{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-72121", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-72121", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-08-15T05:52:59.959Z", "updatedAt": "2026-10-16T18:44:57.290Z", "importedAt": "2026-10-24T01:58:25.636Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "can: bcm: add locking when updating filter and timer values", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: add locking when updating filter and timer values\n\nKCSAN detected a simultaneous access to timer values that can be\noverwritten in bcm_rx_setup() when updating timer and filter content\nwhile bcm_rx_handler(), bcm_rx_timeout_handler() or bcm_rx_thr_handler()\nrun concurrently on incoming CAN traffic.\n\nProtect the timer (ival1/ival2/kt_ival1/kt_ival2/kt_lastmsg) and filter\n(nframes/flags/frames/last_frames) updates in bcm_rx_setup() with a new\nper-op bcm_rx_update_lock, taken with the matching scope in the RX\nhandlers. memcpy_from_msg() is staged into a temporary buffer before the\nlock is taken, since it can sleep and must not run under a spinlock.\n\nhrtimer_cancel() is always called without bcm_rx_update_lock held, since\nbcm_rx_timeout_handler()/bcm_rx_thr_handler() take the same lock and a\nrunning callback would otherwise deadlock against the canceller.\n\nAlso close a related race: bcm_rx_setup() cleared the RTR flag in the\nstored reply frame's can_id as a separate, unprotected step after the\nframe content was already installed, so a concurrent bcm_rx_handler()\ncould transmit a stale reply with CAN_RTR_FLAG still set. Fold that\nnormalization into the initial frame preparation instead (on the staged\nbuffer for updates, directly on op->frames pre-registration for new\nops), so the installed frame is always atomically self-consistent.\n\nbcm_rx_handler()'s RX_RTR_FRAME check now takes a lock-protected\nsnapshot of op->flags before deciding whether to call bcm_can_tx(),\nbut does not hold the lock across that call.\n\nAlso take a lock-protected snapshot of the currframe in bcm_can_tx()\nto avoid partly overwrites by content updates in bcm_tx_setup().\nFinally check if a TX_RESET_MULTI_IDX/SETTIMER might have reset\nop->currframe between the two locked sections in bcm_can_tx().\n\nOmit calling hrtimer_forward() with zero interval in bcm_rx_thr_handler().\nkt_ival2 may have been concurrently cleared by bcm_rx_setup() before it\ncancels this timer, so check kt_ival2 inside the bcm_rx_update_lock.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "7595de7bc56e0e52b74e56c90f7e247bf626d628", "status": "affected", "versionType": "git", "lessThan": "96994180bd7b248b0cc698afe926e23fc1bda59b" }, { "version": "fbd8fdc2b218e979cfe422b139b8f74c12419d1f", "status": "affected", "versionType": "git", "lessThan": "caa8704a7f3cb7806331596195385437126ecb3a" }, { "version": "2a437b86ac5a9893c902f30ef66815bf13587bf6", "status": "affected", "versionType": "git", "lessThan": "a7c369e7da8203e2b5be12bbcac7b9ab2ed5b658" }, { "version": "76c84c3728178b2d38d5604e399dfe8b0752645e", "status": "affected", "versionType": "git", "lessThan": "a7eb6db1cd3f7b556a301dc1265945ad112089f7" }, { "version": "cc55dd28c20a6611e30596019b3b2f636819a4c0", "status": "affected", "versionType": "git", "lessThan": "834cbca3b12e46887f7a9b35f1981a888360ea4c" }, { "version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7", "status": "affected", "versionType": "git", "lessThan": "19b1994069dd29478ba767de1f98f14a088198dc" }, { "version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7", "status": "affected", "versionType": "git", "lessThan": "fc9f5ee1b073bd233d9c604e338af4ebb42cbc33" }, { "version": "c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7", "status": "affected", "versionType": "git", "lessThan": "749179c2e25b95d22499ed29096b3e02d6dfd2b4" }, { "version": "8f1c022541bf5a923c8d6fa483112c15250f30a4", "status": "affected", "versionType": "git" }, { "version": "c4e8a172501e677ebd8ea9d9161d97dc4df56fbd", "status": "affected", "versionType": "git" }, { "version": "5.10.238", "status": "affected", "versionType": "semver", "lessThan": "5.10.265" }, { "version": "5.15.185", "status": "affected", "versionType": "semver", "lessThan": "5.15.216" }, { "version": "6.1.141", "status": "affected", "versionType": "semver", "lessThan": "6.1.183" }, { "version": "6.6.93", "status": "affected", "versionType": "semver", "lessThan": "6.6.148" }, { "version": "6.12.31", "status": "affected", "versionType": "semver", "lessThan": "6.12.101" }, { "version": "5.4.294", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "6.14.9", "status": "affected", "versionType": "semver", "lessThan": "6.15" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.15" }, { "version": "5.10.265", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.216", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.183", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.148", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.101", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.42", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }