{"id":"CVE-2026-23404","state":"PUBLISHED","title":"apparmor: replace recursive profile removal with iterative approach","description":"In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: replace recursive profile removal with iterative approach\n\nThe profile removal code uses recursion when removing nested profiles,\nwhich can lead to kernel stack exhaustion and system crashes.\n\nReproducer:\n  $ pf='a'; for ((i=0; i<1024; i++)); do\n      echo -e \"profile $pf { \\n }\" | apparmor_parser -K -a;\n      pf=\"$pf//x\";\n  done\n  $ echo -n a > /sys/kernel/security/apparmor/.remove\n\nReplace the recursive __aa_profile_list_release() approach with an\niterative approach in __remove_profile(). The function repeatedly\nfinds and removes leaf profiles until the entire subtree is removed,\nmaintaining the same removal semantic without recursion.","publishedAt":"2026-04-01T08:36:35.032Z","updatedAt":"2026-05-11T22:06:15.286Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"ea854f032190cc9f26dc4a0e727090c89e55e342","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"4fdc847b107321dec22bf8ecd6019b7af76d7886","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"b36a04284d0208be94e5e401409caa00e2bf1be1","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"33959a491e9fd557abfa5fce5ae4637d400915d3","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"999bd704b0b641527a5ed46f0d969deff8cfa68b","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"7eade846e013cbe8d2dc4a484463aa19e6515c7f","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"a6a941a1294ac5abe22053dc501d25aed96e48fe","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"ab09264660f9de5d05d1ef4e225aa447c63a8747","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/apparmor/policy.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.36","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.36","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.169","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.77","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.18","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.8","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/apparmor/policy.c"]}],"references":["https://git.kernel.org/stable/c/ea854f032190cc9f26dc4a0e727090c89e55e342","https://git.kernel.org/stable/c/4fdc847b107321dec22bf8ecd6019b7af76d7886","https://git.kernel.org/stable/c/b36a04284d0208be94e5e401409caa00e2bf1be1","https://git.kernel.org/stable/c/33959a491e9fd557abfa5fce5ae4637d400915d3","https://git.kernel.org/stable/c/999bd704b0b641527a5ed46f0d969deff8cfa68b","https://git.kernel.org/stable/c/7eade846e013cbe8d2dc4a484463aa19e6515c7f","https://git.kernel.org/stable/c/a6a941a1294ac5abe22053dc501d25aed96e48fe","https://git.kernel.org/stable/c/ab09264660f9de5d05d1ef4e225aa447c63a8747"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23404.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23404","state":"PUBLISHED","datePublished":"2026-04-01T08:36:35.032Z","dateUpdated":"2026-05-11T22:06:15.286Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:46.012Z"},"containers":{"cna":{"title":"apparmor: replace recursive profile removal with iterative approach","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: replace recursive profile removal with iterative approach\n\nThe profile removal code uses recursion when removing nested profiles,\nwhich can lead to kernel stack exhaustion and system crashes.\n\nReproducer:\n  $ pf='a'; for ((i=0; i<1024; i++)); do\n      echo -e \"profile $pf { \\n }\" | apparmor_parser -K -a;\n      pf=\"$pf//x\";\n  done\n  $ echo -n a > /sys/kernel/security/apparmor/.remove\n\nReplace the recursive __aa_profile_list_release() approach with an\niterative approach in __remove_profile(). The function repeatedly\nfinds and removes leaf profiles until the entire subtree is removed,\nmaintaining the same removal semantic without recursion."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"ea854f032190cc9f26dc4a0e727090c89e55e342","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"4fdc847b107321dec22bf8ecd6019b7af76d7886","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"b36a04284d0208be94e5e401409caa00e2bf1be1","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"33959a491e9fd557abfa5fce5ae4637d400915d3","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"999bd704b0b641527a5ed46f0d969deff8cfa68b","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"7eade846e013cbe8d2dc4a484463aa19e6515c7f","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"a6a941a1294ac5abe22053dc501d25aed96e48fe","versionType":"git"},{"version":"c88d4c7b049e87998ac0a9f455aa545cc895ef92","status":"affected","lessThan":"ab09264660f9de5d05d1ef4e225aa447c63a8747","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/apparmor/policy.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.36","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.36","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.169","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.77","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.18","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.8","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/apparmor/policy.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ea854f032190cc9f26dc4a0e727090c89e55e342"},{"url":"https://git.kernel.org/stable/c/4fdc847b107321dec22bf8ecd6019b7af76d7886"},{"url":"https://git.kernel.org/stable/c/b36a04284d0208be94e5e401409caa00e2bf1be1"},{"url":"https://git.kernel.org/stable/c/33959a491e9fd557abfa5fce5ae4637d400915d3"},{"url":"https://git.kernel.org/stable/c/999bd704b0b641527a5ed46f0d969deff8cfa68b"},{"url":"https://git.kernel.org/stable/c/7eade846e013cbe8d2dc4a484463aa19e6515c7f"},{"url":"https://git.kernel.org/stable/c/a6a941a1294ac5abe22053dc501d25aed96e48fe"},{"url":"https://git.kernel.org/stable/c/ab09264660f9de5d05d1ef4e225aa447c63a8747"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:06:15.286Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.1.169"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.12.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.18.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"6.19.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.36","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}