{"id":"CVE-2026-64507","state":"PUBLISHED","title":"x86/bugs: Enable IBPB flush on BPF JIT allocation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/bugs: Enable IBPB flush on BPF JIT allocation\n\nEnable hardening against JIT spraying when Spectre-v2 mitigations are in\nuse. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip\nenabling the IBPB flush if the BPF dispatcher is already using a retpoline\nsequence.\n\nThis hardening applies only when BPF-JIT is in use. Guard the enabling\nunder CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n.","publishedAt":"2026-07-25T08:52:01.008Z","updatedAt":"2026-08-19T16:28:18.513Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"25dbcd31781e2bc3cd63d873af1fcd06f863a126","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"cb27f3bf915cc0f20fc0c48da9059304e39ebd35","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"9354248fc1c33a844ca1872761f6668b393e8c37","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"52440e15d9628f8f239373c0f2e5e8f92feea2df","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"a3af84b0fa00ead01fcd0e28b5d773ff25990a0d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/include/asm/nospec-branch.h","arch/x86/kernel/cpu/bugs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.18","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/include/asm/nospec-branch.h","arch/x86/kernel/cpu/bugs.c"]}],"references":["https://git.kernel.org/stable/c/25dbcd31781e2bc3cd63d873af1fcd06f863a126","https://git.kernel.org/stable/c/cb27f3bf915cc0f20fc0c48da9059304e39ebd35","https://git.kernel.org/stable/c/9354248fc1c33a844ca1872761f6668b393e8c37","https://git.kernel.org/stable/c/8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1","https://git.kernel.org/stable/c/52440e15d9628f8f239373c0f2e5e8f92feea2df","https://git.kernel.org/stable/c/a3af84b0fa00ead01fcd0e28b5d773ff25990a0d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64507.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64507","state":"PUBLISHED","datePublished":"2026-07-25T08:52:01.008Z","dateUpdated":"2026-08-19T16:28:18.513Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.793Z"},"containers":{"cna":{"title":"x86/bugs: Enable IBPB flush on BPF JIT allocation","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/bugs: Enable IBPB flush on BPF JIT allocation\n\nEnable hardening against JIT spraying when Spectre-v2 mitigations are in\nuse. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip\nenabling the IBPB flush if the BPF dispatcher is already using a retpoline\nsequence.\n\nThis hardening applies only when BPF-JIT is in use. Guard the enabling\nunder CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"25dbcd31781e2bc3cd63d873af1fcd06f863a126","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"cb27f3bf915cc0f20fc0c48da9059304e39ebd35","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"9354248fc1c33a844ca1872761f6668b393e8c37","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"52440e15d9628f8f239373c0f2e5e8f92feea2df","versionType":"git"},{"version":"57631054fae6dcc9c892ae6310b58bbb6f6e5048","status":"affected","lessThan":"a3af84b0fa00ead01fcd0e28b5d773ff25990a0d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/include/asm/nospec-branch.h","arch/x86/kernel/cpu/bugs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.18","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/include/asm/nospec-branch.h","arch/x86/kernel/cpu/bugs.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/25dbcd31781e2bc3cd63d873af1fcd06f863a126"},{"url":"https://git.kernel.org/stable/c/cb27f3bf915cc0f20fc0c48da9059304e39ebd35"},{"url":"https://git.kernel.org/stable/c/9354248fc1c33a844ca1872761f6668b393e8c37"},{"url":"https://git.kernel.org/stable/c/8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1"},{"url":"https://git.kernel.org/stable/c/52440e15d9628f8f239373c0f2e5e8f92feea2df"},{"url":"https://git.kernel.org/stable/c/a3af84b0fa00ead01fcd0e28b5d773ff25990a0d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:28:18.513Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}