CVE-2026-72126: can: isotp: use unconditional synchronize_rcu() in isotp_release()
Vulnerability summary
CVE-2026-72126 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 17 · Related 16Timeline
- 15-08-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: can: isotp: use unconditional synchronize_rcu() in isotp_release() isotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister() and clears so->bound without waiting for a grace period. isotp_release() uses so->bound to decide whether it needs to call synchronize_rcu() before cancelling so->rxtimer, so when NETDEV_UNREGISTER runs first it skips that synchronize_rcu() and can cancel the timer while an in-flight isotp_rcv() is still executing and about to re-arm it via isotp_send_fc(), leading to a use-after-free timer callback on the freed socket. sakisho-bot remarked a problem with rtnl_lock held in isotp_notify(), therefore make isotp_release() always call synchronize_rcu() before cancelling the timers, regardless of so->bound. This still closes the original race (isotp_notify() clearing so->bound without waiting for in-flight isotp_rcv() callers before isotp_release() cancels the RX timer) without adding any RCU wait to the netdevice notifier path.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.17% on 06-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
Linux1 product
- linux≥ 22bfa94db2ef6900c790884fa9461486516626e9, < 945d9894502cd9124f5d676181c542ed2000f7c0 | ≥ 14a4696bc3118ba49da28f79280e1d55603aa737, < 59672aa4bcd8d32172c1ff6a179583981d6acabc | ≥ 14a4696bc3118ba49da28f79280e1d55603aa737, < 15413a082df69175c2f96aeab4c26fe1ff7cff03 | ≥ 14a4696bc3118ba49da28f79280e1d55603aa737, < 6280eda96e0707264849fa7d036fed873c1f8a6d | ≥ 14a4696bc3118ba49da28f79280e1d55603aa737, < cb6abc584a1bfab107ac003d64948a4aef1730aa | ≥ 14a4696bc3118ba49da28f79280e1d55603aa737, < b88a511308779c225005d7994b8744561bdbafbc | ≥ 14a4696bc3118ba49da28f79280e1d55603aa737, < b8278ff605187ef3fa0f2705e93251cce4c4f8ee | ≥ 14a4696bc3118ba49da28f79280e1d55603aa737, < 9b1a02e0d980ac6b0e36a90378f847062f81d7e4 | 80c6ddf771df2ef786f28c1ca5919b3f1080091b | ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f | ≥ 5.10.50, < 5.10.261 | ≥ 5.12.17, < 5.13 | ≥ 5.13.2, < 5.14 | 5.14
3 vendors · 159 products
