CVE-2026-64122

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64122", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.036Z", "datePublished": "2026-07-19T15:40:20.446Z", "dateUpdated": "2026-08-05T12:39:28.664Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:28.664Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover\n\nmlx5e_tx_reporter_timeout_recover() accesses sq->netdev after\nmlx5e_safe_reopen_channels() has torn down and freed the channel (and\nits embedded SQs). Replace the three sq->netdev references with\npriv->netdev which is safe because priv outlives channel teardown.\n\nThe netdev_err() call already used priv->netdev for this reason; make\nthe trylock/unlock and health_channel_eq_recover calls consistent.\n\nThis fixes the following KASAN splat:\n\n BUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\n Read of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277\n\n Call Trace:\n mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\n devlink_health_reporter_recover+0xa2/0x150\n devlink_health_report+0x254/0x7c0\n mlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core]\n mlx5e_tx_timeout_work+0x109/0x170 [mlx5_core]\n process_one_work+0x677/0xf20\n worker_thread+0x51f/0xd90\n kthread+0x3a5/0x810\n ret_from_fork+0x208/0x400\n ret_from_fork_asm+0x1a/0x30"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is reached from the mlx5e netdev TX-timeout watchdog recovery path on Mellanox ConnectX NICs deployed on internet-facing cloud/datacenter servers; remote peers generate outbound traffic that can stall TX queues and fire `ndo_tx_timeout`, leading to `mlx5e_tx_reporter_timeout_recover()` without any local syscall.\nAC:L - Once a TX timeout occurs, recovery is deterministic: `mlx5e_health_channel_eq_recover()` typically fails when no EQEs are pending, `mlx5e_safe_reopen_channels()` frees the embedded SQ, and the stale `sq->netdev` dereference in `netdev_unlock()` always follows on that fallback path rather than requiring a race the attacker cannot influence.\nPR:N - No capability checks or authentication gates exist on the TX-timeout \u2192 devlink health auto-recover call chain; an unauthenticated remote attacker who can send traffic to a host mlx5 interface can induce the watchdog/recovery sequence without root, CAP_NET_ADMIN, or user-namespace privileges.\nUI:N - Exploitation requires no victim user action such as mounting a filesystem or opening a file; it is triggered automatically by the kernel netdev watchdog and workqueue recovery once TX queues stall.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same host kernel security authority; this is not a VM-guest-to-host escape, IOMMU bypass, or other cross-boundary scenario.\nC:H - The KASAN splat confirms an 8-byte use-after-free read of `sq->netdev` from freed channel/SQ memory; UAF on this structure pointer can be leveraged for arbitrary kernel memory disclosure via heap reuse and controlled reads through the corrupted `net_device` reference.\nI:H - The UAF supplies a controlled `struct net_device *` to `netdev_unlock()`, which performs `mutex_unlock()` on attacker-influenced freed memory, enabling heap spraying and memory corruption primitives that can be developed into arbitrary kernel write or code execution.\nA:H - Use-after-free in kernel TX recovery provably causes KASAN faults and can panic or oops the host during `netdev_unlock()` on freed SQ memory, producing complete loss of kernel availability on affected mlx5 systems."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c"], "versions": [{"version": "4329514c61abefe4961541b128c549b017bab5ad", "lessThan": "1604a2d68414aa4cc34faac0b7faa9c14455e8d3", "status": "affected", "versionType": "git"}, {"version": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9", "lessThan": "152295aa7dc2c5e046606f7dadc84fce41136446", "status": "affected", "versionType": "git"}, {"version": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9", "lessThan": "7d260c5d2d89eb2c8c528d54b576b3aae3e20231", "status": "affected", "versionType": "git"}, {"version": "63f9d5fb4d8040077df801ca3270e2f02d55e0d9", "status": "affected", "versionType": "git"}, {"version": "6.18.14", "lessThan": "6.18.34", "status": "affected", "versionType": "semver"}, {"version": "6.19.4", "lessThan": "6.