{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50867","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-30T12:06:07.136Z","datePublished":"2025-12-30T12:15:38.520Z","dateUpdated":"2026-08-05T08:59:53.122Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:59:53.122Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage\n\nadreno_show_object() is a trap!  It will re-allocate the pointer it is\npassed on first call, when the data is ascii85 encoded, using kvmalloc/\nkvfree().  Which means the data *passed* to it must be kvmalloc'd, ie.\nwe cannot use the state_kcalloc() helper.\n\nThis partially reverts commit ec8f1813bf8d (\"drm/msm/a6xx: Replace\nkcalloc() with kvzalloc()\"), but adds the missing kvfree() to fix the\nmemory leak that was present previously.  And adds a warning comment.\n\nPatchwork: https://patchwork.freedesktop.org/patch/507014/"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable show/encode path is reached after a local GPU hang or iova fault captures crash state via msm_gpu_crashstate_capture(); an unprivileged process triggers that through DRM render-node submits (MSM_GEM_SUBMIT). There is no network or adjacent-packet path into a6xx_show/adreno_show_object.\nAC:L - An attacker fully controls both sides: submit work that hangs or faults the a6xx GPU, then rely on the deterministic ascii85 reallocation in adreno_show_object() when the dump is read. No race or attacker-uncontrollable memory-layout precondition is required.\nPR:L - Unprivileged users can open /dev/dri/renderD* and hang the GPU. On the primary msm deployments (ChromeOS/Android), crash_reporter/udev_collector automatically reads /sys/class/devcoredump/devcdN/data for the adreno driver, invoking the bad kvfree without the attacker needing root. Choosing the higher-severity PR:L over PR:H for that reasonable scenario.\nUI:N - The attacker submits the hanging GPU work themselves, and automatic device-coredump collection invokes a6xx_show without any separate victim mount/open/interactive action.\nS:U - The invalid free corrupts host kernel allocator state within the same OS security authority; this is a local privilege-escalation class bug, not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - adreno_show_object() kvfree()s an interior pointer into a state_kcalloc() memobj (past list_head), corrupting kvmalloc/SLUB freelist metadata; that heap corruption can be leveraged for arbitrary kernel memory disclosure, matching kernel CVSS guidance for memory-corruption bugs.\nI:H - The same interior-pointer free (and subsequent double-free of the memobj on a6xx_gpu_state_destroy) corrupts heap freelists and adjacent objects, enabling reuse and write/control-flow hijacking primitives rather than a benign bounded fault.\nA:H - The gitlab issue closed by the fix reports that reading the devcoredump triggers memory corruption; invalid free/double-free produce kernel oops/panic, which is Availability High under kernel CVSS guidance."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c","drivers/gpu/drm/msm/adreno/adreno_gpu.c"],"versions":[{"version":"b859f9b009bbfbc236d9b076c64c59ccb41b8737","lessThan":"4b1bbc0571a5d7ee10f754186dc3d619b9ced5c1","status":"affected","versionType":"git"},{"version":"b859f9b009bbfbc236d9b076c64c59ccb41b8737","lessThan":"83d18e9d9c0150d98dc24e3642ea93f5e245322c","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c","drivers/gpu/drm/msm/adreno/adreno_gpu.c"],"versions":[{"version":"5.17","status":"affected"},{"version":"0","lessThan":"5.17","status":"unaffected","versionType":"semver"},{"version":"6.0.7","lessThanOrEqual":"6.0.*","status":"unaffected","versionType":"semver"},{"version":"6.1","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":"5.17","versionEndExcluding":"6.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4b1bbc0571a5d7ee10f754186dc3d619b9ced5c1"},{"url":"https://git.kernel.org/stable/c/83d18e9d9c0150d98dc24e3642ea93f5e245322c"}],"title":"drm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage","x_generator":{"engine":"bippy-1.2.0"}}}}