{"id":"CVE-2022-49649","state":"PUBLISHED","title":"xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue\n\nxenvif_rx_next_skb() is expecting the rx queue not being empty, but\nin case the loop in xenvif_rx_action() is doing multiple iterations,\nthe availability of another skb in the rx queue is not being checked.\n\nThis can lead to crashes:\n\n[40072.537261] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080\n[40072.537407] IP: xenvif_rx_skb+0x23/0x590 [xen_netback]\n[40072.537534] PGD 0 P4D 0\n[40072.537644] Oops: 0000 [#1] SMP NOPTI\n[40072.537749] CPU: 0 PID: 12505 Comm: v1-c40247-q2-gu Not tainted 4.12.14-122.121-default #1 SLE12-SP5\n[40072.537867] Hardware name: HP ProLiant DL580 Gen9/ProLiant DL580 Gen9, BIOS U17 11/23/2021\n[40072.537999] task: ffff880433b38100 task.stack: ffffc90043d40000\n[40072.538112] RIP: e030:xenvif_rx_skb+0x23/0x590 [xen_netback]\n[40072.538217] RSP: e02b:ffffc90043d43de0 EFLAGS: 00010246\n[40072.538319] RAX: 0000000000000000 RBX: ffffc90043cd7cd0 RCX: 00000000000000f7\n[40072.538430] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffc90043d43df8\n[40072.538531] RBP: 000000000000003f R08: 000077ff80000000 R09: 0000000000000008\n[40072.538644] R10: 0000000000007ff0 R11: 00000000000008f6 R12: ffffc90043ce2708\n[40072.538745] R13: 0000000000000000 R14: ffffc90043d43ed0 R15: ffff88043ea748c0\n[40072.538861] FS: 0000000000000000(0000) GS:ffff880484600000(0000) knlGS:0000000000000000\n[40072.538988] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033\n[40072.539088] CR2: 0000000000000080 CR3: 0000000407ac8000 CR4: 0000000000040660\n[40072.539211] Call Trace:\n[40072.539319] xenvif_rx_action+0x71/0x90 [xen_netback]\n[40072.539429] xenvif_kthread_guest_rx+0x14a/0x29c [xen_netback]\n\nFix that by stopping the loop in case the rx queue becomes empty.","publishedAt":"2025-02-26T02:23:52.531Z","updatedAt":"2026-05-11T19:04:01.385Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"c0fcceb5f3f1ec197c014fe218c2f28108cacd27","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"d5320c6a27aa975aff740f9cb481dcbde48f4348","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"5a071aefd6414af5a20321ab58a0557b81993687","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"7425479d20f9e96f7c3ec8e8a93fe0d7478724cb","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"b9c32a6886af79d6e0ad87a7b01800ed079cdd02","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"b99174ac57fe5d8867448c03b23828e63f24cb1c","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"f0b5c819b062df8bf5f2acf4697e3871cb3722da","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"94e8100678889ab428e68acadf042de723f094b9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netback/rx.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"4.9.324","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.289","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.253","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.207","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.132","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.56","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.18.13","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netback/rx.c"]}],"references":["https://git.kernel.org/stable/c/c0fcceb5f3f1ec197c014fe218c2f28108cacd27","https://git.kernel.org/stable/c/d5320c6a27aa975aff740f9cb481dcbde48f4348","https://git.kernel.org/stable/c/5a071aefd6414af5a20321ab58a0557b81993687","https://git.kernel.org/stable/c/7425479d20f9e96f7c3ec8e8a93fe0d7478724cb","https://git.kernel.org/stable/c/b9c32a6886af79d6e0ad87a7b01800ed079cdd02","https://git.kernel.org/stable/c/b99174ac57fe5d8867448c03b23828e63f24cb1c","https://git.kernel.org/stable/c/f0b5c819b062df8bf5f2acf4697e3871cb3722da","https://git.kernel.org/stable/c/94e8100678889ab428e68acadf042de723f094b9"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49649.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49649","state":"PUBLISHED","datePublished":"2025-02-26T02:23:52.531Z","dateUpdated":"2026-05-11T19:04:01.385Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T02:21:30.433Z"},"containers":{"cna":{"title":"xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue\n\nxenvif_rx_next_skb() is expecting the rx queue not being empty, but\nin case the loop in xenvif_rx_action() is doing multiple iterations,\nthe availability of another skb in the rx queue is not being checked.