CVE-2026-89718

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89718", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.752Z", "datePublished": "2026-09-11T19:46:31.443Z", "dateUpdated": "2026-10-30T12:32:49.752Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:32:49.752Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix out-of-bounds access in writeback_store()\n\nPatch series \"zram: fix stale scan bounds after reinitialization\".\n\nBoth writeback_store() and read_block_state() derive their table scan\nbounds from zram->disksize before acquiring dev_lock. If the device is\nreset and reinitialized with a smaller disksize between that read and lock\nacquisition, the bound can describe the old table while the scan operates\non the new one. This can lead to out-of-bounds slot accesses.\n\nMove both bound calculations under dev_lock so each bound remains\nconsistent with the table throughout its scan. Keep the fixes separate\nbecause the affected interfaces originate from different commits and can\nbe backported independently.\n\n\nThis patch (of 2):\n\nwriteback_store() calculates the table scan bounds before taking dev_lock.\nA reset followed by reconfiguration with a smaller disksize can therefore\nreplace zram->table while writeback_store() is waiting for the lock. Once\nit acquires the lock, it sees an initialized device but scans the new\ntable using the old upper bound, resulting in an out-of-bounds access.\n\nCalculate the number of pages while holding dev_lock so the scan bound\nmatches the table protected by the lock."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/zram/zram_drv.c"], "versions": [{"version": "a939888ec38bf1f33e4a903056677e92a4844244", "lessThan": "f1c5611f699a3aa2a85ebd5fec03dc9bc501e6d0", "status": "affected", "versionType": "git"}, {"version": "a939888ec38bf1f33e4a903056677e92a4844244", "lessThan": "c2745e657f0974871fbc60d46d48c2b04e581330", "status": "affected", "versionType": "git"}, {"version": "a939888ec38bf1f33e4a903056677e92a4844244", "lessThan": "4d82d60178b02797dbe529e01ac211b26670c49f", "status": "affected", "versionType": "git"}, {"version": "a939888ec38bf1f33e4a903056677e92a4844244", "lessThan": "ef073edd7cfd31aeb90eeab23273102c601f4d8e", "status": "affected", "versionType": "git"}, {"version": "a939888ec38bf1f33e4a903056677e92a4844244", "lessThan": "07a82a66f8c1894d92e51d97542c32ebf2c51b09", "status": "affected", "versionType": "git"}, {"version": "a939888ec38bf1f33e4a903056677e92a4844244", "lessThan": "894913e2d35c46ff19a77530907771ae57862b96", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/zram/zram_drv.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "5.0", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f1c5611f699a3aa2a85ebd5fec03dc9bc501e6d0"}, {"url": "https://git.kernel.org/stable/c/c2745e657f0974871fbc60d46d48c2b04e581330"}, {"url": "https://git.kernel.org/stable/c/4d82d60178b02797dbe529e01ac211b26670c49f"}, {"url": "https://git.kernel.org/stable/c/ef073edd7cfd31aeb90eeab23273102c601f4d8e"}, {"url": "https://git.kernel.org/stable/c/07a82a66f8c1894d92e51d97542c32ebf2c51b09"}, {"url": "https://git.kernel.org/stable/c/894913e2d35c46ff19a77530907771ae57862b96"}], "title": "zram: fix out-of-bounds access in writeback_store()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/block/zram/zram_drv.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f1c5611f699a3aa2a85ebd5fec03dc9bc501e6d0", "status": "affected", "version": "a939888ec38bf1f33e4a903056677e92a4844244", "versionType": "git"}, {"lessThan": "c2745e657f0974871fbc60d46d48c2b04e581330", "status": "affected", "version": "a939888ec38bf1f33e4a903056677e92a4844244", "versionType": "git"}, {"lessThan": "4d82d60178b02797dbe529e01ac211b26670c49f", "status": "affected", "version": "a939888ec38bf1f33e4a903056677e92a4844244", "versionType": "git"}, {"lessThan": "ef073edd7cfd31aeb90eeab23273102c601f4d8e", "status": "affected", "version": "a939888ec38bf1f33e4a903056677e92a4844244", "versionType": "git"}, {"lessThan": "07a82a66f8c1894d92e51d97542c32ebf2c51b09", "status": "affected", "version": "a939888ec38bf1f33e4a903056677e92a4844244", "versionType": "git"}, {"lessThan": "894913e2d35c46ff19a77530907771ae57862b96", "status": "affected", "version": "a939888ec38bf1f33e4a903056677e92a4844244", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/block/zram/zram_drv.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"lessThan": "5.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix out-of-bounds access in writeback_store()\n\nPatch series \"zram: fix stale scan bounds after reinitialization\".\n\nBoth writeback_store() and read_block_state() derive their table scan\nbounds from zram->disksize before acquiring dev_lock. If the device is\nreset and reinitialized with a smaller disksize between that read and lock\nacquisition, the bound can describe the old table while the scan operates\non the new one. This can lead to out-of-bounds slot accesses.\n\nMove both bound calculations under dev_lock so each bound remains\nconsistent with the table throughout its scan. Keep the fixes separate\nbecause the affected interfaces originate from different commits and can\nbe backported independently.\n\n\nThis patch (of 2):\n\nwriteback_store() calculates the table scan bounds before taking dev_lock.\nA reset followed by reconfiguration with a smaller disksize can therefore\nreplace zram->table while writeback_store() is waiting for the lock. Once\nit acquires the lock, it sees an initialized device but scans the new\ntable using the old upper bound, resulting in an out-of-bounds access.\n\nCalculate the number of pages while holding dev_lock so the scan bound\nmatches the table protected by the lock."}], "id": "CVE-2026-89718", "lastModified": "2026-10-30T13:20:27.450", "metrics": {}, "published": "2026-09-11T20:19:59.377", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/07a82a66f8c1894d92e51d97542c32ebf2c51b09"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d82d60178b02797dbe529e01ac211b26670c49f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/894913e2d35c46ff19a77530907771ae57862b96"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c2745e657f0974871fbc60d46d48c2b04e581330"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef073edd7cfd31aeb90eeab23273102c601f4d8e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f1c5611f699a3aa2a85ebd5fec03dc9bc501e6d0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: zram out-of-bounds access can lead to system instability", "id": "2532376", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532376"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-131", "details": ["A flaw was found in the `zram` component of the Linux kernel. This vulnerability occurs because the `writeback_store()` function calculates table scan bounds before acquiring a necessary lock. If the `zram` device is reinitialized with a smaller disk size during this window, the function may attempt to access memory outside the allocated table, leading to an out-of-bounds access. This can result in system instability or a denial of service."], "name": "CVE-2026-89718", "public_date": "2026-09-11T19:46:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89718\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89718\nhttps://git.kernel.org/stable/c/07a82a66f8c1894d92e51d97542c32ebf2c51b09\nhttps://git.kernel.org/stable/c/894913e2d35c46ff19a77530907771ae57862b96"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a939888ec38bf1f33e4a903056677e92a4844244,07a82a66f8c1894d92e51d97542c32ebf2c51b09)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a939888ec38bf1f33e4a903056677e92a4844244,894913e2d35c46ff19a77530907771ae57862b96)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T09:30:13.016089+00:00", "updated": "2026-09-15T19:30:12.147023+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}