{"id":"CVE-2023-53646","state":"PUBLISHED","title":"drm/i915/perf: add sentinel to xehp_oa_b_counters","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/perf: add sentinel to xehp_oa_b_counters\n\nArrays passed to reg_in_range_table should end with empty record.\n\nThe patch solves KASAN detected bug with signature:\nBUG: KASAN: global-out-of-bounds in xehp_is_valid_b_counter_addr+0x2c7/0x350 [i915]\nRead of size 4 at addr ffffffffa1555d90 by task perf/1518\n\nCPU: 4 PID: 1518 Comm: perf Tainted: G U 6.4.0-kasan_438-g3303d06107f3+ #1\nHardware name: Intel Corporation Meteor Lake Client Platform/MTL-P DDR5 SODIMM SBS RVP, BIOS MTLPFWI1.R00.3223.D80.2305311348 05/31/2023\nCall Trace:\n<TASK>\n...\nxehp_is_valid_b_counter_addr+0x2c7/0x350 [i915]\n\n(cherry picked from commit 2f42c5afb34b5696cf5fe79e744f99be9b218798)","publishedAt":"2025-10-07T15:19:44.412Z","updatedAt":"2026-08-05T09:15:21.134Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0fa9349dda030fa847b36f880a5eea25c3202b66","status":"affected","lessThan":"21d92025e80629fd5c25cd6751f8cf38c784dd4a","versionType":"git"},{"version":"0fa9349dda030fa847b36f880a5eea25c3202b66","status":"affected","lessThan":"785b3f667b4bf98804cad135005e964df0c750de","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/i915/i915_perf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.4.7","status":"unaffected","lessThanOrEqual":"6.4.*","versionType":"semver"},{"version":"6.5","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/i915/i915_perf.c"]}],"references":["https://git.kernel.org/stable/c/21d92025e80629fd5c25cd6751f8cf38c784dd4a","https://git.kernel.org/stable/c/785b3f667b4bf98804cad135005e964df0c750de"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/53xxx/CVE-2023-53646.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53646","state":"PUBLISHED","datePublished":"2025-10-07T15:19:44.412Z","dateUpdated":"2026-08-05T09:15:21.134Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-10-07T15:16:59.659Z"},"containers":{"cna":{"title":"drm/i915/perf: add sentinel to xehp_oa_b_counters","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/perf: add sentinel to xehp_oa_b_counters\n\nArrays passed to reg_in_range_table should end with empty record.\n\nThe patch solves KASAN detected bug with signature:\nBUG: KASAN: global-out-of-bounds in xehp_is_valid_b_counter_addr+0x2c7/0x350 [i915]\nRead of size 4 at addr ffffffffa1555d90 by task perf/1518\n\nCPU: 4 PID: 1518 Comm: perf Tainted: G U 6.4.0-kasan_438-g3303d06107f3+ #1\nHardware name: Intel Corporation Meteor Lake Client Platform/MTL-P DDR5 SODIMM SBS RVP, BIOS MTLPFWI1.R00.3223.D80.2305311348 05/31/2023\nCall Trace:\n<TASK>\n...\nxehp_is_valid_b_counter_addr+0x2c7/0x350 [i915]\n\n(cherry picked from commit 2f42c5afb34b5696cf5fe79e744f99be9b218798)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0fa9349dda030fa847b36f880a5eea25c3202b66","status":"affected","lessThan":"21d92025e80629fd5c25cd6751f8cf38c784dd4a","versionType":"git"},{"version":"0fa9349dda030fa847b36f880a5eea25c3202b66","status":"affected","lessThan":"785b3f667b4bf98804cad135005e964df0c750de","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/i915/i915_perf.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.2","versionType":"semver"},{"version":"6.4.7","status":"unaffected","lessThanOrEqual":"6.4.*","versionType":"semver"},{"version":"6.5","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/i915/i915_perf.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/21d92025e80629fd5c25cd6751f8cf38c784dd4a"},{"url":"https://git.kernel.org/stable/c/785b3f667b4bf98804cad135005e964df0c750de"}],"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 code is reached only through the DRM_IOCTL_I915_PERF_ADD_CONFIG ioctl on a local i915 device/render node (/dev/dri/renderD128), requiring local system access. There is no network-facing path to i915 perf configuration.\nAC:L - A single ioctl carrying any 32-bit register address outside the two in-bounds ranges deterministically drives the sentinel-less loop past the end of the 16-byte array; no race, timing, or memory-layout luck is needed to trigger the out-of-bounds access.\nPR:L - The ioctl is DRM_RENDER_ALLOW, so no DRM master or authentication is required — only an open render node, which is group/world accessible on typical desktop, Android and container deployments. On the widely used profiling configuration dev.i915.perf_stream_paranoid=0 (the documented setting for unprivileged Intel GPU metrics collection) the perfmon_capable() check is bypassed entirely, leaving an ordinary unprivileged user able to reach the bug.\nUI:N - The attacker triggers the flaw entirely on their own by issuing the ioctl from their own process; no victim action, file open, or mount is involved.\nS:U - The out-of-bounds read and the resulting register-allowlist bypass occur within the kernel's own security authority on the same host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The walk reads kernel module .rodata past the object bounds with no bound other than encountering a zero pair, and the function's boolean result is returned to userspace as an accept/reject oracle, letting an attacker probe addresses and reconstruct the contents of the out-of-bounds kernel memory.\nI:H - The OOB data is interpreted as additional whitelist ranges, so registers that were never meant to be programmable are accepted and then emitted as MI_LOAD_REGISTER_IMM in a kernel-built batch executed unfiltered by the GPU command streamer, giving attacker-controlled 32-bit writes to non-whitelisted GPU MMIO and defeating the very allowlist this code enforces.\nA:H - The unterminated walk can run into unmapped module memory and oops, and it reliably panics kernels built with KASAN (the reported crash signature) or configured with kasan.fault=panic/panic_on_warn; additionally, programming out-of-allowlist GPU registers can hang or wedge the GPU for all users."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T09:15:21.134Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.4.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.5"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}