cve-2024-40910
Vulnerability from cvelistv5
Published
2024-07-12 12:20
Modified
2024-12-19 09:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ax25: Fix refcount imbalance on inbound connections When releasing a socket in ax25_release(), we call netdev_put() to decrease the refcount on the associated ax.25 device. However, the execution path for accepting an incoming connection never calls netdev_hold(). This imbalance leads to refcount errors, and ultimately to kernel crashes. A typical call trace for the above situation will start with one of the following errors: refcount_t: decrement hit 0; leaking memory. refcount_t: underflow; use-after-free. And will then have a trace like: Call Trace: <TASK> ? show_regs+0x64/0x70 ? __warn+0x83/0x120 ? refcount_warn_saturate+0xb2/0x100 ? report_bug+0x158/0x190 ? prb_read_valid+0x20/0x30 ? handle_bug+0x3e/0x70 ? exc_invalid_op+0x1c/0x70 ? asm_exc_invalid_op+0x1f/0x30 ? refcount_warn_saturate+0xb2/0x100 ? refcount_warn_saturate+0xb2/0x100 ax25_release+0x2ad/0x360 __sock_release+0x35/0xa0 sock_close+0x19/0x20 [...] On reboot (or any attempt to remove the interface), the kernel gets stuck in an infinite loop: unregister_netdevice: waiting for ax0 to become free. Usage count = 0 This patch corrects these issues by ensuring that we call netdev_hold() and ax25_dev_hold() for new connections in ax25_accept(). This makes the logic leading to ax25_accept() match the logic for ax25_bind(): in both cases we increment the refcount, which is ultimately decremented in ax25_release().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c34fb0bd4a4237592c5ecb5b2e2531900c55774Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/52100fd74ad07b53a4666feafff1cd11436362d3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a723a6c8d4831cc8e2c7b0c9f3f0c010d4671964Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f4df9d6c8d4e4c818252b0419c2165d66eabd4ebPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3c34fb0bd4a4237592c5ecb5b2e2531900c55774Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/52100fd74ad07b53a4666feafff1cd11436362d3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a723a6c8d4831cc8e2c7b0c9f3f0c010d4671964Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f4df9d6c8d4e4c818252b0419c2165d66eabd4ebPatch
Impacted products
Vendor Product Version
Linux Linux Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
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   Linux Linux Version: 5.18
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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().\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:32:56.953Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-40910\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:32:56.953Z\", \"dateReserved\": \"2024-07-12T12:17:45.580Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:20:49.085Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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