{"id":"CVE-2024-26645","state":"PUBLISHED","title":"tracing: Ensure visibility when inserting an element into tracing_map","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Ensure visibility when inserting an element into tracing_map\n\nRunning the following two commands in parallel on a multi-processor\nAArch64 machine can sporadically produce an unexpected warning about\nduplicate histogram entries:\n\n $ while true; do\n     echo hist:key=id.syscall:val=hitcount > \\\n       /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger\n     cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist\n     sleep 0.001\n   done\n $ stress-ng --sysbadaddr $(nproc)\n\nThe warning looks as follows:\n\n[ 2911.172474] ------------[ cut here ]------------\n[ 2911.173111] Duplicates detected: 1\n[ 2911.173574] WARNING: CPU: 2 PID: 12247 at kernel/trace/tracing_map.c:983 tracing_map_sort_entries+0x3e0/0x408\n[ 2911.174702] Modules linked in: iscsi_ibft(E) iscsi_boot_sysfs(E) rfkill(E) af_packet(E) nls_iso8859_1(E) nls_cp437(E) vfat(E) fat(E) ena(E) tiny_power_button(E) qemu_fw_cfg(E) button(E) fuse(E) efi_pstore(E) ip_tables(E) x_tables(E) xfs(E) libcrc32c(E) aes_ce_blk(E) aes_ce_cipher(E) crct10dif_ce(E) polyval_ce(E) polyval_generic(E) ghash_ce(E) gf128mul(E) sm4_ce_gcm(E) sm4_ce_ccm(E) sm4_ce(E) sm4_ce_cipher(E) sm4(E) sm3_ce(E) sm3(E) sha3_ce(E) sha512_ce(E) sha512_arm64(E) sha2_ce(E) sha256_arm64(E) nvme(E) sha1_ce(E) nvme_core(E) nvme_auth(E) t10_pi(E) sg(E) scsi_mod(E) scsi_common(E) efivarfs(E)\n[ 2911.174738] Unloaded tainted modules: cppc_cpufreq(E):1\n[ 2911.180985] CPU: 2 PID: 12247 Comm: cat Kdump: loaded Tainted: G            E      6.7.0-default #2 1b58bbb22c97e4399dc09f92d309344f69c44a01\n[ 2911.182398] Hardware name: Amazon EC2 c7g.8xlarge/, BIOS 1.0 11/1/2018\n[ 2911.183208] pstate: 61400005 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n[ 2911.184038] pc : tracing_map_sort_entries+0x3e0/0x408\n[ 2911.184667] lr : tracing_map_sort_entries+0x3e0/0x408\n[ 2911.185310] sp : ffff8000a1513900\n[ 2911.185750] x29: ffff8000a1513900 x28: ffff0003f272fe80 x27: 0000000000000001\n[ 2911.186600] x26: ffff0003f272fe80 x25: 0000000000000030 x24: 0000000000000008\n[ 2911.187458] x23: ffff0003c5788000 x22: ffff0003c16710c8 x21: ffff80008017f180\n[ 2911.188310] x20: ffff80008017f000 x19: ffff80008017f180 x18: ffffffffffffffff\n[ 2911.189160] x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000a15134b8\n[ 2911.190015] x14: 0000000000000000 x13: 205d373432323154 x12: 5b5d313131333731\n[ 2911.190844] x11: 00000000fffeffff x10: 00000000fffeffff x9 : ffffd1b78274a13c\n[ 2911.191716] x8 : 000000000017ffe8 x7 : c0000000fffeffff x6 : 000000000057ffa8\n[ 2911.192554] x5 : ffff0012f6c24ec0 x4 : 0000000000000000 x3 : ffff2e5b72b5d000\n[ 2911.193404] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0003ff254480\n[ 2911.194259] Call trace:\n[ 2911.194626]  tracing_map_sort_entries+0x3e0/0x408\n[ 2911.195220]  hist_show+0x124/0x800\n[ 2911.195692]  seq_read_iter+0x1d4/0x4e8\n[ 2911.196193]  seq_read+0xe8/0x138\n[ 2911.196638]  vfs_read+0xc8/0x300\n[ 2911.197078]  ksys_read+0x70/0x108\n[ 2911.197534]  __arm64_sys_read+0x24/0x38\n[ 2911.198046]  invoke_syscall+0x78/0x108\n[ 2911.198553]  el0_svc_common.constprop.0+0xd0/0xf8\n[ 2911.199157]  do_el0_svc+0x28/0x40\n[ 2911.199613]  el0_svc+0x40/0x178\n[ 2911.200048]  el0t_64_sync_handler+0x13c/0x158\n[ 2911.200621]  el0t_64_sync+0x1a8/0x1b0\n[ 2911.201115] ---[ end trace 0000000000000000 ]---\n\nThe problem appears to be caused by CPU reordering of writes issued from\n__tracing_map_insert().\n\nThe check for the presence of an element with a given key in this\nfunction is:\n\n val = READ_ONCE(entry->val);\n if (val && keys_match(key, val->key, map->key_size)) ...\n\nThe write of a new entry is:\n\n elt = get_free_elt(map);\n memcpy(elt->key, key, map->key_size);\n entry->val = elt;\n\nThe \"memcpy(elt->key, key, map->key_size);\" and \"entry->val = elt;\"\nstores may become visible in the reversed order on another CPU. This\nsecond CPU might then incorrectly determine that a new key doesn't match\nan already present val->key and subse\n---truncated---","publishedAt":"2024-03-26T15:17:18.203Z","updatedAt":"2026-10-15T00:38:21.768Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"5022b331c041e8c54b9a6a3251579bd1e8c0fc0b","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"dad9b28f675ed99b4dec261db2a397efeb80b74c","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"ef70dfa0b1e5084f32635156c9a5c795352ad860","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"aef1cb00856ccfd614467cfb50b791278992e177","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"f4f7e696db0274ff560482cc52eddbf0551d4b7a","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"a1eebe76e187dbe11ca299f8dbb6e45d5b1889e7","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"bf4aeff7da85c3becd39fb73bac94122331c30fb","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"2b44760609e9eaafc9d234a6883d042fc21132a7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/tracing_map.