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.14", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1604a2d68414aa4cc34faac0b7faa9c14455e8d3"}, {"url": "https://git.kernel.org/stable/c/152295aa7dc2c5e046606f7dadc84fce41136446"}, {"url": "https://git.kernel.org/stable/c/7d260c5d2d89eb2c8c528d54b576b3aae3e20231"}], "title": "net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1604a2d68414aa4cc34faac0b7faa9c14455e8d3", "status": "affected", "version": "4329514c61abefe4961541b128c549b017bab5ad", "versionType": "git"}, {"lessThan": "152295aa7dc2c5e046606f7dadc84fce41136446", "status": "affected", "version": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9", "versionType": "git"}, {"lessThan": "7d260c5d2d89eb2c8c528d54b576b3aae3e20231", "status": "affected", "version": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9", "versionType": "git"}, {"status": "affected", "version": "63f9d5fb4d8040077df801ca3270e2f02d55e0d9", "versionType": "git"}, {"lessThan": "6.18.34", "status": "affected", "version": "6.18.14", "versionType": "semver"}, {"lessThan": "6.20", "status": "affected", "version": "6.19.4", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.34", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FE4C1641-E263-422B-BEAD-A3B6E40DB5EC", "versionEndExcluding": "6.18.34", "versionStartIncluding": "6.18.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "08225BCD-840E-490B-A961-B7200E94D5AF", "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.19.4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover\n\nmlx5e_tx_reporter_timeout_recover() accesses sq->netdev after\nmlx5e_safe_reopen_channels() has torn down and freed the channel (and\nits embedded SQs). Replace the three sq->netdev references with\npriv->netdev which is safe because priv outlives channel teardown.\n\nThe netdev_err() call already used priv->netdev for this reason; make\nthe trylock/unlock and health_channel_eq_recover calls consistent.\n\nThis fixes the following KASAN splat:\n\n BUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\n Read of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277\n\n Call Trace:\n mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\n devlink_health_reporter_recover+0xa2/0x150\n devlink_health_report+0x254/0x7c0\n mlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core]\n mlx5e_tx_timeout_work+0x109/0x170 [mlx5_core]\n process_one_work+0x677/0xf20\n worker_thread+0x51f/0xd90\n kthread+0x3a5/0x810\n ret_from_fork+0x208/0x400\n ret_from_fork_asm+0x1a/0x30"}], "id": "CVE-2026-64122", "lastModified": "2026-08-13T15:11:37.460", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:53.790", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/152295aa7dc2c5e046606f7dadc84fce41136446"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1604a2d68414aa4cc34faac0b7faa9c14455e8d3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d260c5d2d89eb2c8c528d54b576b3aae3e20231"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover", "id": "2502526", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502526"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover\nmlx5e_tx_reporter_timeout_recover() accesses sq->netdev after\nmlx5e_safe_reopen_channels() has torn down and freed the channel (and\nits embedded SQs). Replace the three sq->netdev references with\npriv->netdev which is safe because priv outlives channel teardown.\nThe netdev_err() call already used priv->netdev for this reason; make\nthe trylock/unlock and health_channel_eq_recover calls consistent.\nThis fixes the following KASAN splat:\nBUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\nRead of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277\nCall Trace:\nmlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]\ndevlink_health_reporter_recover+0xa2/0x150\ndevlink_health_report+0x254/0x7c0\nmlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core]\nmlx5e_tx_timeout_work+0x109/0x170 [mlx5_core]\nprocess_one_work+0x677/0xf20\nworker_thread+0x51f/0xd90\nkthread+0x3a5/0x810\nret_from_fork+0x208/0x400\nret_from_fork_asm+0x1a/0x30", "A flaw was found in the Linux kernel's mlx5e network driver. The mlx5e_tx_reporter_timeout_recover function attempts to access network device resources after they have been deallocated, leading to a use-after-free vulnerability. This could allow a local attacker to cause a denial of service (system crash) or potentially escalate privileges."], "name": "CVE-2026-64122", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64122\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64122\nhttps://lore.kernel.org/linux-cve-announce/2026071925-CVE-2026-64122-3ed2@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4329514c61abefe4961541b128c549b017bab5ad,1604a2d68414aa4cc34faac0b7faa9c14455e8d3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[83ac0304a2d77519dae1e54c9713cbe1aedf19c9,152295aa7dc2c5e046606f7dadc84fce41136446)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[83ac0304a2d77519dae1e54c9713cbe1aedf19c9,7d260c5d2d89eb2c8c528d54b576b3aae3e20231)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "63f9d5fb4d8040077df801ca3270e2f02d55e0d9"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.14,6.18.34)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.19.4,6.20)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.34,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.11,7.0.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T10:30:04.755144+00:00", "updated": "2026-08-13T18:30:16.257172+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}