CVE-2022-49649
xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue xenvif_rx_next_skb() is expecting the rx queue not being empty, but in case the loop in xenvif_rx_action() is doing multiple iterations, the availability of another skb in the rx queue is not being checked. This can lead to crashes: [40072.537261] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [40072.537407] IP: xenvif_rx_skb+0x23/0x590 [xen_netback] [40072.537534] PGD 0 P4D 0 [40072.537644] Oops: 0000 [#1] SMP NOPTI [40072.537749] CPU: 0 PID: 12505 Comm: v1-c40247-q2-gu Not tainted 4.12.14-122.121-default #1 SLE12-SP5 [40072.537867] Hardware name: HP ProLiant DL580 Gen9/ProLiant DL580 Gen9, BIOS U17 11/23/2021 [40072.537999] task: ffff880433b38100 task.stack: ffffc90043d40000 [40072.538112] RIP: e030:xenvif_rx_skb+0x23/0x590 [xen_netback] [40072.538217] RSP: e02b:ffffc90043d43de0 EFLAGS: 00010246 [40072.538319] RAX: 0000000000000000 RBX: ffffc90043cd7cd0 RCX: 00000000000000f7 [40072.538430] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffc90043d43df8 [40072.538531] RBP: 000000000000003f R08: 000077ff80000000 R09: 0000000000000008 [40072.538644] R10: 0000000000007ff0 R11: 00000000000008f6 R12: ffffc90043ce2708 [40072.538745] R13: 0000000000000000 R14: ffffc90043d43ed0 R15: ffff88043ea748c0 [40072.538861] FS: 0000000000000000(0000) GS:ffff880484600000(0000) knlGS:0000000000000000 [40072.538988] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 [40072.539088] CR2: 0000000000000080 CR3: 0000000407ac8000 CR4: 0000000000040660 [40072.539211] Call Trace: [40072.539319] xenvif_rx_action+0x71/0x90 [xen_netback] [40072.539429] xenvif_kthread_guest_rx+0x14a/0x29c [xen_netback] Fix that by stopping the loop in case the rx queue becomes empty.
Timeline
ID reserved
By Linux
Published
- 15 months later
· 15 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.27% · top 81% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 98f6d57ced73b723551568262019f1d6c8771f20 – < c0fcceb5f3f1ec197c014fe218c2f28108cacd27
- affected 98f6d57ced73b723551568262019f1d6c8771f20 – < d5320c6a27aa975aff740f9cb481dcbde48f4348
- affected 98f6d57ced73b723551568262019f1d6c8771f20 – < 5a071aefd6414af5a20321ab58a0557b81993687
- affected 98f6d57ced73b723551568262019f1d6c8771f20 – < 7425479d20f9e96f7c3ec8e8a93fe0d7478724cb
- affected 98f6d57ced73b723551568262019f1d6c8771f20 – < b9c32a6886af79d6e0ad87a7b01800ed079cdd02
- affected 98f6d57ced73b723551568262019f1d6c8771f20 – < b99174ac57fe5d8867448c03b23828e63f24cb1c
- affected 98f6d57ced73b723551568262019f1d6c8771f20 – < f0b5c819b062df8bf5f2acf4697e3871cb3722da
- affected 98f6d57ced73b723551568262019f1d6c8771f20 – < 94e8100678889ab428e68acadf042de723f094b9
- affected 4.9
- unaffected < 4.9
- unaffected 4.9.324 – ≤ 4.9.*
- unaffected 4.14.289 – ≤ 4.14.*
- unaffected 4.19.253 – ≤ 4.19.*
- unaffected 5.4.207 – ≤ 5.4.*
- unaffected 5.10.132 – ≤ 5.10.*
- unaffected 5.15.56 – ≤ 5.15.*
- unaffected 5.18.13 – ≤ 5.18.*
- unaffected 5.19 – ≤ *
References (8)
- https://git.kernel.org/stable/c/c0fcceb5f3f1ec197c014fe218c2f28108cacd27 (opens in a new tab)
- https://git.kernel.org/stable/c/d5320c6a27aa975aff740f9cb481dcbde48f4348 (opens in a new tab)
- https://git.kernel.org/stable/c/5a071aefd6414af5a20321ab58a0557b81993687 (opens in a new tab)
- https://git.kernel.org/stable/c/7425479d20f9e96f7c3ec8e8a93fe0d7478724cb (opens in a new tab)
- https://git.kernel.org/stable/c/b9c32a6886af79d6e0ad87a7b01800ed079cdd02 (opens in a new tab)
- https://git.kernel.org/stable/c/b99174ac57fe5d8867448c03b23828e63f24cb1c (opens in a new tab)
- https://git.kernel.org/stable/c/f0b5c819b062df8bf5f2acf4697e3871cb3722da (opens in a new tab)
- https://git.kernel.org/stable/c/94e8100678889ab428e68acadf042de723f094b9 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49649)Record last updated .