UBUNTU-CVE-2025-39964
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.
02 / AFFECTED SOFTWARE
Affected packages
37 explicit affected versions
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38 explicit affected versions
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79 explicit affected versions
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90 explicit affected versions
134 explicit affected versions
113 explicit affected versions
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1 explicit affected versions
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77 explicit affected versions
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68 explicit affected versions
67 explicit affected versions
13 explicit affected versions
43 explicit affected versions
137 explicit affected versions
111 explicit affected versions
158 explicit affected versions
10 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
60 explicit affected versions
115 explicit affected versions
8 explicit affected versions
28 explicit affected versions
67 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285
- https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce
- https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285
- https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8
- https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042
- https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84
- https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d
- https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9
- https://ubuntu.com/security/CVE-2025-39964
- https://ubuntu.com/security/notices/USN-7907-1
- https://ubuntu.com/security/notices/USN-7907-2
- https://ubuntu.com/security/notices/USN-7907-3
- https://ubuntu.com/security/notices/USN-7907-4
- https://ubuntu.com/security/notices/USN-7907-5
- https://ubuntu.com/security/notices/USN-7921-1
- https://ubuntu.com/security/notices/USN-7921-2
- https://ubuntu.com/security/notices/USN-7922-1
- https://ubuntu.com/security/notices/USN-7922-2
- https://ubuntu.com/security/notices/USN-7922-3
- https://ubuntu.com/security/notices/USN-7922-4
- https://ubuntu.com/security/notices/USN-7922-5
- https://ubuntu.com/security/notices/USN-7928-1
- https://ubuntu.com/security/notices/USN-7928-2
- https://ubuntu.com/security/notices/USN-7928-3
- https://ubuntu.com/security/notices/USN-7928-4
- https://ubuntu.com/security/notices/USN-7928-5
- https://ubuntu.com/security/notices/USN-7930-1
- https://ubuntu.com/security/notices/USN-7930-2
- https://ubuntu.com/security/notices/USN-7931-1
- https://ubuntu.com/security/notices/USN-7931-2
- https://ubuntu.com/security/notices/USN-7931-3
- https://ubuntu.com/security/notices/USN-7931-4
- https://ubuntu.com/security/notices/USN-7931-5
- https://ubuntu.com/security/notices/USN-7934-1
- https://ubuntu.com/security/notices/USN-7935-1
- https://ubuntu.com/security/notices/USN-7936-1
- https://ubuntu.com/security/notices/USN-7937-1
- https://ubuntu.com/security/notices/USN-7938-1
- https://ubuntu.com/security/notices/USN-7939-1
- https://ubuntu.com/security/notices/USN-7939-2
- https://ubuntu.com/security/notices/USN-7940-1
- https://ubuntu.com/security/notices/USN-7940-2
- https://www.cve.org/CVERecord?id=CVE-2025-39964