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"4.19.307","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.269","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.210","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.76","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.15","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.3","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/tracing_map.c"]}],"references":["https://git.kernel.org/stable/c/5022b331c041e8c54b9a6a3251579bd1e8c0fc0b","https://git.kernel.org/stable/c/dad9b28f675ed99b4dec261db2a397efeb80b74c","https://git.kernel.org/stable/c/ef70dfa0b1e5084f32635156c9a5c795352ad860","https://git.kernel.org/stable/c/aef1cb00856ccfd614467cfb50b791278992e177","https://git.kernel.org/stable/c/f4f7e696db0274ff560482cc52eddbf0551d4b7a","https://git.kernel.org/stable/c/a1eebe76e187dbe11ca299f8dbb6e45d5b1889e7","https://git.kernel.org/stable/c/bf4aeff7da85c3becd39fb73bac94122331c30fb","https://git.kernel.org/stable/c/2b44760609e9eaafc9d234a6883d042fc21132a7","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html","https://cert-portal.siemens.com/productcert/html/ssa-398330.html","https://cert-portal.siemens.com/productcert/html/ssa-613116.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:10.607Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/26xxx/CVE-2024-26645.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-26645","state":"PUBLISHED","datePublished":"2024-03-26T15:17:18.203Z","dateUpdated":"2026-10-15T00:38:21.768Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-19T14:20:24.138Z"},"containers":{"cna":{"title":"tracing: Ensure visibility when inserting an element into tracing_map","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Ensure visibility when inserting an element into tracing_map\n\nRunning the following two commands in parallel on a multi-processor\nAArch64 machine can sporadically produce an unexpected warning about\nduplicate histogram entries:\n\n $ while true; do\n     echo hist:key=id.syscall:val=hitcount > \\\n       /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger\n     cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist\n     sleep 0.001\n   done\n $ stress-ng --sysbadaddr $(nproc)\n\nThe warning looks as follows:\n\n[ 2911.172474] ------------[ cut here ]------------\n[ 2911.173111] Duplicates detected: 1\n[ 2911.173574] WARNING: CPU: 2 PID: 12247 at kernel/trace/tracing_map.c:983 tracing_map_sort_entries+0x3e0/0x408\n[ 2911.174702] Modules linked in: iscsi_ibft(E) iscsi_boot_sysfs(E) rfkill(E) af_packet(E) nls_iso8859_1(E) nls_cp437(E) vfat(E) fat(E) ena(E) tiny_power_button(E) qemu_fw_cfg(E) button(E) fuse(E) efi_pstore(E) ip_tables(E) x_tables(E) xfs(E) libcrc32c(E) aes_ce_blk(E) aes_ce_cipher(E) crct10dif_ce(E) polyval_ce(E) polyval_generic(E) ghash_ce(E) gf128mul(E) sm4_ce_gcm(E) sm4_ce_ccm(E) sm4_ce(E) sm4_ce_cipher(E) sm4(E) sm3_ce(E) sm3(E) sha3_ce(E) sha512_ce(E) sha512_arm64(E) sha2_ce(E) sha256_arm64(E) nvme(E) sha1_ce(E) nvme_core(E) nvme_auth(E) t10_pi(E) sg(E) scsi_mod(E) scsi_common(E) efivarfs(E)\n[ 2911.174738] Unloaded tainted modules: cppc_cpufreq(E):1\n[ 2911.180985] CPU: 2 PID: 12247 Comm: cat Kdump: loaded Tainted: G            E      6.7.0-default #2 1b58bbb22c97e4399dc09f92d309344f69c44a01\n[ 2911.182398] Hardware name: Amazon EC2 c7g.8xlarge/, BIOS 1.0 11/1/2018\n[ 2911.183208] pstate: 61400005 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n[ 2911.184038] pc : tracing_map_sort_entries+0x3e0/0x408\n[ 2911.184667] lr : tracing_map_sort_entries+0x3e0/0x408\n[ 2911.185310] sp : ffff8000a1513900\n[ 2911.185750] x29: ffff8000a1513900 x28: ffff0003f272fe80 x27: 0000000000000001\n[ 2911.186600] x26: ffff0003f272fe80 x25: 0000000000000030 x24: 0000000000000008\n[ 2911.187458] x23: ffff0003c5788000 x22: ffff0003c16710c8 x21: ffff80008017f180\n[ 2911.188310] x20: ffff80008017f000 x19: ffff80008017f180 x18: