143 lines
8.1 KiB
JSON
143 lines
8.1 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-2026-98919",
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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": "2026-09-25T10:25:14.380Z",
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"datePublished": "2026-10-23T12:01:55.092Z",
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"dateUpdated": "2026-10-23T12:05:08.723Z"
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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": "2026-10-23T12:05:08.723Z"
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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/xe: harden adjust_idledly() against divide-by-zero and overflow\n\nadjust_idledly() has several corner-case issues flagged during review:\n\n 1. If xe_gt_clock_init() failed to recognise the crystal clock,\n gt->info.timestamp_base is 0, which makes idledly_units_ps also 0.\n The subsequent DIV_ROUND_CLOSEST(..., idledly_units_ps) is then a\n divide-by-zero and panics the kernel.\n\n 2. The tick-to-ns conversions are done in u32:\n idledly * idledly_units_ps, (maxcnt - 1) * 1000\n Both overflow u32 before DIV_ROUND_CLOSEST() sees them.\n\n 3. If IDLE_WAIT_TIME reads back as 0, maxcnt evaluates to 0 and\n the maxcnt - 1 clamp wraps to 0xFFFFFFFF in u32.\n\n 4. The register only stores whole ticks, so the clamped ns value has\n to be converted to ticks and back. DIV_ROUND_CLOSEST() can round\n that conversion up past maxcnt:\n\n maxcnt = 640 ns, one tick = 666664 ps\n\n clamp: maxcnt - 1 = 639 ns\n ns -> ticks: 639000 / 666664 = 0.958 -> rounds to 1 tick\n tick -> ns: 1 * 666664 / 1000 = 667 ns\n\n 667 ns is programmed into RING_IDLEDLY, but 667 >= maxcnt (640),\n so xe_gt_WARN_ON() fires again on every subsequent init.\n\nReturn early if timestamp_base is 0 (the unknown-crystal path).\nDo the conversions in u64 via the *_ULL() helpers so they cannot wrap.\nClamp with a floor (DIV_ROUND_DOWN_ULL) so the programmed delay stays\nstrictly below maxcnt, and guard the maxcnt == 0 case with a zero delay\nwhile still writing RING_IDLEDLY so INHIBIT_SWITCH_UNTIL_PREEMPTED is\ncleared.\n\nv2: Drop the redundant warn on the timestamp_base == 0 path;\n xe_gt_clock_init() already warns on an unrecognised crystal clock.\n Keep the early return to avoid the divide-by-zero. - Vinay\n\nv3: Field-mask the RING_IDLEDLY write with REG_FIELD_PREP(IDLE_DELAY, ...)\n instead of writing the raw tick count, which could clobber\n INHIBIT_SWITCH_UNTIL_PREEMPTED and reserved bits. Split the\n inhibit-switch clear from the maxcnt clamp so a set inhibit bit no\n longer forces a needless delay overwrite when the delay itself is\n already valid. Use gt_to_xe(gt) instead of gt_to_xe(hwe->gt).\n\n(cherry picked from commit d864065ea25e9d12897c175de9176ce46677e176)"
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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/xe/xe_hw_engine.c"
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],
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"versions": [
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{
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"version": "d2de4410a88ffc6053300d03041cc73b8c85dbaf",
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"lessThan": "2bcbfc5e7bfa9cc76818c54db698da5bdc13d9ff",
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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": "d2de4410a88ffc6053300d03041cc73b8c85dbaf",
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"lessThan": "531d4cd03118224022dc21ae25af052ce2a9e267",
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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": "d2de4410a88ffc6053300d03041cc73b8c85dbaf",
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"lessThan": "90f467577ebc28c5bc4ba2f0f1b83a4419fb0740",
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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/xe/xe_hw_engine.c"
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],
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"versions": [
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{
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"version": "6.15",
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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": "6.15",
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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": "6.18.55",
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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": "7.2.9",
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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": "6.15",
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"versionEndExcluding": "6.18.55"
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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": "6.15",
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"versionEndExcluding": "7.2.9"
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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": "6.15",
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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/2bcbfc5e7bfa9cc76818c54db698da5bdc13d9ff"
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},
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{
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"url": "https://git.kernel.org/stable/c/531d4cd03118224022dc21ae25af052ce2a9e267"
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},
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{
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"url": "https://git.kernel.org/stable/c/90f467577ebc28c5bc4ba2f0f1b83a4419fb0740"
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}
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],
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"title": "drm/xe: harden adjust_idledly() against divide-by-zero and overflow",
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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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} |