122 lines
6.3 KiB
JSON
122 lines
6.3 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-2026-89809",
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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": "2026-09-11T19:38:34.767Z",
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"datePublished": "2026-09-16T10:30:42.445Z",
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"dateUpdated": "2026-10-19T08:53:03.694Z"
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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": "2026-10-19T08:53:03.694Z"
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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\ndrm/amdkfd: fix scope of mqd_mgr dereference in pqm_debugfs_mqds\n\nReading /sys/kernel/debug/kfd/mqds while a process holds an active KFD\nqueue triggers a NULL pointer dereference because the for loop that\ncalls mqd_mgr->debugfs_show_mqd() is incorrectly placed outside the\nif (pqn->q) block that initializes mqd_mgr.\n\nThe queue list can contain entries where pqn->q is NULL (kernel queues\nwhere only pqn->kq is valid). In the original code:\n\n if (pqn->q) {\n ...\n mqd_mgr = q->device->dqm->mqd_mgrs[mqd_type];\n size = mqd_mgr->mqd_stride(...);\n }\n\n for (xcc = 0; xcc < num_xccs; xcc++) { // WRONG: outside if block\n mqd = q->mqd + size * xcc;\n r = mqd_mgr->debugfs_show_mqd(m, mqd);\n }\n\nWhen iterating over a queue node where pqn->q is NULL:\n1. The if (pqn->q) block is skipped\n2. mqd_mgr remains uninitialized (NULL from declaration)\n3. The for loop executes anyway\n4. mqd_mgr->debugfs_show_mqd(m, mqd) dereferences NULL\n\nThe crash manifests as:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor instruction fetch in kernel mode\n RIP: 0010:0x0\n Call Trace:\n pqm_debugfs_mqds+0x10c/0x1d0 [amdgpu]\n kfd_debugfs_mqds_by_process+0x9b/0x110 [amdgpu]\n seq_read_iter+0x132/0x4b0\n ...\n\nFix by moving the for loop inside the if (pqn->q) block, so mqd_mgr\nand related variables are only used when properly initialized.\n\n(cherry picked from commit 8bfe29d5c798940f797aa24135d2734c3ffce9de)"
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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/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c"
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],
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"versions": [
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{
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"version": "e1b73b64271d706079370b58b81292dafd373163",
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"lessThan": "58e866711b234571b0ce342c43d153a4786b32b8",
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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": "e1b73b64271d706079370b58b81292dafd373163",
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"lessThan": "012a026bae0212952b423a842b7e2c0bf21f8e7a",
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"status": "affected",
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"versionType": "git"
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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/gpu/drm/amd/amdkfd/kfd_process_queue_manager.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": "7.2.5",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "7.0",
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"versionEndExcluding": "7.2.5"
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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": "7.3"
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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/58e866711b234571b0ce342c43d153a4786b32b8"
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},
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{
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"url": "https://git.kernel.org/stable/c/012a026bae0212952b423a842b7e2c0bf21f8e7a"
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}
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],
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"title": "drm/amdkfd: fix scope of mqd_mgr dereference in pqm_debugfs_mqds",
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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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}
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} |