{"id":"CVE-2023-52757","state":"PUBLISHED","title":"smb: client: fix potential deadlock when releasing mids","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential deadlock when releasing mids\n\nAll release_mid() callers seem to hold a reference of @mid so there is\nno need to call kref_put(&mid->refcount, __release_mid) under\n@server->mid_lock spinlock.  If they don't, then an use-after-free bug\nwould have occurred anyways.\n\nBy getting rid of such spinlock also fixes a potential deadlock as\nshown below\n\nCPU 0                                CPU 1\n------------------------------------------------------------------\ncifs_demultiplex_thread()            cifs_debug_data_proc_show()\n release_mid()\n  spin_lock(&server->mid_lock);\n                                     spin_lock(&cifs_tcp_ses_lock)\n\t\t\t\t      spin_lock(&server->mid_lock)\n  __release_mid()\n   smb2_find_smb_tcon()\n    spin_lock(&cifs_tcp_ses_lock) *deadlock*","publishedAt":"2024-05-21T15:30:44.248Z","updatedAt":"2026-05-23T15:26:56.960Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"99f476e27aad5964ab13777d84fda67d1356dec1","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"ce49569079a9d4cad26c0f1d4653382fd9a5ca7a","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"9eb44db68c5b7f5aa22b8fc7de74a3e2e08d1f29","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"b9bb9607b1fc12fca51f5632da25b36975f599bf","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"c1a5962f1462b64fe7b69f20a4b6af8067bc2d26","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"e6322fd177c6885a21dd4609dc5e5c973d1a2eb7","versionType":"git"},{"version":"9871dea42034ee6e73bb2b97ba0284d3d462b230","status":"affected","versionType":"git"},{"version":"5.4.6","status":"affected","lessThan":"5.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/cifsproto.h","fs/smb/client/smb2misc.c","fs/smb/client/transport.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.237","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.181","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.64","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.13","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6.3","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/cifsproto.h","fs/smb/client/smb2misc.c","fs/smb/client/transport.c"]}],"references":["https://git.kernel.org/stable/c/99f476e27aad5964ab13777d84fda67d1356dec1","https://git.kernel.org/stable/c/ce49569079a9d4cad26c0f1d4653382fd9a5ca7a","https://git.kernel.org/stable/c/9eb44db68c5b7f5aa22b8fc7de74a3e2e08d1f29","https://git.kernel.org/stable/c/b9bb9607b1fc12fca51f5632da25b36975f599bf","https://git.kernel.org/stable/c/c1a5962f1462b64fe7b69f20a4b6af8067bc2d26","https://git.kernel.org/stable/c/e6322fd177c6885a21dd4609dc5e5c973d1a2eb7","https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52757.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52757","state":"PUBLISHED","datePublished":"2024-05-21T15:30:44.248Z","dateUpdated":"2026-05-23T15:26:56.960Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T15:19:24.237Z"},"containers":{"cna":{"title":"smb: client: fix potential deadlock when releasing mids","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential deadlock when releasing mids\n\nAll release_mid() callers seem to hold a reference of @mid so there is\nno need to call kref_put(&mid->refcount, __release_mid) under\n@server->mid_lock spinlock.  If they don't, then an use-after-free bug\nwould have occurred anyways.\n\nBy getting rid of such spinlock also fixes a potential deadlock as\nshown below\n\nCPU 0                                CPU 1\n------------------------------------------------------------------\ncifs_demultiplex_thread()            cifs_debug_data_proc_show()\n release_mid()\n  spin_lock(&server->mid_lock);\n                                     spin_lock(&cifs_tcp_ses_lock)\n\t\t\t\t      spin_lock(&server->mid_lock)\n  __release_mid()\n   smb2_find_smb_tcon()\n    spin_lock(&cifs_tcp_ses_lock) *deadlock*"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"99f476e27aad5964ab13777d84fda67d1356dec1","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"ce49569079a9d4cad26c0f1d4653382fd9a5ca7a","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"9eb44db68c5b7f5aa22b8fc7de74a3e2e08d1f29","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"b9bb9607b1fc12fca51f5632da25b36975f599bf","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"c1a5962f1462b64fe7b69f20a4b6af8067bc2d26","versionType":"git"},{"version":"7b71843fa7028475b052107664cbe120156a2cfc","status":"affected","lessThan":"e6322fd177c6885a21dd4609dc5e5c973d1a2eb7","versionType":"git"},{"version":"9871dea42034ee6e73bb2b97ba0284d3d462b230","status":"affected","versionType":"git"},{"version":"5.4.6","status":"affected","lessThan":"5.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/cifsproto.h","fs/smb/client/smb2misc.c","fs/smb/client/transport.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.237","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.181","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.64","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.13","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6.3","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/cifsproto.h","fs/smb/client/smb2misc.c","fs/smb/client/transport.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/99f476e27aad5964ab13777d84fda67d1356dec1"},{"url":"https://git.kernel.org/stable/c/ce49569079a9d4cad26c0f1d4653382fd9a5ca7a"},{"url":"https://git.kernel.org/stable/c/9eb44db68c5b7f5aa22b8fc7de74a3e2e08d1f29"},{"url":"https://git.kernel.org/stable/c/b9bb9607b1fc12fca51f5632da25b36975f599bf"},{"url":"https://git.kernel.org/stable/c/c1a5962f1462b64fe7b69f20a4b6af8067bc2d26"},{"url":"https://git.kernel.org/stable/c/e6322fd177c6885a21dd4609dc5e5c973d1a2eb7"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T15:26:56.960Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.237"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.15.181"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.1.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.5.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.6.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.6"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE 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