CVE-2026-53256Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind()
- 8.0HighCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 81% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: hold listener socket in rfcomm_connect_ind() rfcomm_get_sock_by_channel() scans rfcomm_sk_list under the list lock, but returns the selected listener after dropping that lock without taking a reference. rfcomm_connect_ind() then locks the listener, queues a child socket on it, and may notify it after unlocking it. The buggy scenario involves two paths, with each column showing the order within that path: rfcomm_connect_ind(): listener close: 1. Find parent in 1. close() enters rfcomm_get_sock_by_channel() rfcomm_sock_release(). 2. Drop rfcomm_sk_list.lock 2. rfcomm_sock_shutdown() without pinning parent. closes the listener. 3. Call lock_sock(parent) and 3. rfcomm_sock_kill() bt_accept_enqueue(parent, unlinks and puts parent. sk, true). 4. Read parent flags and may 4. parent can be freed. call sk_state_change(). If close wins the race, parent can be freed before rfcomm_connect_ind() reaches lock_sock(), bt_accept_enqueue(), or the deferred-setup callback. Take a reference on the listener before leaving rfcomm_sk_list.lock. After lock_sock() succeeds, recheck that it is still in BT_LISTEN before queueing a child, cache the deferred-setup bit while the parent is locked, and drop the reference after the last parent use. KASAN reported a slab-use-after-free in lock_sock_nested() from rfcomm_connect_ind(), with the freeing stack going through rfcomm_sock_kill() and rfcomm_sock_release().
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.0 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.0 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 81% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.0.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f5ec76bdbeb80f75ad0be204371afffee0f8fac8
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < a07d741c077d4e34b16458241a94d29039386553
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 1f73f92f66251065a5f39b09a47cf05ea14d3107
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < de31973ef00e5aa55496f84cf6a44bb157a34e02
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < b0e33e409715c617e2a20f46f99aa5403a14dfda
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8802413ce63175fb522a2bd609fb043a3550c720
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 6f4462d12133106460d7c046b95aad2491e3fddf
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 43c441edacf953b39517a44f5e5e10a93618b226
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.210 – ≤ 5.15.*
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.94 – ≤ 6.12.*
- unaffected 6.18.36 – ≤ 6.18.*
- unaffected 7.0.13 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References9
- https://git.kernel.org/stable/c/f5ec76bdbeb80f75ad0be204371afffee0f8fac8 (opens in a new tab)
- https://git.kernel.org/stable/c/a07d741c077d4e34b16458241a94d29039386553 (opens in a new tab)
- https://git.kernel.org/stable/c/1f73f92f66251065a5f39b09a47cf05ea14d3107 (opens in a new tab)
- https://git.kernel.org/stable/c/de31973ef00e5aa55496f84cf6a44bb157a34e02 (opens in a new tab)
- https://git.kernel.org/stable/c/b0e33e409715c617e2a20f46f99aa5403a14dfda (opens in a new tab)
- https://git.kernel.org/stable/c/8802413ce63175fb522a2bd609fb043a3550c720 (opens in a new tab)
- https://git.kernel.org/stable/c/6f4462d12133106460d7c046b95aad2491e3fddf (opens in a new tab)
- https://git.kernel.org/stable/c/43c441edacf953b39517a44f5e5e10a93618b226 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-39207 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-53256)Record last updated .