CVE-2026-23460 (GCVE-0-2026-23460)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-05-11 22:07
VLAI
Title
net/rose: fix NULL pointer dereference in rose_transmit_link on reconnect
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rose: fix NULL pointer dereference in rose_transmit_link on reconnect syzkaller reported a bug [1], and the reproducer is available at [2]. ROSE sockets use four sk->sk_state values: TCP_CLOSE, TCP_LISTEN, TCP_SYN_SENT, and TCP_ESTABLISHED. rose_connect() already rejects calls for TCP_ESTABLISHED (-EISCONN) and TCP_CLOSE with SS_CONNECTING (-ECONNREFUSED), but lacks a check for TCP_SYN_SENT. When rose_connect() is called a second time while the first connection attempt is still in progress (TCP_SYN_SENT), it overwrites rose->neighbour via rose_get_neigh(). If that returns NULL, the socket is left with rose->state == ROSE_STATE_1 but rose->neighbour == NULL. When the socket is subsequently closed, rose_release() sees ROSE_STATE_1 and calls rose_write_internal() -> rose_transmit_link(skb, NULL), causing a NULL pointer dereference. Per connect(2), a second connect() while a connection is already in progress should return -EALREADY. Add this missing check for TCP_SYN_SENT to complete the state validation in rose_connect(). [1] https://syzkaller.appspot.com/bug?extid=d00f90e0af54102fb271 [2] https://gist.github.com/mrpre/9e6779e0d13e2c66779b1653fef80516
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c85fe6580e86947ca07907ebf4363a73c156fda7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a753844d2a8136f090123c8fb1ff6c7f6ee7c2b3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c2ab74c12932e52cfa1e7e4582d42b0c8bec96c7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0c9fb70a206a8734e10468ecc24d57c7596cf64e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 508f49ccbe0329641bb681f7d0052bb4e5943252 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0c3e8bff808f17ad37a51d8e719eed22c7863120 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a12254050e3050f1011cd24f3b880a6882d0139d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e1f0a18c9564cdb16523c802e2c6fe5874e3d944 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rose: fix NULL pointer dereference in rose_transmit_link on reconnect\n\nsyzkaller reported a bug [1], and the reproducer is available at [2].\n\nROSE sockets use four sk-\u003esk_state values: TCP_CLOSE, TCP_LISTEN,\nTCP_SYN_SENT, and TCP_ESTABLISHED. rose_connect() already rejects\ncalls for TCP_ESTABLISHED (-EISCONN) and TCP_CLOSE with SS_CONNECTING\n(-ECONNREFUSED), but lacks a check for TCP_SYN_SENT.\n\nWhen rose_connect() is called a second time while the first connection\nattempt is still in progress (TCP_SYN_SENT), it overwrites\nrose-\u003eneighbour via rose_get_neigh(). If that returns NULL, the socket\nis left with rose-\u003estate == ROSE_STATE_1 but rose-\u003eneighbour == NULL.\nWhen the socket is subsequently closed, rose_release() sees\nROSE_STATE_1 and calls rose_write_internal() -\u003e\nrose_transmit_link(skb, NULL), causing a NULL pointer dereference.\n\nPer connect(2), a second connect() while a connection is already in\nprogress should return -EALREADY. Add this missing check for\nTCP_SYN_SENT to complete the state validation in rose_connect().\n\n[1] https://syzkaller.appspot.com/bug?extid=d00f90e0af54102fb271\n[2] https://gist.github.com/mrpre/9e6779e0d13e2c66779b1653fef80516"
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    "dateReserved": "2026-01-13T15:37:46.021Z",
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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