{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35887", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.112Z", "datePublished": "2024-05-19T08:34:43.507Z", "dateUpdated": "2026-08-05T11:30:41.288Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:30:41.288Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: fix use-after-free bugs caused by ax25_ds_del_timer\n\nWhen the ax25 device is detaching, the ax25_dev_device_down()\ncalls ax25_ds_del_timer() to cleanup the slave_timer. When\nthe timer handler is running, the ax25_ds_del_timer() that\ncalls del_timer() in it will return directly. As a result,\nthe use-after-free bugs could happen, one of the scenarios\nis shown below:\n\n (Thread 1) | (Thread 2)\n | ax25_ds_timeout()\nax25_dev_device_down() |\n ax25_ds_del_timer() |\n del_timer() |\n ax25_dev_put() //FREE |\n | ax25_dev-> //USE\n\nIn order to mitigate bugs, when the device is detaching, use\ntimer_shutdown_sync() to stop the timer." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The DAMA slave timer that is used after free is armed and repeatedly re-armed solely by frames from a remote AX.25 peer (SABM with the DAMA bit at net/ax25/ax25_in.c:407, and DAMA polls via ax25_ds_enquiry_response() → mod_timer()), reached over a point-to-point RF link or bpqether on the local Ethernet segment.\nAC:L - The attacker fully controls the racing side — keeping a DAMA-slave link up makes ax25_ds_timeout() fire every second and lets the attacker drive mod_timer() from the RX softirq at frame rate, so the window against ax25_dev_device_down()'s non-synchronous del_timer() can be hammered until it is hit, and a single re-arm after the free leaves an armed timer in freed memory.\nPR:N - AX.25 has no authentication whatsoever — the attacker only needs to transmit frames to a listening AX.25 port to turn on DAMA slave mode and arm the device timer; no account or credential on the target is involved.\nUI:N - No victim action on attacker-supplied content is needed; the free is triggered by a routine port/interface teardown (script-driven port cycling, TNC/serial or bpqether underlying device going down, module unload) while the attacker-maintained timer is active.\nS:U - The corruption is confined to kernel heap memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed ax25_dev is a kfree'd slab object that can be reallocated and read back through the still-live timer handler, and the surviving armed timer_list gives an attacker-influenced read of freed/reallocated memory usable for kernel address and data disclosure.\nI:H - mod_timer() on the freed object writes into reallocated memory, and the timer core later loads and calls ->function from the freed ax25_dev, yielding a heap-spray-based control-flow hijack primitive and arbitrary kernel memory modification.\nA:H - Even unexploited, dereferencing and re-arming a timer embedded in freed memory reliably causes slab corruption, list corruption, and kernel oops/panic, taking the system down." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ax25/ax25_dev.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "74204bf9050f7627aead9875fe4e07ba125cb19b", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c6a368f9c7af4c14b14d390c2543af8001c9bdb9", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "fd819ad3ecf6f3c232a06b27423ce9ed8c20da89", "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/ax25_dev.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.26", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.5", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "2.6.12", "versionEndExcluding": "6.6.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.8.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/74204bf9050f7627aead9875fe4e07ba125cb19b" }, { "url": "https://git.kernel.org/stable/c/c6a368f9c7af4c14b14d390c2543af8001c9bdb9" }, { "url": "https://git.kernel.org/stable/c/fd819ad3ecf6f3c232a06b27423ce9ed8c20da89" } ], "title": "ax25: fix use-after-free bugs caused by ax25_ds_del_timer", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-35887", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2024-05-29T18:31:26.964668Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:34:13.609Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:48.634Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/74204bf9050f7627aead9875fe4e07ba125cb19b", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/c6a368f9c7af4c14b14d390c2543af8001c9bdb9", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/fd819ad3ecf6f3c232a06b27423ce9ed8c20da89", "tags": [ "x_transferred" ] } ] } ] } }