{"id":"CVE-2026-23056","state":"PUBLISHED","title":"uacce: implement mremap in uacce_vm_ops to return -EPERM","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nuacce: implement mremap in uacce_vm_ops to return -EPERM\n\nThe current uacce_vm_ops does not support the mremap operation of\nvm_operations_struct. Implement .mremap to return -EPERM to remind\nusers.\n\nThe reason we need to explicitly disable mremap is that when the\ndriver does not implement .mremap, it uses the default mremap\nmethod. This could lead to a risk scenario:\n\nAn application might first mmap address p1, then mremap to p2,\nfollowed by munmap(p1), and finally munmap(p2). Since the default\nmremap copies the original vma's vm_private_data (i.e., q) to the\nnew vma, both munmap operations would trigger vma_close, causing\nq->qfr to be freed twice(qfr will be set to null here, so repeated\nrelease is ok).","publishedAt":"2026-02-04T16:07:34.787Z","updatedAt":"2026-05-11T21:59:08.964Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"78d99f062d42e3af2ca46bde1a8e46e0dfd372e3","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"ebfa85658a39b49ec3901ceea7535b73aa0429e6","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"75b29bdc935ff93b8e8bf6f6b4d8a4810b26e06f","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"4c042bc71474dbe417c268f4bfb8ec196f802f07","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"a407ddd61b3e6afc5ccfcd1478797171cf5686ee","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"ba29b59d124e725e0377f09b2044909c91d657a1","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"02695347be532b628f22488300d40c4eba48b9b7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/uacce/uacce.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/uacce/uacce.c"]}],"references":["https://git.kernel.org/stable/c/78d99f062d42e3af2ca46bde1a8e46e0dfd372e3","https://git.kernel.org/stable/c/ebfa85658a39b49ec3901ceea7535b73aa0429e6","https://git.kernel.org/stable/c/75b29bdc935ff93b8e8bf6f6b4d8a4810b26e06f","https://git.kernel.org/stable/c/4c042bc71474dbe417c268f4bfb8ec196f802f07","https://git.kernel.org/stable/c/a407ddd61b3e6afc5ccfcd1478797171cf5686ee","https://git.kernel.org/stable/c/ba29b59d124e725e0377f09b2044909c91d657a1","https://git.kernel.org/stable/c/02695347be532b628f22488300d40c4eba48b9b7"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23056.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23056","state":"PUBLISHED","datePublished":"2026-02-04T16:07:34.787Z","dateUpdated":"2026-05-11T21:59:08.964Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.951Z"},"containers":{"cna":{"title":"uacce: implement mremap in uacce_vm_ops to return -EPERM","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nuacce: implement mremap in uacce_vm_ops to return -EPERM\n\nThe current uacce_vm_ops does not support the mremap operation of\nvm_operations_struct. Implement .mremap to return -EPERM to remind\nusers.\n\nThe reason we need to explicitly disable mremap is that when the\ndriver does not implement .mremap, it uses the default mremap\nmethod. This could lead to a risk scenario:\n\nAn application might first mmap address p1, then mremap to p2,\nfollowed by munmap(p1), and finally munmap(p2). Since the default\nmremap copies the original vma's vm_private_data (i.e., q) to the\nnew vma, both munmap operations would trigger vma_close, causing\nq->qfr to be freed twice(qfr will be set to null here, so repeated\nrelease is ok)."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"78d99f062d42e3af2ca46bde1a8e46e0dfd372e3","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"ebfa85658a39b49ec3901ceea7535b73aa0429e6","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"75b29bdc935ff93b8e8bf6f6b4d8a4810b26e06f","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"4c042bc71474dbe417c268f4bfb8ec196f802f07","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"a407ddd61b3e6afc5ccfcd1478797171cf5686ee","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"ba29b59d124e725e0377f09b2044909c91d657a1","versionType":"git"},{"version":"015d239ac0142ad0e26567fd890ef8d171f13709","status":"affected","lessThan":"02695347be532b628f22488300d40c4eba48b9b7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/uacce/uacce.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/uacce/uacce.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/78d99f062d42e3af2ca46bde1a8e46e0dfd372e3"},{"url":"https://git.kernel.org/stable/c/ebfa85658a39b49ec3901ceea7535b73aa0429e6"},{"url":"https://git.kernel.org/stable/c/75b29bdc935ff93b8e8bf6f6b4d8a4810b26e06f"},{"url":"https://git.kernel.org/stable/c/4c042bc71474dbe417c268f4bfb8ec196f802f07"},{"url":"https://git.kernel.org/stable/c/a407ddd61b3e6afc5ccfcd1478797171cf5686ee"},{"url":"https://git.kernel.org/stable/c/ba29b59d124e725e0377f09b2044909c91d657a1"},{"url":"https://git.kernel.org/stable/c/02695347be532b628f22488300d40c4eba48b9b7"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:59:08.964Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.12.68"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.18.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}