ffffffffffffffff\n[ 2911.189160] x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000a15134b8\n[ 2911.190015] x14: 0000000000000000 x13: 205d373432323154 x12: 5b5d313131333731\n[ 2911.190844] x11: 00000000fffeffff x10: 00000000fffeffff x9 : ffffd1b78274a13c\n[ 2911.191716] x8 : 000000000017ffe8 x7 : c0000000fffeffff x6 : 000000000057ffa8\n[ 2911.192554] x5 : ffff0012f6c24ec0 x4 : 0000000000000000 x3 : ffff2e5b72b5d000\n[ 2911.193404] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0003ff254480\n[ 2911.194259] Call trace:\n[ 2911.194626]  tracing_map_sort_entries+0x3e0/0x408\n[ 2911.195220]  hist_show+0x124/0x800\n[ 2911.195692]  seq_read_iter+0x1d4/0x4e8\n[ 2911.196193]  seq_read+0xe8/0x138\n[ 2911.196638]  vfs_read+0xc8/0x300\n[ 2911.197078]  ksys_read+0x70/0x108\n[ 2911.197534]  __arm64_sys_read+0x24/0x38\n[ 2911.198046]  invoke_syscall+0x78/0x108\n[ 2911.198553]  el0_svc_common.constprop.0+0xd0/0xf8\n[ 2911.199157]  do_el0_svc+0x28/0x40\n[ 2911.199613]  el0_svc+0x40/0x178\n[ 2911.200048]  el0t_64_sync_handler+0x13c/0x158\n[ 2911.200621]  el0t_64_sync+0x1a8/0x1b0\n[ 2911.201115] ---[ end trace 0000000000000000 ]---\n\nThe problem appears to be caused by CPU reordering of writes issued from\n__tracing_map_insert().\n\nThe check for the presence of an element with a given key in this\nfunction is:\n\n val = READ_ONCE(entry->val);\n if (val && keys_match(key, val->key, map->key_size)) ...\n\nThe write of a new entry is:\n\n elt = get_free_elt(map);\n memcpy(elt->key, key, map->key_size);\n entry->val = elt;\n\nThe \"memcpy(elt->key, key, map->key_size);\" and \"entry->val = elt;\"\nstores may become visible in the reversed order on another CPU. This\nsecond CPU might then incorrectly determine that a new key doesn't match\nan already present val->key and subse\n---truncated---"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"5022b331c041e8c54b9a6a3251579bd1e8c0fc0b","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"dad9b28f675ed99b4dec261db2a397efeb80b74c","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"ef70dfa0b1e5084f32635156c9a5c795352ad860","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"aef1cb00856ccfd614467cfb50b791278992e177","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"f4f7e696db0274ff560482cc52eddbf0551d4b7a","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"a1eebe76e187dbe11ca299f8dbb6e45d5b1889e7","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"bf4aeff7da85c3becd39fb73bac94122331c30fb","versionType":"git"},{"version":"c193707dde77ace92a649cd59a17e105e2fbeaef","status":"affected","lessThan":"2b44760609e9eaafc9d234a6883d042fc21132a7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/tracing_map.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"4.19.307","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.269","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.210","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.76","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.15","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.3","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/tracing_map.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5022b331c041e8c54b9a6a3251579bd1e8c0fc0b"},{"url":"https://git.kernel.org/stable/c/dad9b28f675ed99b4dec261db2a397efeb80b74c"},{"url":"https://git.kernel.org/stable/c/ef70dfa0b1e5084f32635156c9a5c795352ad860"},{"url":"https://git.kernel.org/stable/c/aef1cb00856ccfd614467cfb50b791278992e177"},{"url":"https://git.kernel.org/stable/c/f4f7e696db0274ff560482cc52eddbf0551d4b7a"},{"url":"https://git.kernel.org/stable/c/a1eebe76e187dbe11ca299f8dbb6e45d5b1889e7"},{"url":"https://git.kernel.org/stable/c/bf4aeff7da85c3becd39fb73bac94122331c30fb"},{"url":"https://git.kernel.org/stable/c/2b44760609e9eaafc9d234a6883d042fc21132a7"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:01:24.992Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"4.19.307"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.4.269"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.10.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.15.149"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.1.76"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.6.15"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-26645","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-05-29T14:23:28.207860Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:48:27.214Z"}},{"title":"CVE Program 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