\n\nThis can lead to crashes:\n\n[40072.537261] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080\n[40072.537407] IP: xenvif_rx_skb+0x23/0x590 [xen_netback]\n[40072.537534] PGD 0 P4D 0\n[40072.537644] Oops: 0000 [#1] SMP NOPTI\n[40072.537749] CPU: 0 PID: 12505 Comm: v1-c40247-q2-gu Not tainted 4.12.14-122.121-default #1 SLE12-SP5\n[40072.537867] Hardware name: HP ProLiant DL580 Gen9/ProLiant DL580 Gen9, BIOS U17 11/23/2021\n[40072.537999] task: ffff880433b38100 task.stack: ffffc90043d40000\n[40072.538112] RIP: e030:xenvif_rx_skb+0x23/0x590 [xen_netback]\n[40072.538217] RSP: e02b:ffffc90043d43de0 EFLAGS: 00010246\n[40072.538319] RAX: 0000000000000000 RBX: ffffc90043cd7cd0 RCX: 00000000000000f7\n[40072.538430] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffc90043d43df8\n[40072.538531] RBP: 000000000000003f R08: 000077ff80000000 R09: 0000000000000008\n[40072.538644] R10: 0000000000007ff0 R11: 00000000000008f6 R12: ffffc90043ce2708\n[40072.538745] R13: 0000000000000000 R14: ffffc90043d43ed0 R15: ffff88043ea748c0\n[40072.538861] FS: 0000000000000000(0000) GS:ffff880484600000(0000) knlGS:0000000000000000\n[40072.538988] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033\n[40072.539088] CR2: 0000000000000080 CR3: 0000000407ac8000 CR4: 0000000000040660\n[40072.539211] Call Trace:\n[40072.539319] xenvif_rx_action+0x71/0x90 [xen_netback]\n[40072.539429] xenvif_kthread_guest_rx+0x14a/0x29c [xen_netback]\n\nFix that by stopping the loop in case the rx queue becomes empty."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"c0fcceb5f3f1ec197c014fe218c2f28108cacd27","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"d5320c6a27aa975aff740f9cb481dcbde48f4348","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"5a071aefd6414af5a20321ab58a0557b81993687","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"7425479d20f9e96f7c3ec8e8a93fe0d7478724cb","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"b9c32a6886af79d6e0ad87a7b01800ed079cdd02","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"b99174ac57fe5d8867448c03b23828e63f24cb1c","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"f0b5c819b062df8bf5f2acf4697e3871cb3722da","versionType":"git"},{"version":"98f6d57ced73b723551568262019f1d6c8771f20","status":"affected","lessThan":"94e8100678889ab428e68acadf042de723f094b9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netback/rx.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"4.9.324","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.289","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.253","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.207","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.132","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.56","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.18.13","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netback/rx.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c0fcceb5f3f1ec197c014fe218c2f28108cacd27"},{"url":"https://git.kernel.org/stable/c/d5320c6a27aa975aff740f9cb481dcbde48f4348"},{"url":"https://git.kernel.org/stable/c/5a071aefd6414af5a20321ab58a0557b81993687"},{"url":"https://git.kernel.org/stable/c/7425479d20f9e96f7c3ec8e8a93fe0d7478724cb"},{"url":"https://git.kernel.org/stable/c/b9c32a6886af79d6e0ad87a7b01800ed079cdd02"},{"url":"https://git.kernel.org/stable/c/b99174ac57fe5d8867448c03b23828e63f24cb1c"},{"url":"https://git.kernel.org/stable/c/f0b5c819b062df8bf5f2acf4697e3871cb3722da"},{"url":"https://git.kernel.org/stable/c/94e8100678889ab428e68acadf042de723f094b9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:04:01.385Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"4.9.324"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"4.14.289"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"4.19.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.4.207"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.10.132"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.15.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.18.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2022-49649","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:33:44.927179Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T19:36:48.488Z"}}]}}}