{"id":"CVE-2026-45988","state":"PUBLISHED","title":"rxrpc: Fix re-decryption of RESPONSE packets","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix re-decryption of RESPONSE packets\n\nIf a RESPONSE packet gets a temporary failure during processing, it may end\nup in a partially decrypted state - and then get requeued for a retry.\n\nFix this by just discarding the packet; we will send another CHALLENGE\npacket and thereby elicit a further response.  Similarly, discard an\nincoming CHALLENGE packet if we get an error whilst generating a RESPONSE;\nthe server will send another CHALLENGE.","publishedAt":"2026-05-27T12:55:39.740Z","updatedAt":"2026-10-19T19:26:41.147Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"d61482be4aae1835b78875761206241835a7510e","versionType":"git"},{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"7b89868305052b94a91b708c462bc2281fa42a4a","versionType":"git"},{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"76cb9a2d252274adfae6e293a292434631a7d472","versionType":"git"},{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"f55b383070170e988e4dec28be2af1714d258521","versionType":"git"},{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"0422e7a4883f25101903f3e8105c0808aa5f4ce9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/rxrpc.h","net/rxrpc/conn_event.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.22","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.22","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.86","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/rxrpc.h","net/rxrpc/conn_event.c"]}],"references":["https://git.kernel.org/stable/c/d61482be4aae1835b78875761206241835a7510e","https://git.kernel.org/stable/c/7b89868305052b94a91b708c462bc2281fa42a4a","https://git.kernel.org/stable/c/76cb9a2d252274adfae6e293a292434631a7d472","https://git.kernel.org/stable/c/f55b383070170e988e4dec28be2af1714d258521","https://git.kernel.org/stable/c/0422e7a4883f25101903f3e8105c0808aa5f4ce9"],"weaknesses":["CWE-682"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45988.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45988","state":"PUBLISHED","datePublished":"2026-05-27T12:55:39.740Z","dateUpdated":"2026-10-19T19:26:41.147Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.090Z"},"containers":{"cna":{"title":"rxrpc: Fix re-decryption of RESPONSE packets","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix re-decryption of RESPONSE packets\n\nIf a RESPONSE packet gets a temporary failure during processing, it may end\nup in a partially decrypted state - and then get requeued for a retry.\n\nFix this by just discarding the packet; we will send another CHALLENGE\npacket and thereby elicit a further response.  Similarly, discard an\nincoming CHALLENGE packet if we get an error whilst generating a RESPONSE;\nthe server will send another CHALLENGE."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"d61482be4aae1835b78875761206241835a7510e","versionType":"git"},{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"7b89868305052b94a91b708c462bc2281fa42a4a","versionType":"git"},{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"76cb9a2d252274adfae6e293a292434631a7d472","versionType":"git"},{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"f55b383070170e988e4dec28be2af1714d258521","versionType":"git"},{"version":"17926a79320afa9b95df6b977b40cca6d8713cea","status":"affected","lessThan":"0422e7a4883f25101903f3e8105c0808aa5f4ce9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/rxrpc.h","net/rxrpc/conn_event.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.22","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.22","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.86","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/rxrpc.h","net/rxrpc/conn_event.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d61482be4aae1835b78875761206241835a7510e"},{"url":"https://git.kernel.org/stable/c/7b89868305052b94a91b708c462bc2281fa42a4a"},{"url":"https://git.kernel.org/stable/c/76cb9a2d252274adfae6e293a292434631a7d472"},{"url":"https://git.kernel.org/stable/c/f55b383070170e988e4dec28be2af1714d258521"},{"url":"https://git.kernel.org/stable/c/0422e7a4883f25101903f3e8105c0808aa5f4ce9"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - rxrpc is a UDP/IP network protocol; the vulnerable CHALLENGE/RESPONSE handling processes packets received from a remote peer (a connecting client, or a malicious/spoofed AFS server) over the network.\nAC:L - The bug is gated on a transient `-ENOMEM`/`-EAGAIN` during handshake processing, but an attacker can induce the required memory pressure by flooding the target with concurrent rxrpc handshakes, making the failing `GFP_NOFS` allocation reachable repeatably.\nPR:N - The CHALLENGE/RESPONSE packets are processed during the security handshake before the connection is secured (`RXRPC_CONN_SERVICE_CHALLENGING`), so no authentication or credentials are needed to reach the code.\nUI:N - A server processing an incoming RESPONSE, and automated AFS clients/daemons processing a CHALLENGE, require no human interaction to trigger the fault.\nS:U - The corruption and its impact are confined to the kernel's own memory/security authority; no crossing of a VM, IOMMU, or sandbox boundary is involved.\nC:H - The CHALLENGE-path refcount underflow frees the `rxrpc_connection` while still referenced; a UAF lets an attacker reallocate and read controlled freed-object contents, enabling kernel memory disclosure.\nI:H - The same use-after-free / refcount-underflow on the connection object enables heap grooming and write primitives over the freed structure, allowing kernel memory/control-flow corruption.\nA:H - The double-put UAF and the re-decryption of partially-decrypted RESPONSE packets reliably oops/panic the kernel and abort connections, causing a denial of service."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:29:02.856Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.12.86"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.18.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"7.0.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-45988","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:18:47.821756Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-682","lang":"en","type":"CWE","description":"CWE-682 Incorrect Calculation"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:26:41.147Z"}}]}}}