83f000(0000) GS:ffff8fa478480000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000c0 CR3: 000000001ebb7000 CR4: 0000000000350ee0 Call Trace: <TASK> xfrmixmit+0xde/0x460 ? tcfbpfact+0x13d/0x2a0 devhardstartxmit+0x72/0x1e0 _devqueuexmit+0x251/0xd30 ipfinishoutput2+0x140/0x550 ippushpendingframes+0x56/0x80 rawsendmsg+0x663/0x10a0 ? trychargememcg+0x3fd/0x7a0 ? _modmemcglruvecstate+0x93/0x110 ? socksendmsg+0x30/0x40 socksendmsg+0x30/0x40 _syssendto+0xeb/0x130 ? handlemmfault+0xae/0x280 ? douseraddrfault+0x1e7/0x680 ? kvmreadandresetapfflags+0x3b/0x50 _x64syssendto+0x20/0x30 dosyscall64+0x34/0x80 entrySYSCALL64afterhwframe+0x46/0xb0 RIP: 0033:0x7ff35cac1366 Code: eb 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 72 c3 90 55 48 83 ec 30 44 89 4c 24 2c 4c 89 RSP: 002b:00007fff738e4028 EFLAGS: 00000246 ORIGRAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fff738e57b0 RCX: 00007ff35cac1366 RDX: 0000000000000040 RSI: 0000557164e4b450 RDI: 0000000000000003 RBP: 0000557164e4b450 R08: 00007fff738e7a2c R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000040 R13: 00007fff738e5770 R14: 00007fff738e4030 R15: 0000001d00000001 </TASK> Modules linked in: netconsole veth brnetfilter bridge bonding virtio_net [last unloaded: netconsole] CR2: 00000000000000c0
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/17ecd4a4db4783392edd4944f5e8268205083f70
- https://git.kernel.org/stable/c/2761612bcde9776dd93ce60ce55ef0b7c7329153
- https://git.kernel.org/stable/c/96f2758a6d028d1ac08616de9c3c7ff2a122ecf1
- https://git.kernel.org/stable/c/e26d676c1f9f335510780b566a10475c47ce03d0
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5b7f84b1f9f46327360a64c529433fa0d68cc3f4Fixed2761612bcde9776dd93ce60ce55ef0b7c7329153
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2d151d39073aff498358543801fca0f670fea981Fixed96f2758a6d028d1ac08616de9c3c7ff2a122ecf1
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2d151d39073aff498358543801fca0f670fea981Fixede26d676c1f9f335510780b566a10475c47ce03d0
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2d151d39073aff498358543801fca0f670fea981Fixed17ecd4a4db4783392edd4944f5e8268205083f70
Affected versions
v5.*
Database specific
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"file": "net/xfrm/xfrm_policy.c"
},
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},
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"target": {
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"target": {
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