{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-40910","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-07-12T12:17:45.580Z","datePublished":"2024-07-12T12:20:49.085Z","dateUpdated":"2025-11-03T21:57:39.118Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T12:57:09.809Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nax25: Fix refcount imbalance on inbound connections\n\nWhen releasing a socket in ax25_release(), we call netdev_put() to\ndecrease the refcount on the associated ax.25 device. However, the\nexecution path for accepting an incoming connection never calls\nnetdev_hold(). This imbalance leads to refcount errors, and ultimately\nto kernel crashes.\n\nA typical call trace for the above situation will start with one of the\nfollowing errors:\n\n    refcount_t: decrement hit 0; leaking memory.\n    refcount_t: underflow; use-after-free.\n\nAnd will then have a trace like:\n\n    Call Trace:\n    <TASK>\n    ? show_regs+0x64/0x70\n    ? __warn+0x83/0x120\n    ? refcount_warn_saturate+0xb2/0x100\n    ? report_bug+0x158/0x190\n    ? prb_read_valid+0x20/0x30\n    ? handle_bug+0x3e/0x70\n    ? exc_invalid_op+0x1c/0x70\n    ? asm_exc_invalid_op+0x1f/0x30\n    ? refcount_warn_saturate+0xb2/0x100\n    ? refcount_warn_saturate+0xb2/0x100\n    ax25_release+0x2ad/0x360\n    __sock_release+0x35/0xa0\n    sock_close+0x19/0x20\n    [...]\n\nOn reboot (or any attempt to remove the interface), the kernel gets\nstuck in an infinite loop:\n\n    unregister_netdevice: waiting for ax0 to become free. Usage count = 0\n\nThis patch corrects these issues by ensuring that we call netdev_hold()\nand ax25_dev_hold() for new connections in ax25_accept(). This makes the\nlogic leading to ax25_accept() match the logic for ax25_bind(): in both\ncases we increment the refcount, which is ultimately decremented in\nax25_release()."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ax25/af_ax25.c"],"versions":[{"version":"9fd75b66b8f68498454d685dc4ba13192ae069b0","lessThan":"f4df9d6c8d4e4c818252b0419c2165d66eabd4eb","status":"affected","versionType":"git"},{"version":"9fd75b66b8f68498454d685dc4ba13192ae069b0","lessThan":"52100fd74ad07b53a4666feafff1cd11436362d3","status":"affected","versionType":"git"},{"version":"9fd75b66b8f68498454d685dc4ba13192ae069b0","lessThan":"a723a6c8d4831cc8e2c7b0c9f3f0c010d4671964","status":"affected","versionType":"git"},{"version":"9fd75b66b8f68498454d685dc4ba13192ae069b0","lessThan":"3c34fb0bd4a4237592c5ecb5b2e2531900c55774","status":"affected","versionType":"git"},{"version":"c44a453ffe16eb08acdc6129ac4fa0192dbc0456","status":"affected","versionType":"git"},{"version":"de55a1338e6a48ff1e41ea8db1432496fbe2a62b","status":"affected","versionType":"git"},{"version":"9e1e088a57c23251f1cfe9601bbd90ade2ea73b9","status":"affected","versionType":"git"},{"version":"b20a5ab0f5fb175750c6bafd4cf12daccf00c738","status":"affected","versionType":"git"},{"version":"452ae92b99062d2f6a34324eaf705a3b7eac9f8b","status":"affected","versionType":"git"},{"version":"534156dd4ed768e30a43de0036f45dca7c54818f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ax25/af_ax25.c"],"versions":[{"version":"5.18","status":"affected"},{"version":"0","lessThan":"5.18","status":"unaffected","versionType":"semver"},{"version":"6.1.95","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.35","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.9.6","lessThanOrEqual":"6.9.*","status":"unaffected","versionType":"semver"},{"version":"6.10","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.1.95"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.6.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.9.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.277"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.240"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.190"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/f4df9d6c8d4e4c818252b0419c2165d66eabd4eb"},{"url":"https://git.kernel.org/stable/c/52100fd74ad07b53a4666feafff1cd11436362d3"},{"url":"https://git.kernel.org/stable/c/a723a6c8d4831cc8e2c7b0c9f3f0c010d4671964"},{"url":"https://git.kernel.org/stable/c/3c34fb0bd4a4237592c5ecb5b2e2531900c55774"}],"title":"ax25: Fix refcount imbalance on inbound connections","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/f4df9d6c8d4e4c818252b0419c2165d66eabd4eb","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/52100fd74ad07b53a4666feafff1cd11436362d3","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/a723a6c8d4831cc8e2c7b0c9f3f0c010d4671964","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/3c34fb0bd4a4237592c5ecb5b2e2531900c55774","tags":["x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T21:57:39.118Z"}},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-40910","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical 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