181 lines
11 KiB
JSON
181 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64122",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T07:54:57.036Z",
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"datePublished": "2026-07-19T15:40:20.446Z",
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"dateUpdated": "2026-08-05T12:39:28.664Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:39:28.664Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"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 → 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c"
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],
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"versions": [
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{
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"version": "4329514c61abefe4961541b128c549b017bab5ad",
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"lessThan": "1604a2d68414aa4cc34faac0b7faa9c14455e8d3",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9",
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"lessThan": "152295aa7dc2c5e046606f7dadc84fce41136446",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "83ac0304a2d77519dae1e54c9713cbe1aedf19c9",
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"lessThan": "7d260c5d2d89eb2c8c528d54b576b3aae3e20231",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "63f9d5fb4d8040077df801ca3270e2f02d55e0d9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.18.14",
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"lessThan": "6.18.34",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.19.4",
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"lessThan": "6.20",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c"
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],
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"versions": [
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{
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"version": "7.0",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.0",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18.14",
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"versionEndExcluding": "6.18.34"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.0",
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"versionEndExcluding": "7.0.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.0",
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"versionEndExcluding": "7.1"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19.4"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/1604a2d68414aa4cc34faac0b7faa9c14455e8d3"
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},
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{
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"url": "https://git.kernel.org/stable/c/152295aa7dc2c5e046606f7dadc84fce41136446"
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},
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{
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"url": "https://git.kernel.org/stable/c/7d260c5d2d89eb2c8c528d54b576b3aae3e20231"
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}
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],
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"title": "net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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} |